]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
pmem: add wb_cache_pmem() to the PMEM API
authorRoss Zwisler <ross.zwisler@linux.intel.com>
Fri, 22 Jan 2016 23:10:37 +0000 (15:10 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 23 Jan 2016 01:02:18 +0000 (17:02 -0800)
commit3f4a2670deea53e3765e24a7f46aafe6f077cb68
tree1fcaf61e9a5c1a626e58a2ed25c7c8f7d46324b1
parentde14b9cb5e02b5daaea139590393af5ccccc4229
pmem: add wb_cache_pmem() to the PMEM API

__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: Ross 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/x86/include/asm/pmem.h
include/linux/pmem.h