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David Daney acd168c0bf MIPS: Fix page table corruption on THP permission changes. 
When the core THP code is modifying the permissions of a huge page it
calls pmd_modify(), which unfortunately was clearing the _PAGE_HUGE bit
of the page table entry.  The result can be kernel messages like:

mm/memory.c:397: bad pmd 000000040080004d.
mm/memory.c:397: bad pmd 00000003ff00004d.
mm/memory.c:397: bad pmd 000000040100004d.

or:

------------[ cut here ]------------
WARNING: at mm/mmap.c:3200 exit_mmap+0x150/0x158()
Modules linked in: ipv6 at24 octeon3_ethernet octeon_srio_nexus m25p80
CPU: 12 PID: 1295 Comm: pmderr Not tainted 3.10.87-rt80-Cavium-Octeon #4
Stack : 0000000040808000 0000000014009ce1 0000000000400004 ffffffff81076ba0
          0000000000000000 0000000000000000 ffffffff85110000 0000000000000119
          0000000000000004 0000000000000000 0000000000000119 43617669756d2d4f
          0000000000000000 ffffffff850fda40 ffffffff85110000 0000000000000000
          0000000000000000 0000000000000009 ffffffff809207a0 0000000000000c80
          ffffffff80f1bf20 0000000000000001 000000ffeca36828 0000000000000001
          0000000000000000 0000000000000001 000000ffeca7e700 ffffffff80886924
          80000003fd7a0000 80000003fd7a39b0 80000003fdea8000 ffffffff80885780
          80000003fdea8000 ffffffff80f12218 000000000000000c 000000000000050f
          0000000000000000 ffffffff80865c4c 0000000000000000 0000000000000000
          ...
Call Trace:
[<ffffffff80865c4c>] show_stack+0x6c/0xf8
[<ffffffff80885780>] warn_slowpath_common+0x78/0xa8
[<ffffffff809207a0>] exit_mmap+0x150/0x158
[<ffffffff80882d44>] mmput+0x5c/0x110
[<ffffffff8088b450>] do_exit+0x230/0xa68
[<ffffffff8088be34>] do_group_exit+0x54/0x1d0
[<ffffffff8088bfc0>] __wake_up_parent+0x0/0x18

---[ end trace c7b38293191c57dc ]---
BUG: Bad rss-counter state mm:80000003fa168000 idx:1 val:1536

Fix by not clearing _PAGE_HUGE bit.

Signed-off-by: David Daney <david.daney@cavium.com>
Tested-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Cc: stable@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13687/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2016-07-06 15:09:36 +02:00
..
alpha tree wide: get rid of __GFP_REPEAT for order-0 allocations part I 2016-06-24 17:23:52 -07:00
arc ARC Fix for 4.7-rc6 2016-06-30 09:53:43 -07:00
arm KVM/ARM Fixes for v4.7-rc6: 2016-06-30 17:11:20 +02:00
arm64 Merge branch 'akpm' (patches from Andrew) 2016-06-24 19:08:33 -07:00
avr32 tree wide: get rid of __GFP_REPEAT for order-0 allocations part I 2016-06-24 17:23:52 -07:00
blackfin printk/nmi: generic solution for safe printk in NMI 2016-05-20 17:58:30 -07:00
c6x asm-generic patch for 4.7 2016-05-24 15:24:37 -07:00
cris tree wide: get rid of __GFP_REPEAT for order-0 allocations part I 2016-06-24 17:23:52 -07:00
frv tree wide: get rid of __GFP_REPEAT for order-0 allocations part I 2016-06-24 17:23:52 -07:00
h8300 Merge branch 'hash' of git://ftp.sciencehorizons.net/linux 2016-05-28 16:15:25 -07:00
hexagon tree wide: get rid of __GFP_REPEAT for order-0 allocations part I 2016-06-24 17:23:52 -07:00
ia64 fix up initial thread stack pointer vs thread_info confusion 2016-06-24 17:07:33 -07:00
m32r Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2016-05-26 22:01:22 -07:00
m68k tree wide: get rid of __GFP_REPEAT for order-0 allocations part I 2016-06-24 17:23:52 -07:00
metag tree wide: get rid of __GFP_REPEAT for order-0 allocations part I 2016-06-24 17:23:52 -07:00
microblaze tree wide: get rid of __GFP_REPEAT for order-0 allocations part I 2016-06-24 17:23:52 -07:00
mips MIPS: Fix page table corruption on THP permission changes. 2016-07-06 15:09:36 +02:00
mn10300 Merge branch 'akpm' (patches from Andrew) 2016-06-24 19:08:33 -07:00
nios2 nios2: get rid of superfluous __GFP_REPEAT 2016-06-24 17:23:52 -07:00
openrisc tree wide: get rid of __GFP_REPEAT for order-0 allocations part I 2016-06-24 17:23:52 -07:00
parisc parisc: get rid of superfluous __GFP_REPEAT 2016-06-24 17:23:52 -07:00
powerpc powerpc fixes for 4.7 #5 2016-07-02 17:47:54 -07:00
s390 s390: fix test_fp_ctl inline assembly contraints 2016-06-28 09:24:28 +02:00
score score: get rid of superfluous __GFP_REPEAT 2016-06-24 17:23:52 -07:00
sh sh: get rid of superfluous __GFP_REPEAT 2016-06-24 17:23:52 -07:00
sparc sparc: get rid of superfluous __GFP_REPEAT 2016-06-24 17:23:52 -07:00
tile Merge branch 'akpm' (patches from Andrew) 2016-06-24 19:08:33 -07:00
um tree wide: get rid of __GFP_REPEAT for order-0 allocations part I 2016-06-24 17:23:52 -07:00
unicore32 unicore32: get rid of superfluous __GFP_REPEAT 2016-06-24 17:23:52 -07:00
x86 KVM: nVMX: VMX instructions: fix segment checks when L1 is in long mode. 2016-06-27 15:30:44 +02:00
xtensa tree wide: get rid of __GFP_REPEAT for order-0 allocations part I 2016-06-24 17:23:52 -07:00
.gitignore
Kconfig Clarify naming of thread info/stack allocators 2016-06-24 15:09:37 -07:00