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Commit 2884f110 authored by Hugh Dickins's avatar Hugh Dickins Committed by Thomas Gleixner
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x86: fix bad pmd ffff810000207xxx(9090909090909090) 



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: default avatarHugh Dickins <hugh@veritas.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 226e9a93

arch/x86/mm/init_64.c

+1 −1
Original line number Diff line number Diff line
@@ -206,7 +206,7 @@ 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));