diff options
author | Christoph Lameter <cl@linux.com> | 2012-09-05 04:20:33 +0400 |
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committer | Pekka Enberg <penberg@kernel.org> | 2012-09-05 13:00:35 +0400 |
commit | 686d550d222e8f83f6e709debbedf9d8ef77aec7 (patch) | |
tree | eb1a33c0a401c7fd9c22464a88c3c87fbfc8808d /mm | |
parent | 208c4358dc4a8f0fe99e49eb8d21a869b01e7d34 (diff) | |
download | linux-686d550d222e8f83f6e709debbedf9d8ef77aec7.tar.xz |
mm/slab_common: Improve error handling in kmem_cache_create
Instead of using s == NULL use an errorcode. This allows much more
detailed diagnostics as to what went wrong. As we add more functionality
from the slab allocators to the common kmem_cache_create() function we will
also add more error conditions.
Print the error code during the panic as well as in a warning if the module
can handle failure. The API for kmem_cache_create() currently does not allow
the returning of an error code. Return NULL but log the cause of the problem
in the syslog.
Reviewed-by: Glauber Costa <glommer@parallels.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/slab_common.c | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c index 8cf8b4962d6c..fe8dc943c285 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -98,16 +98,36 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align unsigned long flags, void (*ctor)(void *)) { struct kmem_cache *s = NULL; + int err = 0; get_online_cpus(); mutex_lock(&slab_mutex); - if (kmem_cache_sanity_check(name, size) == 0) - s = __kmem_cache_create(name, size, align, flags, ctor); + + if (!kmem_cache_sanity_check(name, size) == 0) + goto out_locked; + + + s = __kmem_cache_create(name, size, align, flags, ctor); + if (!s) + err = -ENOSYS; /* Until __kmem_cache_create returns code */ + +out_locked: mutex_unlock(&slab_mutex); put_online_cpus(); - if (!s && (flags & SLAB_PANIC)) - panic("kmem_cache_create: Failed to create slab '%s'\n", name); + if (err) { + + if (flags & SLAB_PANIC) + panic("kmem_cache_create: Failed to create slab '%s'. Error %d\n", + name, err); + else { + printk(KERN_WARNING "kmem_cache_create(%s) failed with error %d", + name, err); + dump_stack(); + } + + return NULL; + } return s; } |