| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20140403224743.GB13987@kroah.com>
Date: Thu, 3 Apr 2014 15:47:43 -0700
From: Greg KH <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
torvalds@...ux-foundation.org, stable@...r.kernel.org
Cc: lwn@....net, Jiri Slaby <jslaby@...e.cz>
Subject: Re: Linux 3.13.9
diff --git a/Makefile b/Makefile
index 4cab13b605c1..652f97296a40 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
VERSION = 3
PATCHLEVEL = 13
-SUBLEVEL = 8
+SUBLEVEL = 9
EXTRAVERSION =
NAME = One Giant Leap for Frogkind
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 5ad38ad07890..bbc8b12fa443 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -445,20 +445,10 @@ static inline int pte_same(pte_t a, pte_t b)
return a.pte == b.pte;
}
-static inline int pteval_present(pteval_t pteval)
-{
- /*
- * Yes Linus, _PAGE_PROTNONE == _PAGE_NUMA. Expressing it this
- * way clearly states that the intent is that protnone and numa
- * hinting ptes are considered present for the purposes of
- * pagetable operations like zapping, protection changes, gup etc.
- */
- return pteval & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_NUMA);
-}
-
static inline int pte_present(pte_t a)
{
- return pteval_present(pte_flags(a));
+ return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE |
+ _PAGE_NUMA);
}
#define pte_accessible pte_accessible
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index d35f24e231cd..1306d117967d 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -119,9 +119,10 @@ static inline void setup_node_to_cpumask_map(void) { }
extern const struct cpumask *cpu_coregroup_mask(int cpu);
-#ifdef ENABLE_TOPO_DEFINES
#define topology_physical_package_id(cpu) (cpu_data(cpu).phys_proc_id)
#define topology_core_id(cpu) (cpu_data(cpu).cpu_core_id)
+
+#ifdef ENABLE_TOPO_DEFINES
#define topology_core_cpumask(cpu) (per_cpu(cpu_core_map, cpu))
#define topology_thread_cpumask(cpu) (per_cpu(cpu_sibling_map, cpu))
#endif
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 3c76c3d50471..ce563be09cc1 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -365,7 +365,7 @@ void xen_ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
/* Assume pteval_t is equivalent to all the other *val_t types. */
static pteval_t pte_mfn_to_pfn(pteval_t val)
{
- if (pteval_present(val)) {
+ if (val & _PAGE_PRESENT) {
unsigned long mfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
unsigned long pfn = mfn_to_pfn(mfn);
@@ -381,7 +381,7 @@ static pteval_t pte_mfn_to_pfn(pteval_t val)
static pteval_t pte_pfn_to_mfn(pteval_t val)
{
- if (pteval_present(val)) {
+ if (val & _PAGE_PRESENT) {
unsigned long pfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
pteval_t flags = val & PTE_FLAGS_MASK;
unsigned long mfn;
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index d2515435e23f..8fb295350efb 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -905,7 +905,7 @@ bio_pageinc(struct bio *bio)
/* Non-zero page count for non-head members of
* compound pages is no longer allowed by the kernel.
*/
- page = compound_trans_head(bv->bv_page);
+ page = compound_head(bv->bv_page);
atomic_inc(&page->_count);
}
}
@@ -918,7 +918,7 @@ bio_pagedec(struct bio *bio)
int i;
bio_for_each_segment(bv, bio, i) {
- page = compound_trans_head(bv->bv_page);
+ page = compound_head(bv->bv_page);
atomic_dec(&page->_count);
}
}
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index d3c3b5b15824..e79720d5ceff 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -828,7 +828,7 @@ void i915_gem_suspend_gtt_mappings(struct drm_device *dev)
dev_priv->gtt.base.clear_range(&dev_priv->gtt.base,
dev_priv->gtt.base.start / PAGE_SIZE,
dev_priv->gtt.base.total / PAGE_SIZE,
- false);
+ true);
}
void i915_gem_restore_gtt_mappings(struct drm_device *dev)
diff --git a/drivers/i2c/busses/i2c-cpm.c b/drivers/i2c/busses/i2c-cpm.c
index 3e5ea2c87a6e..886778a60d35 100644
--- a/drivers/i2c/busses/i2c-cpm.c
+++ b/drivers/i2c/busses/i2c-cpm.c
@@ -40,7 +40,9 @@
#include <linux/i2c.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
+#include <linux/of_address.h>
#include <linux/of_device.h>
+#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <sysdev/fsl_soc.h>
#include <asm/cpm.h>
diff --git a/drivers/input/mouse/cypress_ps2.c b/drivers/input/mouse/cypress_ps2.c
index a5869a856ea5..bba656a3336e 100644
--- a/drivers/input/mouse/cypress_ps2.c
+++ b/drivers/input/mouse/cypress_ps2.c
@@ -410,7 +410,6 @@ static int cypress_set_input_params(struct input_dev *input,
__clear_bit(REL_X, input->relbit);
__clear_bit(REL_Y, input->relbit);
- __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
__set_bit(EV_KEY, input->evbit);
__set_bit(BTN_LEFT, input->keybit);
__set_bit(BTN_RIGHT, input->keybit);
diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 26386f9d2569..d8d49d10f9bb 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -265,11 +265,22 @@ static int synaptics_identify(struct psmouse *psmouse)
* Read touchpad resolution and maximum reported coordinates
