path: root/mm
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authorDan Williams <dan.j.williams@intel.com>2018-07-13 21:50:01 -0700
committerDave Jiang <dave.jiang@intel.com>2018-07-23 10:37:39 -0700
commit2fa147bdbf672c53386a8f5f2c7fe358004c3ef8 (patch)
tree7cf0718fabe780c0faf9337a6f8262826cb1dc37 /mm
parentmm, madvise_inject_error: Disable MADV_SOFT_OFFLINE for ZONE_DEVICE pages (diff)
mm, dev_pagemap: Do not clear ->mapping on final put
MEMORY_DEVICE_FS_DAX relies on typical page semantics whereby ->mapping is only ever cleared by truncation, not final put. Without this fix dax pages may forget their mapping association at the end of every page pin event. Move this atypical behavior that HMM wants into the HMM ->page_free() callback. Cc: <stable@vger.kernel.org> Cc: Jan Kara <jack@suse.cz> Cc: Jérôme Glisse <jglisse@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Fixes: d2c997c0f145 ("fs, dax: use page->mapping...") Signed-off-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Jérôme Glisse <jglisse@redhat.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Diffstat (limited to '')
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/hmm.c b/mm/hmm.c
index de7b6bf77201..f9d1d89dec4d 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -963,6 +963,8 @@ static void hmm_devmem_free(struct page *page, void *data)
struct hmm_devmem *devmem = data;
+ page->mapping = NULL;
devmem->ops->free(devmem, page);