[lkml]   [2008]   [Mar]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: 2.6.25-rc7-git2: Reported regressions from 2.6.24

    On Thu, 27 Mar 2008, Christoph Lameter wrote:
    > Slab allocations can never use GFP_HIGHMEM.

    Totally irrelevant.

    The page allocation path does

    if (gfp_flags & __GFP_ZERO)
    prep_zero_page(page, order, gfp_flags);

    and that will cause a warning REGARDLESS of whether the page is a HIGHMEM
    page or not.

    And the fact is, passing in GFP_ZERO from the SLUB code is a bug
    regardless, because it unnecessarily does the dual memset().

    So here's a damn big clue:
    - SLUB does its own GFP_ZERO handling
    - so passing GFP_ZERO down to the page allocator is a f*cking bug
    - and this has NOTHING what-so-ever to do with GFP_HIGHMEM or even
    whether the warning is "valid" or not - it's a bug even if the warning
    had never happened.

    So stop blathering, and just admit that this was buggy. It was also
    fundamentally fragile to leave GFP_ZERO around when it was known to not be
    valid at that point (exactly because GFP_ZERO was handled by the caller).


     \ /
      Last update: 2008-03-28 05:03    [W:0.026 / U:1.384 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site