• Ross Zwisler's avatar
    pmem: add wb_cache_pmem() to the PMEM API · 3f4a2670
    Ross Zwisler authored
    __arch_wb_cache_pmem() was already an internal implementation detail of
    the x86 PMEM API, but this functionality needs to be exported as part of
    the general PMEM API to handle the fsync/msync case for DAX mmaps.
    
    One thing worth noting is that we really do want this to be part of the
    PMEM API as opposed to a stand-alone function like clflush_cache_range()
    because of ordering restrictions.  By having wb_cache_pmem() as part of
    the PMEM API we can leave it unordered, call it multiple times to write
    back large amounts of memory, and then order the multiple calls with a
    single wmb_pmem().
    Signed-off-by: default avatarRoss Zwisler <ross.zwisler@linux.intel.com>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: "J. Bruce Fields" <bfields@fieldses.org>
    Cc: "Theodore Ts'o" <tytso@mit.edu>
    Cc: Alexander Viro <viro@zeniv.linux.org.uk>
    Cc: Andreas Dilger <adilger.kernel@dilger.ca>
    Cc: Dave Chinner <david@fromorbit.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Jan Kara <jack@suse.com>
    Cc: Jeff Layton <jlayton@poochiereds.net>
    Cc: Matthew Wilcox <willy@linux.intel.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Dan Williams <dan.j.williams@intel.com>
    Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    3f4a2670
pmem.h 4.38 KB