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SubjectRe: [PATCH]mm: use correct address for pte_unmap_unlock in zap_pte_range
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On Wed, 2011-06-15 at 18:29 +0800, Shaohua Li wrote:
> Boot an i386 kernel, I got:
> [ 3.766613] WARNING: at /workshop/kernel/git/my/linux/arch/x86/mm/highmem_32.c:81 __kunmap_atomic+0x6f/0x113()
> [ 3.766615] Hardware name: Studio XPS 8000
> [ 3.766617] Modules linked in:
> [ 3.766619] Pid: 214, comm: blkid Not tainted 3.0.0-rc3+ #529
> [ 3.766621] Call Trace:
> [ 3.766625] [<c1063803>] warn_slowpath_common+0x6a/0x7f
> [ 3.766628] [<c104f494>] ? __kunmap_atomic+0x6f/0x113
> [ 3.766631] [<c106382c>] warn_slowpath_null+0x14/0x18
> [ 3.766633] [<c104f494>] __kunmap_atomic+0x6f/0x113
> [ 3.766637] [<c10e6033>] zap_pte_range+0x291/0x2b4
> [ 3.766641] [<c105a37d>] ? get_parent_ip+0xb/0x31
> [ 3.766644] [<c10e6180>] unmap_page_range+0x12a/0x147
> [ 3.766647] [<c10e6243>] unmap_vmas+0xa6/0xe2
> [ 3.766650] [<c10e7c26>] exit_mmap+0x78/0xd3
> [ 3.766654] [<c106207a>] mmput+0x39/0x99
> [ 3.766657] [<c106582f>] exit_mm+0x101/0x109
> [ 3.766660] [<c1066d83>] do_exit+0x1e6/0x312
> [ 3.766664] [<c10fff66>] ? fput+0x18/0x1a
> [ 3.766666] [<c1066f16>] do_group_exit+0x67/0x8a
> [ 3.766669] [<c1066f51>] sys_exit_group+0x18/0x1c
> [ 3.766673] [<c1620154>] syscall_call+0x7/0xb
>
> the zap_pte_range does:
> pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
> do {
> ...
> if (force_flush)
> break;
> ...
> } while (pte++, addr += PAGE_SIZE, addr != end);
>
> pte_unmap_unlock(pte - 1, ptl);
>
> the pte_unmap_unlock(pte - 1) only works if pte++ does once.
>
> this is a regression introduced by d16dfc550f5326a4000f3(mm: mmu_gather
> rework)

Already send by Steven and picked up by Andrew:

lkml.kernel.org/r/1307158665.3667.86.camel@gandalf.stny.rr.com
lkml.kernel.org/r/201106040413.p544D9ox027032@imap1.linux-foundation.org

Apparently it hasn't made its way to Linus though.


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