| Message ID | 20220318074529.5261-2-songmuchun@bytedance.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Fix some bugs related to ramp and dax | expand |
On Fri, Mar 18, 2022 at 03:45:24PM +0800, Muchun Song wrote: > 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. At least, no > problems were found due to this. Maybe because the architectures that > have virtual indexed caches is less. > > Fixes: f27176cfc363 ("mm: convert page_mkclean_one() to use page_vma_mapped_walk()") > Signed-off-by: Muchun Song <songmuchun@bytedance.com> > Reviewed-by: Yang Shi <shy828301@gmail.com> > Reviewed-by: Dan Williams <dan.j.williams@intel.com> Looks good: Reviewed-by: Christoph Hellwig <hch@lst.de>
diff --git a/mm/rmap.c b/mm/rmap.c index fc46a3d7b704..723682ddb9e8 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -970,7 +970,8 @@ static bool page_mkclean_one(struct folio *folio, struct vm_area_struct *vma, if (!pmd_dirty(*pmd) && !pmd_write(*pmd)) continue; - flush_cache_page(vma, address, folio_pfn(folio)); + flush_cache_range(vma, address, + address + HPAGE_PMD_SIZE); entry = pmdp_invalidate(vma, address, pmd); entry = pmd_wrprotect(entry); entry = pmd_mkclean(entry);
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. At least, no problems were found due to this. Maybe because the architectures that have virtual indexed caches is less. Fixes: f27176cfc363 ("mm: convert page_mkclean_one() to use page_vma_mapped_walk()") Signed-off-by: Muchun Song <songmuchun@bytedance.com> Reviewed-by: Yang Shi <shy828301@gmail.com> Reviewed-by: Dan Williams <dan.j.williams@intel.com> --- mm/rmap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)