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| author | Maxime Ripard <[email protected]> | 2021-04-26 12:03:09 +0000 |
|---|---|---|
| committer | Maxime Ripard <[email protected]> | 2021-04-26 12:03:09 +0000 |
| commit | 355b60296143a090039211c5f0e1463f84aab65a (patch) | |
| tree | b74d4ef2aea66252ea9cf77c847de6c6e72a02b7 /mm/z3fold.c | |
| parent | drm: Remove DRM_KMS_FB_HELPER Kconfig option (diff) | |
| parent | Merge tag 'drm-misc-next-fixes-2021-04-22' of git://anongit.freedesktop.org/d... (diff) | |
| download | kernel-355b60296143a090039211c5f0e1463f84aab65a.tar.gz kernel-355b60296143a090039211c5f0e1463f84aab65a.zip | |
Merge drm/drm-next into drm-misc-next
Christian needs some patches from drm/next
Signed-off-by: Maxime Ripard <[email protected]>
Diffstat (limited to 'mm/z3fold.c')
| -rw-r--r-- | mm/z3fold.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/mm/z3fold.c b/mm/z3fold.c index b5dafa7e44e4..9d889ad2bb86 100644 --- a/mm/z3fold.c +++ b/mm/z3fold.c @@ -1346,8 +1346,22 @@ static int z3fold_reclaim_page(struct z3fold_pool *pool, unsigned int retries) page = list_entry(pos, struct page, lru); zhdr = page_address(page); - if (test_bit(PAGE_HEADLESS, &page->private)) + if (test_bit(PAGE_HEADLESS, &page->private)) { + /* + * For non-headless pages, we wait to do this + * until we have the page lock to avoid racing + * with __z3fold_alloc(). Headless pages don't + * have a lock (and __z3fold_alloc() will never + * see them), but we still need to test and set + * PAGE_CLAIMED to avoid racing with + * z3fold_free(), so just do it now before + * leaving the loop. + */ + if (test_and_set_bit(PAGE_CLAIMED, &page->private)) + continue; + break; + } if (kref_get_unless_zero(&zhdr->refcount) == 0) { zhdr = NULL; |