* Resolution is left zero if touchpad does not support the query
*/
+
+static const int *quirk_min_max;
+
static int synaptics_resolution(struct psmouse *psmouse)
{
struct synaptics_data *priv = psmouse->private;
unsigned char resp[3];
+ if (quirk_min_max) {
+ priv->x_min = quirk_min_max[0];
+ priv->x_max = quirk_min_max[1];
+ priv->y_min = quirk_min_max[2];
+ priv->y_max = quirk_min_max[3];
+ return 0;
+ }
+
if (SYN_ID_MAJOR(priv->identity) < 4)
return 0;
@@ -1485,10 +1496,54 @@ static const struct dmi_system_id olpc_dmi_table[] __initconst = {
{ }
};
+static const struct dmi_system_id min_max_dmi_table[] __initconst = {
+#if defined(CONFIG_DMI)
+ {
+ /* Lenovo ThinkPad Helix */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
+ },
+ .driver_data = (int []){1024, 5052, 2258, 4832},
+ },
+ {
+ /* Lenovo ThinkPad X240 */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X240"),
+ },
+ .driver_data = (int []){1232, 5710, 1156, 4696},
+ },
+ {
+ /* Lenovo ThinkPad T440s */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T440"),
+ },
+ .driver_data = (int []){1024, 5112, 2024, 4832},
+ },
+ {
+ /* Lenovo ThinkPad T540p */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T540"),
+ },
+ .driver_data = (int []){1024, 5056, 2058, 4832},
+ },
+#endif
+ { }
+};
+
void __init synaptics_module_init(void)
{
+ const struct dmi_system_id *min_max_dmi;
+
impaired_toshiba_kbc = dmi_check_system(toshiba_dmi_table);
broken_olpc_ec = dmi_check_system(olpc_dmi_table);
+
+ min_max_dmi = dmi_first_match(min_max_dmi_table);
+ if (min_max_dmi)
+ quirk_min_max = min_max_dmi->driver_data;
}
static int __synaptics_init(struct psmouse *psmouse, bool absolute_mode)
diff --git a/drivers/input/mousedev.c b/drivers/input/mousedev.c
index 4c842c320c2e..b604564dec5c 100644
--- a/drivers/input/mousedev.c
+++ b/drivers/input/mousedev.c
@@ -67,7 +67,6 @@ struct mousedev {
struct device dev;
struct cdev cdev;
bool exist;
- bool is_mixdev;
struct list_head mixdev_node;
bool opened_by_mixdev;
@@ -77,6 +76,9 @@ struct mousedev {
int old_x[4], old_y[4];
int frac_dx, frac_dy;
unsigned long touch;
+
+ int (*open_device)(struct mousedev *mousedev);
+ void (*close_device)(struct mousedev *mousedev);
};
enum mousedev_emul {
@@ -116,9 +118,6 @@ static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
static struct mousedev *mousedev_mix;
static LIST_HEAD(mousedev_mix_list);
-static void mixdev_open_devices(void);
-static void mixdev_close_devices(void);
-
#define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
#define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
@@ -428,9 +427,7 @@ static int mousedev_open_device(struct mousedev *mousedev)
if (retval)
return retval;
- if (mousedev->is_mixdev)
- mixdev_open_devices();
- else if (!mousedev->exist)
+ if (!mousedev->exist)
retval = -ENODEV;
else if (!mousedev->open++) {
retval = input_open_device(&mousedev->handle);
@@ -446,9 +443,7 @@ static void mousedev_close_device(struct mousedev *mousedev)
{
mutex_lock(&mousedev->mutex);
- if (mousedev->is_mixdev)
- mixdev_close_devices();
- else if (mousedev->exist && !--mousedev->open)
+ if (mousedev->exist && !--mousedev->open)
input_close_device(&mousedev->handle);
mutex_unlock(&mousedev->mutex);
@@ -459,21 +454,29 @@ static void mousedev_close_device(struct mousedev *mousedev)
* stream. Note that this function is called with mousedev_mix->mutex
* held.
*/
-static void mixdev_open_devices(void)
+static int mixdev_open_devices(struct mousedev *mixdev)
{
- struct mousedev *mousedev;
+ int error;
+
+ error = mutex_lock_interruptible(&mixdev->mutex);
+ if (error)
+ return error;
- if (mousedev_mix->open++)
- return;
+ if (!mixdev->open++) {
+ struct mousedev *mousedev;
- list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
- if (!mousedev->opened_by_mixdev) {
- if (mousedev_open_device(mousedev))
- continue;
+ list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
+ if (!mousedev->opened_by_mixdev) {
+ if (mousedev_open_device(mousedev))
+ continue;
- mousedev->opened_by_mixdev = true;
+ mousedev->opened_by_mixdev = true;
+ }
}
}
+
+ mutex_unlock(&mixdev->mutex);
+ return 0;
}
/*
@@ -481,19 +484,22 @@ static void mixdev_open_devices(void)
* device. Note that this function is called with mousedev_mix->mutex
* held.
*/
-static void mixdev_close_devices(void)
+static void mixdev_close_devices(struct mousedev *mixdev)
{
- struct mousedev *mousedev;
+ mutex_lock(&mixdev->mutex);
- if (--mousedev_mix->open)
- return;
+ if (!--mixdev->open) {
+ struct mousedev *mousedev;
- list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
- if (mousedev->opened_by_mixdev) {
- mousedev->opened_by_mixdev = false;
- mousedev_close_device(mousedev);
+ list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
+ if (mousedev->opened_by_mixdev) {
+ mousedev->opened_by_mixdev = false;
+ mousedev_close_device(mousedev);
+ }
}
}
+
+ mutex_unlock(&mixdev->mutex);
}
@@ -522,7 +528,7 @@ static int mousedev_release(struct inode *inode, struct file *file)
mousedev_detach_client(mousedev, client);
kfree(client);
