lkml.org 
[lkml]   [2022]   [Feb]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 2/6] dax: fix cache flush on PMD-mapped pages
Date
The flush_cache_page() only remove a PAGE_SIZE sized range from the cache.
However, it does not cover the full pages in a THP except a head page.
Replace it with flush_cache_range() to fix this issue.

Fixes: f729c8c9b24f ("dax: wrprotect pmd_t in dax_mapping_entry_mkclean")
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
fs/dax.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/dax.c b/fs/dax.c
index 88be1c02a151..e031e4b6c13c 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -857,7 +857,8 @@ static void dax_entry_mkclean(struct address_space *mapping, pgoff_t index,
if (!pmd_dirty(*pmdp) && !pmd_write(*pmdp))
goto unlock_pmd;

- flush_cache_page(vma, address, pfn);
+ flush_cache_range(vma, address,
+ address + HPAGE_PMD_SIZE);
pmd = pmdp_invalidate(vma, address, pmdp);
pmd = pmd_wrprotect(pmd);
pmd = pmd_mkclean(pmd);
--
2.11.0
\
 
 \ /
  Last update: 2022-02-02 15:34    [W:0.061 / U:0.112 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site