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| author |   Mika Penttilä <mika.penttila@nextfour.com> | 2016-01-26 15:47:25 +0000 |
|---|---|---|
| committer |   Will Deacon <will.deacon@arm.com> | 2016-01-26 15:56:44 +0000 |
| commit | 57adec866c0440976c96a4b8f5b59fb411b1cacb (patch) | |
| tree | 704d55bf1775027161daf3c01cb373fc8e719a89 /tools/perf/scripts/python/syscall-counts.py | |
| parent | arm64: defconfig: updates for 4.5 (diff) | |
| download | linux-dev-57adec866c0440976c96a4b8f5b59fb411b1cacb.tar.xz linux-dev-57adec866c0440976c96a4b8f5b59fb411b1cacb.zip | |
arm64: mm: avoid calling apply_to_page_range on empty range
Calling apply_to_page_range with an empty range results in a BUG_ON
from the core code. This can be triggered by trying to load the st_drv
module with CONFIG_DEBUG_SET_MODULE_RONX enabled:
kernel BUG at mm/memory.c:1874!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
Modules linked in:
CPU: 3 PID: 1764 Comm: insmod Not tainted 4.5.0-rc1+ #2
Hardware name: ARM Juno development board (r0) (DT)
task: ffffffc9763b8000 ti: ffffffc975af8000 task.ti: ffffffc975af8000
PC is at apply_to_page_range+0x2cc/0x2d0
LR is at change_memory_common+0x80/0x108
This patch fixes the issue by making change_memory_common (called by the
set_memory_* functions) a NOP when numpages == 0, therefore avoiding the
erroneous call to apply_to_page_range and bringing us into line with x86
and s390.
Cc: <stable@vger.kernel.org>
Reviewed-by: Laura Abbott <labbott@redhat.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Mika Penttilä <mika.penttila@nextfour.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts.py')
0 files changed, 0 insertions, 0 deletions