From: Andrey Ryabinin Date: Wed, 30 Jul 2014 23:08:35 +0000 (-0700) Subject: mm: debugfs: move rounddown_pow_of_two() out from do_fault path X-Git-Tag: omap-for-v3.17/fixes-against-rc2~210^2~3 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b4903d6e8408e6137ee4666ee67ec566b74a0f05;p=pandora-kernel.git 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 [akpm@linux-foundation.org: 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 --- Reading git-diff-tree failed