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    block: add helpers to run flush_dcache_page() against a bio and a request's pages · 2d4dc890
    Ilya Loginov 提交于
    Mtdblock driver doesn't call flush_dcache_page for pages in request.  So,
    this causes problems on architectures where the icache doesn't fill from
    the dcache or with dcache aliases.  The patch fixes this.
    
    The ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE symbol was introduced to avoid
    pointless empty cache-thrashing loops on architectures for which
    flush_dcache_page() is a no-op.  Every architecture was provided with this
    flush pages on architectires where ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE is
    equal 1 or do nothing otherwise.
    
    See "fix mtd_blkdevs problem with caches on some architectures" discussion
    on LKML for more information.
    Signed-off-by: NIlya Loginov <isloginov@gmail.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: David Woodhouse <dwmw2@infradead.org>
    Cc: Peter Horton <phorton@bitbox.co.uk>
    Cc: "Ed L. Cashin" <ecashin@coraid.com>
    Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
    2d4dc890
cacheflush.h 3.9 KB