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Message-Id: <200905252003.n4PK3sFi014919@voreg.hos.anvin.org>
Date: Mon, 25 May 2009 13:03:54 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...e.hu>,
"Thomas Gleixner <tglx@...utronix.de> Suresh Siddha"
<suresh.siddha@...el.com>, Tejun Heo <tj@...nel.org>,
Venkatesh Pallapadi <venkatesh.pallapadi@...el.com>,
Zhang Rui <rui.zhang@...el.com>,
"H. Peter Anvin" <hpa@...or.com>
Subject: [GIT PULL] x86 fixes for 2.6.30-rc8
Hi Linus,
A small batch of x86 fixes.
The following changes since commit 59a3759d0fe8d969888c741bb33f4946e4d3750d:
Linus Torvalds (1):
Linux 2.6.30-rc7
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git x86-fixes-for-linus
H. Peter Anvin (1):
x86, setup: revert ACPI 3 E820 extended attributes support
Suresh Siddha (1):
x86: introduce noxsave boot parameter
Tejun Heo (1):
x86: Remove remap percpu allocator for the time being
Zhang Rui (1):
x86: DMI match for the Sony VGN-Z540N as it needs BIOS reboot
venkatesh.pallipadi@...el.com (2):
x86: bugfix wbinvd() model check instead of family check
x86: cpa_flush_array wbinvd should be done on all CPUs
Documentation/kernel-parameters.txt | 4 ++++
arch/x86/boot/memory.c | 29 +++++++++++++----------------
arch/x86/kernel/cpu/common.c | 7 +++++++
arch/x86/kernel/reboot.c | 8 ++++++++
arch/x86/kernel/setup_percpu.c | 4 +++-
arch/x86/mm/pageattr.c | 12 +++++++++---
6 files changed, 44 insertions(+), 20 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index e87bdbf..fd5cac0 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1535,6 +1535,10 @@ and is between 256 and 4096 characters. It is defined in the file
register save and restore. The kernel will only save
legacy floating-point registers on task switch.
+ noxsave [BUGS=X86] Disables x86 extended register state save
+ and restore using xsave. The kernel will fallback to
+ enabling legacy floating-point and sse state.
+
nohlt [BUGS=ARM,SH] Tells the kernel that the sleep(SH) or
wfi(ARM) instruction doesn't work correctly and not to
use it. This is also useful when using JTAG debugger.
diff --git a/arch/x86/boot/memory.c b/arch/x86/boot/memory.c
index 5054c2d..74b3d2b 100644
--- a/arch/x86/boot/memory.c
+++ b/arch/x86/boot/memory.c
@@ -17,11 +17,6 @@
#define SMAP 0x534d4150 /* ASCII "SMAP" */
-struct e820_ext_entry {
- struct e820entry std;
- u32 ext_flags;
-} __attribute__((packed));
-
static int detect_memory_e820(void)
{
int count = 0;
@@ -29,13 +24,21 @@ static int detect_memory_e820(void)
u32 size, id, edi;
u8 err;
struct e820entry *desc = boot_params.e820_map;
- static struct e820_ext_entry buf; /* static so it is zeroed */
+ static struct e820entry buf; /* static so it is zeroed */
/*
- * Set this here so that if the BIOS doesn't change this field
- * but still doesn't change %ecx, we're still okay...
+ * Note: at least one BIOS is known which assumes that the
+ * buffer pointed to by one e820 call is the same one as
+ * the previous call, and only changes modified fields. Therefore,
+ * we use a temporary buffer and copy the results entry by entry.
+ *
+ * This routine deliberately does not try to account for
+ * ACPI 3+ extended attributes. This is because there are
+ * BIOSes in the field which report zero for the valid bit for
+ * all ranges, and we don't currently make any use of the
+ * other attribute bits. Revisit this if we see the extended
+ * attribute bits deployed in a meaningful way in the future.
*/
- buf.ext_flags = 1;
do {
size = sizeof buf;
@@ -66,13 +69,7 @@ static int detect_memory_e820(void)
break;
}
- /* ACPI 3.0 added the extended flags support. If bit 0
- in the extended flags is zero, we're supposed to simply
- ignore the entry -- a backwards incompatible change! */
- if (size > 20 && !(buf.ext_flags & 1))
- continue;
-
- *desc++ = buf.std;
+ *desc++ = buf;
count++;
} while (next && count < ARRAY_SIZE(boot_params.e820_map));
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index c1caefc..77848d9 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -114,6 +114,13 @@ DEFINE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page) = { .gdt = {
} };
EXPORT_PER_CPU_SYMBOL_GPL(gdt_page);
+static int __init x86_xsave_setup(char *s)
+{
+ setup_clear_cpu_cap(X86_FEATURE_XSAVE);
+ return 1;
+}
+__setup("noxsave", x86_xsave_setup);
+
#ifdef CONFIG_X86_32
static int cachesize_override __cpuinitdata = -1;
static int disable_x86_serial_nr __cpuinitdata = 1;
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 1340dad..667188e 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -232,6 +232,14 @@ static struct dmi_system_id __initdata reboot_dmi_table[] = {
DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
},
},
+ { /* Handle problems with rebooting on Sony VGN-Z540N */
+ .callback = set_bios_reboot,
+ .ident = "Sony VGN-Z540N",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
+ },
+ },
{ }
};
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 3a97a4c..8f0e13b 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -160,8 +160,10 @@ static ssize_t __init setup_pcpu_remap(size_t static_size)
/*
* If large page isn't supported, there's no benefit in doing
* this. Also, on non-NUMA, embedding is better.
+ *
+ * NOTE: disabled for now.
*/
- if (!cpu_has_pse || !pcpu_need_numa())
+ if (true || !cpu_has_pse || !pcpu_need_numa())
return -EINVAL;
/*
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 797f9f1..0f9052b 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -153,7 +153,7 @@ static void __cpa_flush_all(void *arg)
*/
__flush_tlb_all();
- if (cache && boot_cpu_data.x86_model >= 4)
+ if (cache && boot_cpu_data.x86 >= 4)
wbinvd();
}
@@ -204,6 +204,11 @@ static void cpa_flush_range(unsigned long start, int numpages, int cache)
}
}
+static void wbinvd_local(void *unused)
+{
+ wbinvd();
+}
+
static void cpa_flush_array(unsigned long *start, int numpages, int cache,
int in_flags, struct page **pages)
{
@@ -218,8 +223,9 @@ static void cpa_flush_array(unsigned long *start, int numpages, int cache,
/* 4M threshold */
if (numpages >= 1024) {
- if (boot_cpu_data.x86_model >= 4)
- wbinvd();
+ if (boot_cpu_data.x86 >= 4)
+ on_each_cpu(wbinvd_local, NULL, 1);
+
return;
}
/*
--
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