- mousedev_close_device(mousedev);
+ mousedev->close_device(mousedev);
return 0;
}
@@ -550,7 +556,7 @@ static int mousedev_open(struct inode *inode, struct file *file)
client->mousedev = mousedev;
mousedev_attach_client(mousedev, client);
- error = mousedev_open_device(mousedev);
+ error = mousedev->open_device(mousedev);
if (error)
goto err_free_client;
@@ -861,16 +867,21 @@ static struct mousedev *mousedev_create(struct input_dev *dev,
if (mixdev) {
dev_set_name(&mousedev->dev, "mice");
+
+ mousedev->open_device = mixdev_open_devices;
+ mousedev->close_device = mixdev_close_devices;
} else {
int dev_no = minor;
/* Normalize device number if it falls into legacy range */
if (dev_no < MOUSEDEV_MINOR_BASE + MOUSEDEV_MINORS)
dev_no -= MOUSEDEV_MINOR_BASE;
dev_set_name(&mousedev->dev, "mouse%d", dev_no);
+
+ mousedev->open_device = mousedev_open_device;
+ mousedev->close_device = mousedev_close_device;
}
mousedev->exist = true;
- mousedev->is_mixdev = mixdev;
mousedev->handle.dev = input_get_device(dev);
mousedev->handle.name = dev_name(&mousedev->dev);
mousedev->handle.handler = handler;
@@ -919,7 +930,7 @@ static void mousedev_destroy(struct mousedev *mousedev)
device_del(&mousedev->dev);
mousedev_cleanup(mousedev);
input_free_minor(MINOR(mousedev->dev.devt));
- if (!mousedev->is_mixdev)
+ if (mousedev != mousedev_mix)
input_unregister_handle(&mousedev->handle);
put_device(&mousedev->dev);
}
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index df75a2302740..bb2021e48344 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -88,8 +88,9 @@
#define MVNETA_TX_IN_PRGRS BIT(1)
#define MVNETA_TX_FIFO_EMPTY BIT(8)
#define MVNETA_RX_MIN_FRAME_SIZE 0x247c
-#define MVNETA_SGMII_SERDES_CFG 0x24A0
+#define MVNETA_SERDES_CFG 0x24A0
#define MVNETA_SGMII_SERDES_PROTO 0x0cc7
+#define MVNETA_RGMII_SERDES_PROTO 0x0667
#define MVNETA_TYPE_PRIO 0x24bc
#define MVNETA_FORCE_UNI BIT(21)
#define MVNETA_TXQ_CMD_1 0x24e4
@@ -161,7 +162,7 @@
#define MVNETA_GMAC_MAX_RX_SIZE_MASK 0x7ffc
#define MVNETA_GMAC0_PORT_ENABLE BIT(0)
#define MVNETA_GMAC_CTRL_2 0x2c08
-#define MVNETA_GMAC2_PSC_ENABLE BIT(3)
+#define MVNETA_GMAC2_PCS_ENABLE BIT(3)
#define MVNETA_GMAC2_PORT_RGMII BIT(4)
#define MVNETA_GMAC2_PORT_RESET BIT(6)
#define MVNETA_GMAC_STATUS 0x2c10
@@ -706,35 +707,6 @@ static void mvneta_rxq_bm_disable(struct mvneta_port *pp,
mvreg_write(pp, MVNETA_RXQ_CONFIG_REG(rxq->id), val);
}
-
-
-/* Sets the RGMII Enable bit (RGMIIEn) in port MAC control register */
-static void mvneta_gmac_rgmii_set(struct mvneta_port *pp, int enable)
-{
- u32 val;
-
- val = mvreg_read(pp, MVNETA_GMAC_CTRL_2);
-
- if (enable)
- val |= MVNETA_GMAC2_PORT_RGMII;
- else
- val &= ~MVNETA_GMAC2_PORT_RGMII;
-
- mvreg_write(pp, MVNETA_GMAC_CTRL_2, val);
-}
-
-/* Config SGMII port */
-static void mvneta_port_sgmii_config(struct mvneta_port *pp)
-{
- u32 val;
-
- val = mvreg_read(pp, MVNETA_GMAC_CTRL_2);
- val |= MVNETA_GMAC2_PSC_ENABLE;
- mvreg_write(pp, MVNETA_GMAC_CTRL_2, val);
-
- mvreg_write(pp, MVNETA_SGMII_SERDES_CFG, MVNETA_SGMII_SERDES_PROTO);
-}
-
/* Start the Ethernet port RX and TX activity */
static void mvneta_port_up(struct mvneta_port *pp)
{
@@ -2729,12 +2701,15 @@ static void mvneta_port_power_up(struct mvneta_port *pp, int phy_mode)
mvreg_write(pp, MVNETA_UNIT_INTR_CAUSE, 0);
if (phy_mode == PHY_INTERFACE_MODE_SGMII)
- mvneta_port_sgmii_config(pp);
+ mvreg_write(pp, MVNETA_SERDES_CFG, MVNETA_SGMII_SERDES_PROTO);
+ else
+ mvreg_write(pp, MVNETA_SERDES_CFG, MVNETA_RGMII_SERDES_PROTO);
- mvneta_gmac_rgmii_set(pp, 1);
+ val = mvreg_read(pp, MVNETA_GMAC_CTRL_2);
+
+ val |= MVNETA_GMAC2_PCS_ENABLE | MVNETA_GMAC2_PORT_RGMII;
/* Cancel Port Reset */
- val = mvreg_read(pp, MVNETA_GMAC_CTRL_2);
val &= ~MVNETA_GMAC2_PORT_RESET;
mvreg_write(pp, MVNETA_GMAC_CTRL_2, val);
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 4fb7a8f83c8a..54af4e933695 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -186,12 +186,12 @@ static bool is_invalid_reserved_pfn(unsigned long pfn)
if (pfn_valid(pfn)) {
bool reserved;
struct page *tail = pfn_to_page(pfn);
- struct page *head = compound_trans_head(tail);
+ struct page *head = compound_head(tail);
reserved = !!(PageReserved(head));
if (head != tail) {
/*
* "head" is not a dangling pointer
- * (compound_trans_head takes care of that)
+ * (compound_head takes care of that)
* but the hugepage may have been split
* from under us (and we may not hold a
* reference count on the head page so it can
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 4c02e2b94103..2c85267668fc 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -406,11 +406,25 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
state = BP_EAGAIN;
break;
}
+ scrub_page(page);
- pfn = page_to_pfn(page);
- frame_list[i] = pfn_to_mfn(pfn);
+ frame_list[i] = page_to_pfn(page);
+ }
- scrub_page(page);
+ /*
+ * Ensure that ballooned highmem pages don't have kmaps.
+ *
+ * Do this before changing the p2m as kmap_flush_unused()
+ * reads PTEs to obtain pages (and hence needs the original
+ * p2m entry).
