lkml.org 
[lkml]   [2019]   [Aug]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    Subject[PATCH] mm: replace is_zero_pfn with is_huge_zero_pmd for thp
    From
    For hugely mapped thp, we use is_huge_zero_pmd() to check if it's
    zero page or not.

    We do fill ptes with my_zero_pfn() when we split zero thp pmd, but
    this is not what we have in vm_normal_page_pmd().
    pmd_trans_huge_lock() makes sure of it.

    This is a trivial fix for /proc/pid/numa_maps, and AFAIK nobody
    complains about it.

    Signed-off-by: Yu Zhao <yuzhao@google.com>
    ---
    mm/memory.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/mm/memory.c b/mm/memory.c
    index e2bb51b6242e..ea3c74855b23 100644
    --- a/mm/memory.c
    +++ b/mm/memory.c
    @@ -654,7 +654,7 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,

    if (pmd_devmap(pmd))
    return NULL;
    - if (is_zero_pfn(pfn))
    + if (is_huge_zero_pmd(pmd))
    return NULL;
    if (unlikely(pfn > highest_memmap_pfn))
    return NULL;
    --
    2.23.0.187.g17f5b7556c-goog
    \
     
     \ /
      Last update: 2019-08-25 22:07    [W:3.028 / U:0.024 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site