linux-kernel - mm/vmemmap: fix wrong use of virt_to

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Date:	Tue, 27 Nov 2012 10:17:13 +0800
From:	Jianguo Wu <wujianguo@...wei.com>
To:	<akpm@...ux-foundation.org>, <rientjes@...gle.com>,
	Michal Hocko <mhocko@...e.cz>, <shangw@...ux.vnet.ibm.com>,
	<hannes@...xchg.org>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<wency@...fujitsu.com>, <isimatu.yasuaki@...fujitsu.com>,
	Tang Chen <tangchen@...fujitsu.com>,
	Liujiang <jiang.liu@...wei.com>, qiuxishi <qiuxishi@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>
Subject: mm/vmemmap: fix wrong use of virt_to_page

I enable CONFIG_DEBUG_VIRTUAL and CONFIG_SPARSEMEM_VMEMMAP, when doing memory hotremove,
there is a kernel BUG at arch/x86/mm/physaddr.c:20.

It is caused by free_section_usemap()->virt_to_page(),
virt_to_page() is only used for kernel direct mapping address,
but sparse-vmemmap uses vmemmap address, so it is going wrong here.

[  517.727381] ------------[ cut here ]------------
[  517.728851] kernel BUG at arch/x86/mm/physaddr.c:20!
[  517.728851] invalid opcode: 0000 [#1] SMP
[  517.740170] Modules linked in: acpihp_drv acpihp_slot edd cpufreq_conservativ
e cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf fuse vfat fat loop dm_m
od coretemp kvm crc32c_intel ipv6 ixgbe igb iTCO_wdt i7core_edac edac_core pcspk
r iTCO_vendor_support ioatdma microcode joydev sr_mod i2c_i801 dca lpc_ich mfd_c
ore mdio tpm_tis i2c_core hid_generic tpm cdrom sg tpm_bios rtc_cmos button ext3
 jbd mbcache usbhid hid uhci_hcd ehci_hcd usbcore usb_common sd_mod crc_t10dif p
rocessor thermal_sys hwmon scsi_dh_alua scsi_dh_hp_sw scsi_dh_rdac scsi_dh_emc s
csi_dh ata_generic ata_piix libata megaraid_sas scsi_mod
[  517.740170] CPU 39
[  517.740170] Pid: 6454, comm: sh Not tainted 3.7.0-rc1-acpihp-final+ #45 QCI Q
SSC-S4R/QSSC-S4R
[  517.740170] RIP: 0010:[<ffffffff8103c908>]  [<ffffffff8103c908>] __phys_addr+
0x88/0x90
[  517.740170] RSP: 0018:ffff8804440d7c08  EFLAGS: 00010006
[  517.740170] RAX: 0000000000000006 RBX: ffffea0012000000 RCX: 000000000000002c

[  517.740170] RDX: 0000620012000000 RSI: 0000000000000000 RDI: ffffea0012000000

[  517.740170] RBP: ffff8804440d7c08 R08: 0070000000000400 R09: 0000000000488000

[  517.740170] R10: 0000000000000091 R11: 0000000000000001 R12: ffff88047fb87800

[  517.740170] R13: ffffea0000000000 R14: ffff88047ffb3440 R15: 0000000000480000

[  517.740170] FS:  00007f0462b49700(0000) GS:ffff8804570c0000(0000) knlGS:00000
00000000000
[  517.740170] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  517.740170] CR2: 00007f006dc5fd14 CR3: 0000000440e85000 CR4: 00000000000007e0

[  517.740170] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

[  517.896799] DR3: 0000000000000000 DR6

Signed-off-by: Jianguo Wu <wujianguo@...wei.com>
Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
---
 mm/sparse.c |   10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index fac95f2..a83de2f 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -617,7 +617,7 @@ static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
 {
 	return; /* XXX: Not implemented yet */
 }
-static void free_map_bootmem(struct page *page, unsigned long nr_pages)
+static void free_map_bootmem(struct page *memmap, unsigned long nr_pages)
 {
 }
 #else
@@ -658,10 +658,11 @@ static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
 			   get_order(sizeof(struct page) * nr_pages));
 }

-static void free_map_bootmem(struct page *page, unsigned long nr_pages)
+static void free_map_bootmem(struct page *memmap, unsigned long nr_pages)
 {
 	unsigned long maps_section_nr, removing_section_nr, i;
 	unsigned long magic;
+	struct page *page = virt_to_page(memmap);

 	for (i = 0; i < nr_pages; i++, page++) {
 		magic = (unsigned long) page->lru.next;
@@ -710,13 +711,10 @@ static void free_section_usemap(struct page *memmap, unsigned long *usemap)
 	 */

 	if (memmap) {
-		struct page *memmap_page;
-		memmap_page = virt_to_page(memmap);
-
 		nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page))
 			>> PAGE_SHIFT;

-		free_map_bootmem(memmap_page, nr_pages);
+		free_map_bootmem(memmap, nr_pages);
 	}
 }

-- 
1.7.1

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