+ */
+ kmap_flush_unused();
+
+ /* Update direct mapping, invalidate P2M, and add to balloon. */
+ for (i = 0; i < nr_pages; i++) {
+ pfn = frame_list[i];
+ frame_list[i] = pfn_to_mfn(pfn);
+ page = pfn_to_page(pfn);
#ifdef CONFIG_XEN_HAVE_PVMMU
/*
@@ -436,11 +450,9 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
}
#endif
- balloon_append(pfn_to_page(pfn));
+ balloon_append(page);
}
- /* Ensure that ballooned highmem pages don't have kmaps. */
- kmap_flush_unused();
flush_tlb_all();
set_xen_guest_handle(reservation.extent_start, frame_list);
diff --git a/fs/dcache.c b/fs/dcache.c
index fdbe23027810..f7ad6d71b1c1 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2833,9 +2833,9 @@ static int prepend_name(char **buffer, int *buflen, struct qstr *name)
u32 dlen = ACCESS_ONCE(name->len);
char *p;
- if (*buflen < dlen + 1)
- return -ENAMETOOLONG;
*buflen -= dlen + 1;
+ if (*buflen < 0)
+ return -ENAMETOOLONG;
p = *buffer -= dlen + 1;
*p++ = '/';
while (dlen--) {
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 31fa964742bc..3617e33257a3 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -38,6 +38,7 @@
#include <linux/slab.h>
#include <linux/ratelimit.h>
#include <linux/aio.h>
+#include <linux/bitops.h>
#include "ext4_jbd2.h"
#include "xattr.h"
@@ -3926,18 +3927,20 @@ int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc)
void ext4_set_inode_flags(struct inode *inode)
{
unsigned int flags = EXT4_I(inode)->i_flags;
+ unsigned int new_fl = 0;
- inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
if (flags & EXT4_SYNC_FL)
- inode->i_flags |= S_SYNC;
+ new_fl |= S_SYNC;
if (flags & EXT4_APPEND_FL)
- inode->i_flags |= S_APPEND;
+ new_fl |= S_APPEND;
if (flags & EXT4_IMMUTABLE_FL)
- inode->i_flags |= S_IMMUTABLE;
+ new_fl |= S_IMMUTABLE;
if (flags & EXT4_NOATIME_FL)
- inode->i_flags |= S_NOATIME;
+ new_fl |= S_NOATIME;
if (flags & EXT4_DIRSYNC_FL)
- inode->i_flags |= S_DIRSYNC;
+ new_fl |= S_DIRSYNC;
+ set_mask_bits(&inode->i_flags,
+ S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC, new_fl);
}
/* Propagate flags from i_flags to EXT4_I(inode)->i_flags */
diff --git a/fs/mount.h b/fs/mount.h
index a17458ca6f29..b29e42f05f34 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -19,13 +19,13 @@ struct mnt_pcp {
};
struct mountpoint {
- struct list_head m_hash;
+ struct hlist_node m_hash;
struct dentry *m_dentry;
int m_count;
};
struct mount {
- struct list_head mnt_hash;
+ struct hlist_node mnt_hash;
struct mount *mnt_parent;
struct dentry *mnt_mountpoint;
struct vfsmount mnt;
diff --git a/fs/namei.c b/fs/namei.c
index cfe660870251..399f6378de54 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1098,7 +1098,7 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
return false;
if (!d_mountpoint(path->dentry))
- break;
+ return true;
mounted = __lookup_mnt(path->mnt, path->dentry);
if (!mounted)
@@ -1114,20 +1114,7 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
*/
*inode = path->dentry->d_inode;
}
- return true;
-}
-
-static void follow_mount_rcu(struct nameidata *nd)
-{
- while (d_mountpoint(nd->path.dentry)) {
- struct mount *mounted;
- mounted = __lookup_mnt(nd->path.mnt, nd->path.dentry);
- if (!mounted)
- break;
- nd->path.mnt = &mounted->mnt;
- nd->path.dentry = mounted->mnt.mnt_root;
- nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
- }
+ return read_seqretry(&mount_lock, nd->m_seq);
}
static int follow_dotdot_rcu(struct nameidata *nd)
@@ -1155,7 +1142,17 @@ static int follow_dotdot_rcu(struct nameidata *nd)
break;
nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
}
- follow_mount_rcu(nd);
+ while (d_mountpoint(nd->path.dentry)) {
+ struct mount *mounted;
+ mounted = __lookup_mnt(nd->path.mnt, nd->path.dentry);
+ if (!mounted)
+ break;
+ nd->path.mnt = &mounted->mnt;
+ nd->path.dentry = mounted->mnt.mnt_root;
+ nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
+ if (!read_seqretry(&mount_lock, nd->m_seq))
+ goto failed;
+ }
nd->inode = nd->path.dentry->d_inode;
return 0;
diff --git a/fs/namespace.c b/fs/namespace.c
index be32ebccdeb1..6d0e54e27d33 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -23,11 +23,34 @@
#include <linux/uaccess.h>
#include <linux/proc_ns.h>
#include <linux/magic.h>
+#include <linux/bootmem.h>
#include "pnode.h"
#include "internal.h"
-#define HASH_SHIFT ilog2(PAGE_SIZE / sizeof(struct list_head))
-#define HASH_SIZE (1UL << HASH_SHIFT)
+static unsigned int m_hash_mask __read_mostly;
+static unsigned int m_hash_shift __read_mostly;
+static unsigned int mp_hash_mask __read_mostly;
+static unsigned int mp_hash_shift __read_mostly;
+
+static __initdata unsigned long mhash_entries;
+static int __init set_mhash_entries(char *str)
+{
+ if (!str)
+ return 0;
+ mhash_entries = simple_strtoul(str, &str, 0);
+ return 1;
+}
+__setup("mhash_entries=", set_mhash_entries);
+
+static __initdata unsigned long mphash_entries;
+static int __init set_mphash_entries(char *str)
