6.11-stable review patch. If anyone has any objections, please let me know.
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From: Masami Hiramatsu (Google) mhiramat@kernel.org
commit cb6fcef8b4b6c655b6a25cc3a415cd9eb81b3da8 upstream.
Since gfp & GFP_ATOMIC == GFP_ATOMIC is true for GFP_KERNEL | GFP_HIGH, it will use kmalloc if user specifies that combination. Here the reason why combining the __vmalloc_node() and kmalloc_node() is that the vmalloc does not support all GFP flag, especially GFP_ATOMIC. So we should check if gfp & (GFP_ATOMIC | GFP_KERNEL) != GFP_ATOMIC for vmalloc first. This ensures caller can sleep. And for the robustness, even if vmalloc fails, it should retry with kmalloc to allocate it.
Link: https://lkml.kernel.org/r/173008598713.1262174.2959179484209897252.stgit@mhi... Fixes: aff1871bfc81 ("objpool: fix choosing allocation for percpu slots") Signed-off-by: Masami Hiramatsu (Google) mhiramat@kernel.org Reported-by: Linus Torvalds torvalds@linux-foundation.org Closes: https://lore.kernel.org/all/CAHk-=whO+vSH+XVRio8byJU8idAWES0SPGVZ7KAVdc4qrV0... Cc: Leo Yan leo.yan@arm.com Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Matt Wu wuqiang.matt@bytedance.com Cc: Mikel Rychliski mikel@mikelr.com Cc: Steven Rostedt (Google) rostedt@goodmis.org Cc: Viktor Malik vmalik@redhat.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- lib/objpool.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/lib/objpool.c b/lib/objpool.c index fd108fe0d095..b998b720c732 100644 --- a/lib/objpool.c +++ b/lib/objpool.c @@ -74,15 +74,21 @@ objpool_init_percpu_slots(struct objpool_head *pool, int nr_objs, * warm caches and TLB hits. in default vmalloc is used to * reduce the pressure of kernel slab system. as we know, * mimimal size of vmalloc is one page since vmalloc would - * always align the requested size to page size + * always align the requested size to page size. + * but if vmalloc fails or it is not available (e.g. GFP_ATOMIC) + * allocate percpu slot with kmalloc. */ - if ((pool->gfp & GFP_ATOMIC) == GFP_ATOMIC) - slot = kmalloc_node(size, pool->gfp, cpu_to_node(i)); - else + slot = NULL; + + if ((pool->gfp & (GFP_ATOMIC | GFP_KERNEL)) != GFP_ATOMIC) slot = __vmalloc_node(size, sizeof(void *), pool->gfp, cpu_to_node(i), __builtin_return_address(0)); - if (!slot) - return -ENOMEM; + + if (!slot) { + slot = kmalloc_node(size, pool->gfp, cpu_to_node(i)); + if (!slot) + return -ENOMEM; + } memset(slot, 0, size); pool->cpu_slots[i] = slot;