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| author | Marco Elver <elver@google.com> | 2025-01-24 13:01:38 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-21 13:49:48 +0100 |
| commit | 621b80eb88d7bd94e40e7b0234c6efce971b2edd (patch) | |
| tree | 0d091f2a5a71af4a49f7d167a6f4ff9df80192ea /mm | |
| parent | aa2ed4ee8d688e9e188274149b26b5de5955f4b7 (diff) | |
| download | linux-621b80eb88d7bd94e40e7b0234c6efce971b2edd.tar.gz linux-621b80eb88d7bd94e40e7b0234c6efce971b2edd.tar.bz2 linux-621b80eb88d7bd94e40e7b0234c6efce971b2edd.zip | |
kfence: skip __GFP_THISNODE allocations on NUMA systems
commit e64f81946adf68cd75e2207dd9a51668348a4af8 upstream.
On NUMA systems, __GFP_THISNODE indicates that an allocation _must_ be on
a particular node, and failure to allocate on the desired node will result
in a failed allocation.
Skip __GFP_THISNODE allocations if we are running on a NUMA system, since
KFENCE can't guarantee which node its pool pages are allocated on.
Link: https://lkml.kernel.org/r/20250124120145.410066-1-elver@google.com
Fixes: 236e9f153852 ("kfence: skip all GFP_ZONEMASK allocations")
Signed-off-by: Marco Elver <elver@google.com>
Reported-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Chistoph Lameter <cl@linux.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/kfence/core.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/kfence/core.c b/mm/kfence/core.c index c597cfebb0e8..799d8503f35f 100644 --- a/mm/kfence/core.c +++ b/mm/kfence/core.c @@ -21,6 +21,7 @@ #include <linux/log2.h> #include <linux/memblock.h> #include <linux/moduleparam.h> +#include <linux/nodemask.h> #include <linux/notifier.h> #include <linux/panic_notifier.h> #include <linux/random.h> @@ -997,6 +998,7 @@ void *__kfence_alloc(struct kmem_cache *s, size_t size, gfp_t flags) * properties (e.g. reside in DMAable memory). */ if ((flags & GFP_ZONEMASK) || + ((flags & __GFP_THISNODE) && num_online_nodes() > 1) || (s->flags & (SLAB_CACHE_DMA | SLAB_CACHE_DMA32))) { atomic_long_inc(&counters[KFENCE_COUNTER_SKIP_INCOMPAT]); return NULL; |