+{
+ if (!str)
+ return 0;
+ mphash_entries = simple_strtoul(str, &str, 0);
+ return 1;
+}
+__setup("mphash_entries=", set_mphash_entries);
static int event;
static DEFINE_IDA(mnt_id_ida);
@@ -36,8 +59,8 @@ static DEFINE_SPINLOCK(mnt_id_lock);
static int mnt_id_start = 0;
static int mnt_group_start = 1;
-static struct list_head *mount_hashtable __read_mostly;
-static struct list_head *mountpoint_hashtable __read_mostly;
+static struct hlist_head *mount_hashtable __read_mostly;
+static struct hlist_head *mountpoint_hashtable __read_mostly;
static struct kmem_cache *mnt_cache __read_mostly;
static DECLARE_RWSEM(namespace_sem);
@@ -55,12 +78,19 @@ EXPORT_SYMBOL_GPL(fs_kobj);
*/
__cacheline_aligned_in_smp DEFINE_SEQLOCK(mount_lock);
-static inline unsigned long hash(struct vfsmount *mnt, struct dentry *dentry)
+static inline struct hlist_head *m_hash(struct vfsmount *mnt, struct dentry *dentry)
{
unsigned long tmp = ((unsigned long)mnt / L1_CACHE_BYTES);
tmp += ((unsigned long)dentry / L1_CACHE_BYTES);
- tmp = tmp + (tmp >> HASH_SHIFT);
- return tmp & (HASH_SIZE - 1);
+ tmp = tmp + (tmp >> m_hash_shift);
+ return &mount_hashtable[tmp & m_hash_mask];
+}
+
+static inline struct hlist_head *mp_hash(struct dentry *dentry)
+{
+ unsigned long tmp = ((unsigned long)dentry / L1_CACHE_BYTES);
+ tmp = tmp + (tmp >> mp_hash_shift);
+ return &mountpoint_hashtable[tmp & mp_hash_mask];
}
/*
@@ -187,7 +217,7 @@ static struct mount *alloc_vfsmnt(const char *name)
mnt->mnt_writers = 0;
#endif
- INIT_LIST_HEAD(&mnt->mnt_hash);
+ INIT_HLIST_NODE(&mnt->mnt_hash);
INIT_LIST_HEAD(&mnt->mnt_child);
INIT_LIST_HEAD(&mnt->mnt_mounts);
INIT_LIST_HEAD(&mnt->mnt_list);
@@ -575,10 +605,10 @@ bool legitimize_mnt(struct vfsmount *bastard, unsigned seq)
*/
struct mount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry)
{
- struct list_head *head = mount_hashtable + hash(mnt, dentry);
+ struct hlist_head *head = m_hash(mnt, dentry);
struct mount *p;
- list_for_each_entry_rcu(p, head, mnt_hash)
+ hlist_for_each_entry_rcu(p, head, mnt_hash)
if (&p->mnt_parent->mnt == mnt && p->mnt_mountpoint == dentry)
return p;
return NULL;
@@ -590,13 +620,17 @@ struct mount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry)
*/
struct mount *__lookup_mnt_last(struct vfsmount *mnt, struct dentry *dentry)
{
- struct list_head *head = mount_hashtable + hash(mnt, dentry);
- struct mount *p;
-
- list_for_each_entry_reverse(p, head, mnt_hash)
- if (&p->mnt_parent->mnt == mnt && p->mnt_mountpoint == dentry)
- return p;
- return NULL;
+ struct mount *p, *res;
+ res = p = __lookup_mnt(mnt, dentry);
+ if (!p)
+ goto out;
+ hlist_for_each_entry_continue(p, mnt_hash) {
+ if (&p->mnt_parent->mnt != mnt || p->mnt_mountpoint != dentry)
+ break;
+ res = p;
+ }
+out:
+ return res;
}
/*
@@ -633,11 +667,11 @@ struct vfsmount *lookup_mnt(struct path *path)
static struct mountpoint *new_mountpoint(struct dentry *dentry)
{
- struct list_head *chain = mountpoint_hashtable + hash(NULL, dentry);
+ struct hlist_head *chain = mp_hash(dentry);
struct mountpoint *mp;
int ret;
- list_for_each_entry(mp, chain, m_hash) {
+ hlist_for_each_entry(mp, chain, m_hash) {
if (mp->m_dentry == dentry) {
/* might be worth a WARN_ON() */
if (d_unlinked(dentry))
@@ -659,7 +693,7 @@ static struct mountpoint *new_mountpoint(struct dentry *dentry)
mp->m_dentry = dentry;
mp->m_count = 1;
- list_add(&mp->m_hash, chain);
+ hlist_add_head(&mp->m_hash, chain);
return mp;
}
@@ -670,7 +704,7 @@ static void put_mountpoint(struct mountpoint *mp)
spin_lock(&dentry->d_lock);
dentry->d_flags &= ~DCACHE_MOUNTED;
spin_unlock(&dentry->d_lock);
- list_del(&mp->m_hash);
+ hlist_del(&mp->m_hash);
kfree(mp);
}
}
@@ -712,7 +746,7 @@ static void detach_mnt(struct mount *mnt, struct path *old_path)
mnt->mnt_parent = mnt;
mnt->mnt_mountpoint = mnt->mnt.mnt_root;
list_del_init(&mnt->mnt_child);
- list_del_init(&mnt->mnt_hash);
+ hlist_del_init_rcu(&mnt->mnt_hash);
put_mountpoint(mnt->mnt_mp);
mnt->mnt_mp = NULL;
}
@@ -739,15 +773,14 @@ static void attach_mnt(struct mount *mnt,
struct mountpoint *mp)
{
mnt_set_mountpoint(parent, mp, mnt);
- list_add_tail(&mnt->mnt_hash, mount_hashtable +
- hash(&parent->mnt, mp->m_dentry));
+ hlist_add_head_rcu(&mnt->mnt_hash, m_hash(&parent->mnt, mp->m_dentry));
list_add_tail(&mnt->mnt_child, &parent->mnt_mounts);
}
/*
* vfsmount lock must be held for write
*/
-static void commit_tree(struct mount *mnt)
+static void commit_tree(struct mount *mnt, struct mount *shadows)
{
struct mount *parent = mnt->mnt_parent;
struct mount *m;
@@ -762,8 +795,11 @@ static void commit_tree(struct mount *mnt)
list_splice(&head, n->list.prev);
- list_add_tail(&mnt->mnt_hash, mount_hashtable +
- hash(&parent->mnt, mnt->mnt_mountpoint));
+ if (shadows)
+ hlist_add_after_rcu(&shadows->mnt_hash, &mnt->mnt_hash);
+ else
+ hlist_add_head_rcu(&mnt->mnt_hash,
+ m_hash(&parent->mnt, mnt->mnt_mountpoint));
