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authorVitaly Wool <vitalywool@gmail.com>2016-06-03 14:55:47 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-06-03 16:02:55 -0700
commit43afc19417ca92cf237095947f597f21d86fd2a7 (patch)
treea9976414d5dab53237a8b283aa5030b16a44adcb /mm/z3fold.c
parent3a06bb78ceeceacc86a1e31133a7944013f9775b (diff)
downloadop-kernel-dev-43afc19417ca92cf237095947f597f21d86fd2a7.zip
op-kernel-dev-43afc19417ca92cf237095947f597f21d86fd2a7.tar.gz
mm/z3fold.c: avoid modifying HEADLESS page and minor cleanup
Fix erroneous z3fold header access in a HEADLESS page in reclaim function, and change one remaining direct handle-to-buddy conversion to use the appropriate helper. Link: http://lkml.kernel.org/r/5748706F.9020208@gmail.com Signed-off-by: Vitaly Wool <vitalywool@gmail.com> Reviewed-by: Dan Streetman <ddstreet@ieee.org> Cc: Seth Jennings <sjenning@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/z3fold.c')
-rw-r--r--mm/z3fold.c24
1 files changed, 14 insertions, 10 deletions
diff --git a/mm/z3fold.c b/mm/z3fold.c
index 34917d5..8f9e89c 100644
--- a/mm/z3fold.c
+++ b/mm/z3fold.c
@@ -412,7 +412,7 @@ static void z3fold_free(struct z3fold_pool *pool, unsigned long handle)
/* HEADLESS page stored */
bud = HEADLESS;
} else {
- bud = (handle - zhdr->first_num) & BUDDY_MASK;
+ bud = handle_to_buddy(handle);
switch (bud) {
case FIRST:
@@ -572,15 +572,19 @@ next:
pool->pages_nr--;
spin_unlock(&pool->lock);
return 0;
- } else if (zhdr->first_chunks != 0 &&
- zhdr->last_chunks != 0 && zhdr->middle_chunks != 0) {
- /* Full, add to buddied list */
- list_add(&zhdr->buddy, &pool->buddied);
- } else if (!test_bit(PAGE_HEADLESS, &page->private)) {
- z3fold_compact_page(zhdr);
- /* add to unbuddied list */
- freechunks = num_free_chunks(zhdr);
- list_add(&zhdr->buddy, &pool->unbuddied[freechunks]);
+ } else if (!test_bit(PAGE_HEADLESS, &page->private)) {
+ if (zhdr->first_chunks != 0 &&
+ zhdr->last_chunks != 0 &&
+ zhdr->middle_chunks != 0) {
+ /* Full, add to buddied list */
+ list_add(&zhdr->buddy, &pool->buddied);
+ } else {
+ z3fold_compact_page(zhdr);
+ /* add to unbuddied list */
+ freechunks = num_free_chunks(zhdr);
+ list_add(&zhdr->buddy,
+ &pool->unbuddied[freechunks]);
+ }
}
/* add to beginning of LRU */
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