mm/vmemmap: fix wrong use of virt_to_page
From: Jianguo Wu
Date: Mon Nov 26 2012 - 21:21:22 EST
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@xxxxxxxxxx>
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxx>
---
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/