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authorChen, Kenneth W <kenneth.w.chen@intel.com>2006-10-04 02:15:24 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-04 07:55:12 -0700
commitfe1668ae5bf0145014c71797febd9ad5670d5d05 (patch)
treea1ad042a0c9b604653ca24645358fe31d1bbcfd6 /Documentation
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[PATCH] enforce proper tlb flush in unmap_hugepage_range
Spotted by Hugh that hugetlb page is free'ed back to global pool before performing any TLB flush in unmap_hugepage_range(). This potentially allow threads to abuse free-alloc race condition. The generic tlb gather code is unsuitable to use by hugetlb, I just open coded a page gathering list and delayed put_page until tlb flush is performed. Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Ken Chen <kenneth.w.chen@intel.com> Acked-by: William Irwin <wli@holomorphy.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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