21 Sep, 2009

1 commit


15 Jun, 2009

1 commit


03 Apr, 2009

1 commit

  • This fixes a build failure with generic debug pagealloc:

    mm/debug-pagealloc.c: In function 'set_page_poison':
    mm/debug-pagealloc.c:8: error: 'struct page' has no member named 'debug_flags'
    mm/debug-pagealloc.c: In function 'clear_page_poison':
    mm/debug-pagealloc.c:13: error: 'struct page' has no member named 'debug_flags'
    mm/debug-pagealloc.c: In function 'page_poison':
    mm/debug-pagealloc.c:18: error: 'struct page' has no member named 'debug_flags'
    mm/debug-pagealloc.c: At top level:
    mm/debug-pagealloc.c:120: error: redefinition of 'kernel_map_pages'
    include/linux/mm.h:1278: error: previous definition of 'kernel_map_pages' was here
    mm/debug-pagealloc.c: In function 'kernel_map_pages':
    mm/debug-pagealloc.c:122: error: 'debug_pagealloc_enabled' undeclared (first use in this function)

    by fixing

    - debug_flags should be in struct page
    - define DEBUG_PAGEALLOC config option for all architectures

    Signed-off-by: Akinobu Mita
    Reported-by: Alexander Beregalov
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Akinobu Mita
     

01 Apr, 2009

1 commit

  • CONFIG_DEBUG_PAGEALLOC is now supported by x86, powerpc, sparc64, and
    s390. This patch implements it for the rest of the architectures by
    filling the pages with poison byte patterns after free_pages() and
    verifying the poison patterns before alloc_pages().

    This generic one cannot detect invalid page accesses immediately but
    invalid read access may cause invalid dereference by poisoned memory and
    invalid write access can be detected after a long delay.

    Signed-off-by: Akinobu Mita
    Cc:
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Akinobu Mita