diff options
| author | Eric Farman <[email protected]> | 2020-10-02 22:21:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2020-10-03 11:28:12 -0700 |
| commit | 484cfaca95925f1a38ded6d0561de06a70409a32 (patch) | |
| tree | 312ec6886d3d16757f1bfdc8b8ccf2f760037752 | |
| parent | d3d45f8220d60a0b2aaaacf8fb2be4e6ffd9008e (diff) | |
mm, slub: restore initial kmem_cache flags
The routine that applies debug flags to the kmem_cache slabs
inadvertantly prevents non-debug flags from being applied to those
same objects. That is, if slub_debug=<flag>,<slab> is specified,
non-debugged slabs will end up having flags of zero, and the slabs
may be unusable.
Fix this by including the input flags for non-matching slabs with the
contents of slub_debug, so that the caches are created as expected
alongside any debugging options that may be requested. With this, we
can remove the check for a NULL slub_debug_string, since it's covered
by the loop itself.
Fixes: e17f1dfba37b ("mm, slub: extend slub_debug syntax for multiple blocks")
Signed-off-by: Eric Farman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | mm/slub.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/mm/slub.c b/mm/slub.c index d4177aecedf6..6d3574013b2f 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1413,10 +1413,6 @@ slab_flags_t kmem_cache_flags(unsigned int object_size, char *next_block; slab_flags_t block_flags; - /* If slub_debug = 0, it folds into the if conditional. */ - if (!slub_debug_string) - return flags | slub_debug; - len = strlen(name); next_block = slub_debug_string; /* Go through all blocks of debug options, see if any matches our slab's name */ @@ -1450,7 +1446,7 @@ slab_flags_t kmem_cache_flags(unsigned int object_size, } } - return slub_debug; + return flags | slub_debug; } #else /* !CONFIG_SLUB_DEBUG */ static inline void setup_object_debug(struct kmem_cache *s, |