list_add_tail(&mnt->mnt_child, &parent->mnt_mounts);
touch_mnt_namespace(n);
}
@@ -1153,26 +1189,28 @@ int may_umount(struct vfsmount *mnt)
EXPORT_SYMBOL(may_umount);
-static LIST_HEAD(unmounted); /* protected by namespace_sem */
+static HLIST_HEAD(unmounted); /* protected by namespace_sem */
static void namespace_unlock(void)
{
struct mount *mnt;
- LIST_HEAD(head);
+ struct hlist_head head = unmounted;
- if (likely(list_empty(&unmounted))) {
+ if (likely(hlist_empty(&head))) {
up_write(&namespace_sem);
return;
}
- list_splice_init(&unmounted, &head);
+ head.first->pprev = &head.first;
+ INIT_HLIST_HEAD(&unmounted);
+
up_write(&namespace_sem);
synchronize_rcu();
- while (!list_empty(&head)) {
- mnt = list_first_entry(&head, struct mount, mnt_hash);
- list_del_init(&mnt->mnt_hash);
+ while (!hlist_empty(&head)) {
+ mnt = hlist_entry(head.first, struct mount, mnt_hash);
+ hlist_del_init(&mnt->mnt_hash);
if (mnt->mnt_ex_mountpoint.mnt)
path_put(&mnt->mnt_ex_mountpoint);
mntput(&mnt->mnt);
@@ -1193,16 +1231,19 @@ static inline void namespace_lock(void)
*/
void umount_tree(struct mount *mnt, int how)
{
- LIST_HEAD(tmp_list);
+ HLIST_HEAD(tmp_list);
struct mount *p;
+ struct mount *last = NULL;
- for (p = mnt; p; p = next_mnt(p, mnt))
- list_move(&p->mnt_hash, &tmp_list);
+ for (p = mnt; p; p = next_mnt(p, mnt)) {
+ hlist_del_init_rcu(&p->mnt_hash);
+ hlist_add_head(&p->mnt_hash, &tmp_list);
+ }
if (how)
propagate_umount(&tmp_list);
- list_for_each_entry(p, &tmp_list, mnt_hash) {
+ hlist_for_each_entry(p, &tmp_list, mnt_hash) {
list_del_init(&p->mnt_expire);
list_del_init(&p->mnt_list);
__touch_mnt_namespace(p->mnt_ns);
@@ -1220,8 +1261,13 @@ void umount_tree(struct mount *mnt, int how)
p->mnt_mp = NULL;
}
change_mnt_propagation(p, MS_PRIVATE);
+ last = p;
+ }
+ if (last) {
+ last->mnt_hash.next = unmounted.first;
+ unmounted.first = tmp_list.first;
+ unmounted.first->pprev = &unmounted.first;
}
- list_splice(&tmp_list, &unmounted);
}
static void shrink_submounts(struct mount *mnt);
@@ -1605,24 +1651,23 @@ static int attach_recursive_mnt(struct mount *source_mnt,
struct mountpoint *dest_mp,
struct path *parent_path)
{
- LIST_HEAD(tree_list);
+ HLIST_HEAD(tree_list);
struct mount *child, *p;
+ struct hlist_node *n;
int err;
if (IS_MNT_SHARED(dest_mnt)) {
err = invent_group_ids(source_mnt, true);
if (err)
goto out;
- }
- err = propagate_mnt(dest_mnt, dest_mp, source_mnt, &tree_list);
- if (err)
- goto out_cleanup_ids;
-
- lock_mount_hash();
-
- if (IS_MNT_SHARED(dest_mnt)) {
+ err = propagate_mnt(dest_mnt, dest_mp, source_mnt, &tree_list);
+ if (err)
+ goto out_cleanup_ids;
+ lock_mount_hash();
for (p = source_mnt; p; p = next_mnt(p, source_mnt))
set_mnt_shared(p);
+ } else {
+ lock_mount_hash();
}
if (parent_path) {
detach_mnt(source_mnt, parent_path);
@@ -1630,20 +1675,22 @@ static int attach_recursive_mnt(struct mount *source_mnt,
touch_mnt_namespace(source_mnt->mnt_ns);
} else {
mnt_set_mountpoint(dest_mnt, dest_mp, source_mnt);
- commit_tree(source_mnt);
+ commit_tree(source_mnt, NULL);
}
- list_for_each_entry_safe(child, p, &tree_list, mnt_hash) {
- list_del_init(&child->mnt_hash);
- commit_tree(child);
+ hlist_for_each_entry_safe(child, n, &tree_list, mnt_hash) {
+ struct mount *q;
+ hlist_del_init(&child->mnt_hash);
+ q = __lookup_mnt_last(&child->mnt_parent->mnt,
+ child->mnt_mountpoint);
+ commit_tree(child, q);
}
unlock_mount_hash();
return 0;
out_cleanup_ids:
- if (IS_MNT_SHARED(dest_mnt))
- cleanup_group_ids(source_mnt, NULL);
+ cleanup_group_ids(source_mnt, NULL);
out:
return err;
}
@@ -2777,18 +2824,24 @@ void __init mnt_init(void)
mnt_cache = kmem_cache_create("mnt_cache", sizeof(struct mount),
0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
- mount_hashtable = (struct list_head *)__get_free_page(GFP_ATOMIC);
- mountpoint_hashtable = (struct list_head *)__get_free_page(GFP_ATOMIC);
+ mount_hashtable = alloc_large_system_hash("Mount-cache",
+ sizeof(struct hlist_head),
+ mhash_entries, 19,
+ 0,
+ &m_hash_shift, &m_hash_mask, 0, 0);
+ mountpoint_hashtable = alloc_large_system_hash("Mountpoint-cache",
+ sizeof(struct hlist_head),
+ mphash_entries, 19,
+ 0,
+ &mp_hash_shift, &mp_hash_mask, 0, 0);
if (!mount_hashtable || !mountpoint_hashtable)
panic("Failed to allocate mount hash table\n");
- printk(KERN_INFO "Mount-cache hash table entries: %lu\n", HASH_SIZE);
-
- for (u = 0; u < HASH_SIZE; u++)
- INIT_LIST_HEAD(&mount_hashtable[u]);
- for (u = 0; u < HASH_SIZE; u++)
- INIT_LIST_HEAD(&mountpoint_hashtable[u]);
+ for (u = 0; u <= m_hash_mask; u++)
+ INIT_HLIST_HEAD(&mount_hashtable[u]);
+ for (u = 0; u <= mp_hash_mask; u++)
+ INIT_HLIST_HEAD(&mountpoint_hashtable[u]);
err = sysfs_init();
if (err)
diff --git a/fs/pnode.c b/fs/pnode.c
index c7221bb19801..88396df725b4 100644
--- a/fs/pnode.c
+++ b/fs/pnode.c
@@ -220,14 +220,14 @@ static struct mount *get_source(struct mount *dest,
* @tree_list : list of heads of trees to be attached.
