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| author |   Matthew Wilcox <willy@linux.intel.com> | 2015-09-08 14:59:37 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-08 15:35:28 -0700 |
| commit | 73a6ec47f68787df1b41869def52915da2f4a6b7 (patch) | |
| tree | cbc6d973dbe88c0d397a62167bd5d3d66337ba40 /mm | |
| parent | dax: don't use set_huge_zero_page() (diff) | |
| download | wireguard-linux-73a6ec47f68787df1b41869def52915da2f4a6b7.tar.xz wireguard-linux-73a6ec47f68787df1b41869def52915da2f4a6b7.zip | |
dax: ensure that zero pages are removed from other processes
If the first access to a huge page was a store, there would be no existing
zero pmd in this process's page tables. There could be a zero pmd in
another process's page tables, if it had done a load. We can detect this
case by noticing that the buffer_head returned from the filesystem is New,
and ensure that other processes mapping this huge page have their page
tables flushed.
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Reported-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions