[PATCH] x86_64: Fix change_page_attr cache flushing

Noticed by Terence Ripperda

Undo wrong change in global_flush_tlb. We need to flush the caches in all
cases, not just when pages were reverted. This was a bogus optimization
added earlier, but it was wrong.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/x86_64/mm/pageattr.c b/arch/x86_64/mm/pageattr.c
index 94862e1ec032d2616ca270071e70fb523e1aa150..b90e8fe9eeb00509da9cbda82aa45034e38a64c2 100644 (file)
--- a/arch/x86_64/mm/pageattr.c
+++ b/arch/x86_64/mm/pageattr.c
@@ -220,8 +220,6 @@ void global_flush_tlb(void)
        down_read(&init_mm.mmap_sem);
        df = xchg(&df_list, NULL);
        up_read(&init_mm.mmap_sem);
-       if (!df)
-               return;
        flush_map((df && !df->next) ? df->address : 0);
        for (; df; df = next_df) { 
                next_df = df->next;