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authorHugh Dickins <hughd@google.com>2017-02-07 22:11:16 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-07 23:08:32 +0300
commitb6789123bccba8b5feb9901ed2e8c3c39181979d (patch)
tree91243683ee007ed611fa01a3cbb89fc814fcb3db /fs/proc
parenta524c218bc94c705886a0e0fedeee45d1931da32 (diff)
downloadlinux-b6789123bccba8b5feb9901ed2e8c3c39181979d.tar.xz
mm: fix KPF_SWAPCACHE in /proc/kpageflags
Commit 6326fec1122c ("mm: Use owner_priv bit for PageSwapCache, valid when PageSwapBacked") aliased PG_swapcache to PG_owner_priv_1 (and depending on PageSwapBacked being true). As a result, the KPF_SWAPCACHE bit in '/proc/kpageflags' should now be synthesized, instead of being shown on unrelated pages which just happen to have PG_owner_priv_1 set. Signed-off-by: Hugh Dickins <hughd@google.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/page.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/proc/page.c b/fs/proc/page.c
index a2066e6dee90..2726536489b1 100644
--- a/fs/proc/page.c
+++ b/fs/proc/page.c
@@ -173,7 +173,8 @@ u64 stable_page_flags(struct page *page)
u |= kpf_copy_bit(k, KPF_ACTIVE, PG_active);
u |= kpf_copy_bit(k, KPF_RECLAIM, PG_reclaim);
- u |= kpf_copy_bit(k, KPF_SWAPCACHE, PG_swapcache);
+ if (PageSwapCache(page))
+ u |= 1 << KPF_SWAPCACHE;
u |= kpf_copy_bit(k, KPF_SWAPBACKED, PG_swapbacked);
u |= kpf_copy_bit(k, KPF_UNEVICTABLE, PG_unevictable);