lkml.org 
[lkml]   [2013]   [Jan]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 03/17] mm/page_alloc: add a VM_BUG in __free_one_page() if the zone is uninitialized.
    Date
    From: Cody P Schafer <jmesmon@gmail.com>

    Freeing pages to uninitialized zones is not handled by
    __free_one_page(), and should never happen when the code is correct.

    Ran into this while writing some code that dynamically onlines extra
    zones.

    Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
    ---
    mm/page_alloc.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/mm/page_alloc.c b/mm/page_alloc.c
    index df2022f..da5a5ec 100644
    --- a/mm/page_alloc.c
    +++ b/mm/page_alloc.c
    @@ -532,6 +532,8 @@ static inline void __free_one_page(struct page *page,
    unsigned long uninitialized_var(buddy_idx);
    struct page *buddy;

    + VM_BUG_ON(!zone_is_initialized(zone));
    +
    if (unlikely(PageCompound(page)))
    if (unlikely(destroy_compound_page(page, order)))
    return;
    --
    1.8.0.3


    \
     
     \ /
      Last update: 2013-01-16 03:21    [W:7.388 / U:0.164 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site