x86, mm: Make spurious_fault check explicitly check the PRESENT bit

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pte_present() returns true even present bit isn't set but _PAGE_PROTNONE
(global bit) bit is set. While with CONFIG_DEBUG_PAGEALLOC, free pages have
global bit set but present bit clear. This patch makes we could catch
free pages access with CONFIG_DEBUG_PAGEALLOC enabled.

[ hpa: added a comment in the code as a warning to janitors ]

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
LKML-Reference: <1280217988.32400.75.camel@sli10-desk.sh.intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

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Shaohua Li 2010-07-27 16:06:28 +08:00 • committed by H. Peter Anvin

parent 9b861528a8

commit 660a293ea9

1 changed files with 7 additions and 1 deletions

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arch/x86/mm/fault.c

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