This is a note to let you know that I've just added the patch titled

percpu: don't forget to free the temporary struct pcpu_alloc_info

to the 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: percpu-don-t-forget-to-free-the-temporary-struct-pcpu_alloc_info.patch and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Thu Dec 21 10:55:04 CET 2017

From: Nicolas Pitre nicolas.pitre@linaro.org Date: Tue, 3 Oct 2017 18:29:49 -0400 Subject: percpu: don't forget to free the temporary struct pcpu_alloc_info

From: Nicolas Pitre nicolas.pitre@linaro.org

[ Upstream commit 438a50618095061920d3a30d4c5ca1ef2e0ff860 ]

Unlike the SMP case, the !SMP case does not free the memory for struct pcpu_alloc_info allocated in setup_per_cpu_areas(). And to give it a chance of being reused by the page allocator later, align it to a page boundary just like its size.

Signed-off-by: Nicolas Pitre nico@linaro.org Acked-by: Dennis Zhou dennisszhou@gmail.com Signed-off-by: Tejun Heo tj@kernel.org Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- mm/percpu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/mm/percpu.c +++ b/mm/percpu.c @@ -1402,7 +1402,7 @@ struct pcpu_alloc_info * __init pcpu_all __alignof__(ai->groups[0].cpu_map[0])); ai_size = base_size + nr_units * sizeof(ai->groups[0].cpu_map[0]);

- ptr = memblock_virt_alloc_nopanic(PFN_ALIGN(ai_size), 0); + ptr = memblock_virt_alloc_nopanic(PFN_ALIGN(ai_size), PAGE_SIZE); if (!ptr) return NULL; ai = ptr; @@ -2268,6 +2268,7 @@ void __init setup_per_cpu_areas(void)

if (pcpu_setup_first_chunk(ai, fc) < 0) panic("Failed to initialize percpu areas."); + pcpu_free_alloc_info(ai); }

#endif /* CONFIG_SMP */

Patches currently in stable-queue which might be from nicolas.pitre@linaro.org are

queue-3.18/percpu-don-t-forget-to-free-the-temporary-struct-pcpu_alloc_info.patch