*/
int propagate_mnt(struct mount *dest_mnt, struct mountpoint *dest_mp,
- struct mount *source_mnt, struct list_head *tree_list)
+ struct mount *source_mnt, struct hlist_head *tree_list)
{
struct user_namespace *user_ns = current->nsproxy->mnt_ns->user_ns;
struct mount *m, *child;
int ret = 0;
struct mount *prev_dest_mnt = dest_mnt;
struct mount *prev_src_mnt = source_mnt;
- LIST_HEAD(tmp_list);
+ HLIST_HEAD(tmp_list);
for (m = propagation_next(dest_mnt, dest_mnt); m;
m = propagation_next(m, dest_mnt)) {
@@ -246,27 +246,29 @@ int propagate_mnt(struct mount *dest_mnt, struct mountpoint *dest_mp,
child = copy_tree(source, source->mnt.mnt_root, type);
if (IS_ERR(child)) {
ret = PTR_ERR(child);
- list_splice(tree_list, tmp_list.prev);
+ tmp_list = *tree_list;
+ tmp_list.first->pprev = &tmp_list.first;
+ INIT_HLIST_HEAD(tree_list);
goto out;
}
if (is_subdir(dest_mp->m_dentry, m->mnt.mnt_root)) {
mnt_set_mountpoint(m, dest_mp, child);
- list_add_tail(&child->mnt_hash, tree_list);
+ hlist_add_head(&child->mnt_hash, tree_list);
} else {
/*
* This can happen if the parent mount was bind mounted
* on some subdirectory of a shared/slave mount.
*/
- list_add_tail(&child->mnt_hash, &tmp_list);
+ hlist_add_head(&child->mnt_hash, &tmp_list);
}
prev_dest_mnt = m;
prev_src_mnt = child;
}
out:
lock_mount_hash();
- while (!list_empty(&tmp_list)) {
- child = list_first_entry(&tmp_list, struct mount, mnt_hash);
+ while (!hlist_empty(&tmp_list)) {
+ child = hlist_entry(tmp_list.first, struct mount, mnt_hash);
umount_tree(child, 0);
}
unlock_mount_hash();
@@ -338,8 +340,10 @@ static void __propagate_umount(struct mount *mnt)
* umount the child only if the child has no
* other children
*/
- if (child && list_empty(&child->mnt_mounts))
- list_move_tail(&child->mnt_hash, &mnt->mnt_hash);
+ if (child && list_empty(&child->mnt_mounts)) {
+ hlist_del_init_rcu(&child->mnt_hash);
+ hlist_add_before_rcu(&child->mnt_hash, &mnt->mnt_hash);
+ }
}
}
@@ -350,11 +354,11 @@ static void __propagate_umount(struct mount *mnt)
*
* vfsmount lock must be held for write
*/
-int propagate_umount(struct list_head *list)
+int propagate_umount(struct hlist_head *list)
{
struct mount *mnt;
- list_for_each_entry(mnt, list, mnt_hash)
+ hlist_for_each_entry(mnt, list, mnt_hash)
__propagate_umount(mnt);
return 0;
}
diff --git a/fs/pnode.h b/fs/pnode.h
index 59e7eda1851e..fc28a27fa892 100644
--- a/fs/pnode.h
+++ b/fs/pnode.h
@@ -36,8 +36,8 @@ static inline void set_mnt_shared(struct mount *mnt)
void change_mnt_propagation(struct mount *, int);
int propagate_mnt(struct mount *, struct mountpoint *, struct mount *,
- struct list_head *);
-int propagate_umount(struct list_head *);
+ struct hlist_head *);
+int propagate_umount(struct hlist_head *);
int propagate_mount_busy(struct mount *, int);
void mnt_release_group_id(struct mount *);
int get_dominating_id(struct mount *mnt, const struct path *root);
diff --git a/fs/proc/page.c b/fs/proc/page.c
index b8730d9ebaee..2a8cc94bb641 100644
--- a/fs/proc/page.c
+++ b/fs/proc/page.c
@@ -121,7 +121,7 @@ u64 stable_page_flags(struct page *page)
* just checks PG_head/PG_tail, so we need to check PageLRU to make
* sure a given page is a thp, not a non-huge compound page.
*/
- else if (PageTransCompound(page) && PageLRU(compound_trans_head(page)))
+ else if (PageTransCompound(page) && PageLRU(compound_head(page)))
u |= 1 << KPF_THP;
/*
diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index abc9ca778456..be5fd38bd5a0 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -196,6 +196,21 @@ static inline unsigned long __ffs64(u64 word)
#ifdef __KERNEL__
+#ifndef set_mask_bits
+#define set_mask_bits(ptr, _mask, _bits) \
+({ \
+ const typeof(*ptr) mask = (_mask), bits = (_bits); \
+ typeof(*ptr) old, new; \
+ \
+ do { \
+ old = ACCESS_ONCE(*ptr); \
+ new = (old & ~mask) | bits; \
+ } while (cmpxchg(ptr, old, new) != old); \
+ \
+ new; \
+})
+#endif
+
#ifndef find_last_bit
/**
* find_last_bit - find the last set bit in a memory region
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 39c1d9469677..10d59f3a5ebd 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -169,6 +169,8 @@ struct cgroup {
*
* The ID of the root cgroup is always 0, and a new cgroup
* will be assigned with a smallest available ID.
+ *
+ * Allocating/Removing ID must be protected by cgroup_mutex.
*/
int id;
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 91672e2deec3..b826239bdce0 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -157,23 +157,6 @@ static inline int hpage_nr_pages(struct page *page)
return HPAGE_PMD_NR;
return 1;
}
-static inline struct page *compound_trans_head(struct page *page)
-{
- if (PageTail(page)) {
- struct page *head;
- head = page->first_page;
- smp_rmb();
- /*
- * head may be a dangling pointer.
- * __split_huge_page_refcount clears PageTail before
- * overwriting first_page, so if PageTail is still
- * there it means the head pointer isn't dangling.
- */
- if (PageTail(page))
- return head;
- }
- return page;
-}
extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, pmd_t pmd, pmd_t *pmdp);
@@ -203,7 +186,6 @@ static inline int split_huge_page(struct page *page)
do { } while (0)
#define split_huge_page_pmd_mm(__mm, __address, __pmd) \
do { } while (0)
-#define compound_trans_head(page) compound_head(page)
static inline int hugepage_madvise(struct vm_area_struct *vma,
unsigned long *vm_flags, int advice)
{
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 0ab54390a63b..5360b8245109 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -389,8 +389,18 @@ static inline void compound_unlock_irqrestore(struct page *page,
static inline struct page *compound_head(struct page *page)
{
- if (unlikely(PageTail(page)))
- return page->first_page;
+ if (unlikely(PageTail(page))) {
+ struct page *head = page->first_page;
+
+ /*
+ * page->first_page may be a dangling pointer to an old
+ * compound page, so recheck that it is still a tail
+ * page before returning.
