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authorMichel Lespinasse <walken@google.com>2012-12-12 04:01:56 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-12 05:22:25 +0400
commit7d025059650f1c41a427173789ac14b74212b361 (patch)
tree5905f22f0ff11f96850d7caeec90c8ae898c6d47 /fs/hugetlbfs
parentf99024729e689f5de4534fde5400e3b035f068de (diff)
downloadlinux-7d025059650f1c41a427173789ac14b74212b361.tar.xz
mm: fix cache coloring on x86_64 architecture
Fix the x86-64 cache alignment code to take pgoff into account. Use the x86 and MIPS cache alignment code as the basis for a generic cache alignment function. The old x86 code will always align the mmap to aliasing boundaries, even if the program mmaps the file with a non-zero pgoff. If program A mmaps the file with pgoff 0, and program B mmaps the file with pgoff 1. The old code would align the mmaps, resulting in misaligned pages: A: 0123 B: 123 After this patch, they are aligned so the pages line up: A: 0123 B: 123 Proposed by Rik van Riel. Signed-off-by: Michel Lespinasse <walken@google.com> Cc: Rik van Riel <riel@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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