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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
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>
-rw-r--r--arch/x86/mm/init_64.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index a02a14f0f324..b2c5231c4686 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -192,7 +192,7 @@ void __init cleanup_highmap(void)
pmd_t *last_pmd = pmd + PTRS_PER_PMD;
for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
- if (!pmd_present(*pmd))
+ if (pmd_none(*pmd))
continue;
if (vaddr < (unsigned long) _text || vaddr > end)
set_pmd(pmd, __pmd(0));