+ */
+ smp_rmb();
+ if (likely(PageTail(page)))
+ return head;
+ }
return page;
}
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 271acd834913..b44dd4989bc1 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4363,16 +4363,6 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
rcu_assign_pointer(cgrp->name, name);
/*
- * Temporarily set the pointer to NULL, so idr_find() won't return
- * a half-baked cgroup.
- */
- cgrp->id = idr_alloc(&root->cgroup_idr, NULL, 1, 0, GFP_KERNEL);
- if (cgrp->id < 0) {
- err = -ENOMEM;
- goto err_free_name;
- }
-
- /*
* Only live parents can have children. Note that the liveliness
* check isn't strictly necessary because cgroup_mkdir() and
* cgroup_rmdir() are fully synchronized by i_mutex; however, do it
@@ -4381,7 +4371,7 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
*/
if (!cgroup_lock_live_group(parent)) {
err = -ENODEV;
- goto err_free_id;
+ goto err_free_name;
}
/* Grab a reference on the superblock so the hierarchy doesn't
@@ -4391,6 +4381,16 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
* fs */
atomic_inc(&sb->s_active);
+ /*
+ * Temporarily set the pointer to NULL, so idr_find() won't return
+ * a half-baked cgroup.
+ */
+ cgrp->id = idr_alloc(&root->cgroup_idr, NULL, 1, 0, GFP_KERNEL);
+ if (cgrp->id < 0) {
+ err = -ENOMEM;
+ goto err_unlock;
+ }
+
init_cgroup_housekeeping(cgrp);
dentry->d_fsdata = cgrp;
@@ -4491,11 +4491,11 @@ err_free_all:
ss->css_free(css);
}
}
+ idr_remove(&root->cgroup_idr, cgrp->id);
+err_unlock:
mutex_unlock(&cgroup_mutex);
/* Release the reference count that we took on the superblock */
deactivate_super(sb);
-err_free_id:
- idr_remove(&root->cgroup_idr, cgrp->id);
err_free_name:
kfree(rcu_dereference_raw(cgrp->name));
err_free_cgrp:
diff --git a/lib/random32.c b/lib/random32.c
index 1e5b2df44291..614896778700 100644
--- a/lib/random32.c
+++ b/lib/random32.c
@@ -244,8 +244,19 @@ static void __prandom_reseed(bool late)
static bool latch = false;
static DEFINE_SPINLOCK(lock);
+ /* Asking for random bytes might result in bytes getting
+ * moved into the nonblocking pool and thus marking it
+ * as initialized. In this case we would double back into
+ * this function and attempt to do a late reseed.
+ * Ignore the pointless attempt to reseed again if we're
+ * already waiting for bytes when the nonblocking pool
+ * got initialized.
+ */
+
/* only allow initial seeding (late == false) once */
- spin_lock_irqsave(&lock, flags);
+ if (!spin_trylock_irqsave(&lock, flags))
+ return;
+
if (latch && !late)
goto out;
latch = true;
diff --git a/mm/ksm.c b/mm/ksm.c
index 175fff79dc95..418b8cad8b01 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -444,7 +444,7 @@ static void break_cow(struct rmap_item *rmap_item)
static struct page *page_trans_compound_anon(struct page *page)
{
if (PageTransCompound(page)) {
- struct page *head = compound_trans_head(page);
+ struct page *head = compound_head(page);
/*
* head may actually be splitted and freed from under
* us but it's ok here.
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 90977ac8bed8..4566e8fa7b71 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1645,7 +1645,7 @@ int soft_offline_page(struct page *page, int flags)
{
int ret;
unsigned long pfn = page_to_pfn(page);
- struct page *hpage = compound_trans_head(page);
+ struct page *hpage = compound_head(page);
if (PageHWPoison(page)) {
pr_info("soft offline: %#lx page already poisoned\n", pfn);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 56f268de3d41..589521d432d8 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -369,9 +369,11 @@ void prep_compound_page(struct page *page, unsigned long order)
__SetPageHead(page);
for (i = 1; i < nr_pages; i++) {
struct page *p = page + i;
- __SetPageTail(p);
set_page_count(p, 0);
p->first_page = page;
+ /* Make sure p->first_page is always valid for PageTail() */
+ smp_wmb();
+ __SetPageTail(p);
}
}
diff --git a/mm/swap.c b/mm/swap.c
index 84b26aaabd03..7010cf417fdf 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -84,7 +84,7 @@ static void put_compound_page(struct page *page)
{
if (unlikely(PageTail(page))) {
/* __split_huge_page_refcount can run under us */
- struct page *page_head = compound_trans_head(page);
+ struct page *page_head = compound_head(page);
if (likely(page != page_head &&
get_page_unless_zero(page_head))) {
@@ -222,7 +222,7 @@ bool __get_page_tail(struct page *page)
*/
unsigned long flags;
bool got = false;
- struct page *page_head = compound_trans_head(page);
+ struct page *page_head = compound_head(page);
if (likely(page != page_head && get_page_unless_zero(page_head))) {
/* Ref to put_compound_page() comment. */
diff --git a/net/netfilter/nf_conntrack_proto_dccp.c b/net/netfilter/nf_conntrack_proto_dccp.c
index a99b6c3427b0..59359bec328a 100644
--- a/net/netfilter/nf_conntrack_proto_dccp.c
+++ b/net/netfilter/nf_conntrack_proto_dccp.c
@@ -428,7 +428,7 @@ static bool dccp_new(struct nf_conn *ct, const struct sk_buff *skb,
const char *msg;
u_int8_t state;
- dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh);
+ dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh);
BUG_ON(dh == NULL);
state = dccp_state_table[CT_DCCP_ROLE_CLIENT][dh->dccph_type][CT_DCCP_NONE];
@@ -486,7 +486,7 @@ static int dccp_packet(struct nf_conn *ct, const struct sk_buff *skb,
u_int8_t type, old_state, new_state;
enum ct_dccp_roles role;
- dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh);
+ dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh);
BUG_ON(dh == NULL);
type = dh->dccph_type;
@@ -577,7 +577,7 @@ static int dccp_error(struct net *net, struct nf_conn *tmpl,
unsigned int cscov;
const char *msg;
- dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh);
+ dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh);
if (dh == NULL) {
msg = "nf_ct_dccp: short packet ";
goto out_invalid;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists