Commit-ID: 957561ec0fa8a701f60ca6a0f40cc46f5c554920 Gitweb: http://git.kernel.org/tip/957561ec0fa8a701f60ca6a0f40cc46f5c554920 Author: Toshi Kani <toshi.k...@hp.com> AuthorDate: Thu, 4 Jun 2015 18:55:21 +0200 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Sun, 7 Jun 2015 15:29:01 +0200
drivers/block/pmem: Map NVDIMM in Write-Through mode The pmem driver maps NVDIMM uncacheable so that we don't lose data which hasn't reached non-volatile storage in the case of a crash. Change this to Write-Through mode which provides uncached writes but cached reads, thus improving read performance. Signed-off-by: Toshi Kani <toshi.k...@hp.com> Signed-off-by: Borislav Petkov <b...@suse.de> Acked-by: Dan Williams <dan.j.willi...@intel.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Andy Lutomirski <l...@amacapital.net> Cc: elli...@hp.com Cc: H. Peter Anvin <h...@zytor.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Luis R. Rodriguez <mcg...@suse.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Cc: a...@arndb.de Cc: h...@lst.de Cc: h...@hmh.eng.br Cc: jgr...@suse.com Cc: konrad.w...@oracle.com Cc: linux-mm <linux...@kvack.org> Cc: linux-nvd...@lists.01.org Cc: stefan.ba...@canonical.com Cc: yi...@plexistor.com Link: http://lkml.kernel.org/r/1433436928-31903-14-git-send-email...@alien8.de Signed-off-by: Ingo Molnar <mi...@kernel.org> --- drivers/block/pmem.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/block/pmem.c b/drivers/block/pmem.c index eabf4a8..095dfaa 100644 --- a/drivers/block/pmem.c +++ b/drivers/block/pmem.c @@ -139,11 +139,11 @@ static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res) } /* - * Map the memory as non-cachable, as we can't write back the contents + * Map the memory as write-through, as we can't write back the contents * of the CPU caches in case of a crash. */ err = -ENOMEM; - pmem->virt_addr = ioremap_nocache(pmem->phys_addr, pmem->size); + pmem->virt_addr = ioremap_wt(pmem->phys_addr, pmem->size); if (!pmem->virt_addr) goto out_release_region; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
