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dax fix 5.4-rc5

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- Fix a performance regression that followed from a fix to the
   conversion of the fsdax implementation to the xarray. v5.3 users
   report that they stop seeing huge page mappings on an application +
   filesystem layout that was seeing huge pages previously on v5.2.
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Merge tag 'dax-fix-5.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull dax fix from Dan Williams:
 "Fix a performance regression that followed from a fix to the
  conversion of the fsdax implementation to the xarray. v5.3 users
  report that they stop seeing huge page mappings on an application +
  filesystem layout that was seeing huge pages previously on v5.2"

* tag 'dax-fix-5.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  fs/dax: Fix pmd vs pte conflict detection
This commit is contained in:
Linus Torvalds 2019-10-26 06:26:04 -04:00
commit 485fc4b69c
1 changed files with 3 additions and 2 deletions
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5
fs/dax.c
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@ -220,10 +220,11 @@ static void *get_unlocked_entry(struct xa_state *xas, unsigned int order)
for (;;) {
entry = xas_find_conflict(xas);
if (!entry || WARN_ON_ONCE(!xa_is_value(entry)))
return entry;
if (dax_entry_order(entry) < order)
return XA_RETRY_ENTRY;
if (!entry || WARN_ON_ONCE(!xa_is_value(entry)) ||
!dax_is_locked(entry))
if (!dax_is_locked(entry))
return entry;
wq = dax_entry_waitqueue(xas, entry, &ewait.key);