path: root/kernel/kexec.c
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authorAndrey Ryabinin <>2014-07-30 16:08:35 -0700
committerLinus Torvalds <>2014-07-30 17:16:13 -0700
commitb4903d6e8408e6137ee4666ee67ec566b74a0f05 (patch)
tree2db6b545dd1e56bac8602974fe74ca0cc773d67a /kernel/kexec.c
parent2bcf2e92c3918ce62ab4e934256e47e9a16d19c3 (diff)
mm: debugfs: move rounddown_pow_of_two() out from do_fault path
do_fault_around() expects fault_around_bytes rounded down to nearest page order. Instead of calling rounddown_pow_of_two every time in fault_around_pages()/fault_around_mask() we could do round down when user changes fault_around_bytes via debugfs interface. This also fixes bug when user set fault_around_bytes to 0. Result of rounddown_pow_of_two(0) is not defined, therefore fault_around_bytes == 0 doesn't work without this patch. Let's set fault_around_bytes to PAGE_SIZE if user sets to something less than PAGE_SIZE [ tweak code layout] Fixes: a9b0f861("mm: nominate faultaround area in bytes rather than page order") Signed-off-by: Andrey Ryabinin <> Reported-by: Sasha Levin <> Acked-by: Kirill A. Shutemov <> Cc: <> [3.15.x] Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'kernel/kexec.c')
0 files changed, 0 insertions, 0 deletions