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authorHugh Dickins <hugh@veritas.com>2008-06-05 15:09:02 +0100
committerChris Wright <chrisw@sous-sol.org>2008-06-09 11:27:06 -0700
commitfd22beb45137e0920e34b03f9067c59a16350669 (patch)
treea2e1ea9a28c0eeeba748e73e4b2f05d17c9b11f9 /Kbuild
parent8dbac2301d9dae0646f7b87e62f8cdee9a6e208b (diff)
x86: fix bad pmd ffff810000207xxx(9090909090909090)
upstream commit: 2884f110d5409714f3a04eeb6d2ecd77da66b242 OGAWA Hirofumi and Fede have reported rare pmd_ERROR messages: mm/memory.c:127: bad pmd ffff810000207xxx(9090909090909090). Initialization's cleanup_highmap was leaving alignment filler behind in the pmd for MODULES_VADDR: when vmalloc's guard page would occupy a new page table, it's not allocated, and then module unload's vfree hits the bad 9090 pmd entry left over. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Hugh notes: It's actually not a serious problem, but it does look as if it's a serious problem, so we should stamp it out. Signed-off-by: Chris Wright <chrisw@sous-sol.org>
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