The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x b174f139bdc8aaaf72f5b67ad1bd512c4868a87e # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024061301-runt-mannish-7604@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..
Possible dependencies:
b174f139bdc8 ("mm/cma: drop incorrect alignment check in cma_init_reserved_mem") e16faf26780f ("cma: factor out minimum alignment requirement")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From b174f139bdc8aaaf72f5b67ad1bd512c4868a87e Mon Sep 17 00:00:00 2001 From: Frank van der Linden fvdl@google.com Date: Thu, 4 Apr 2024 16:25:14 +0000 Subject: [PATCH] mm/cma: drop incorrect alignment check in cma_init_reserved_mem
cma_init_reserved_mem uses IS_ALIGNED to check if the size represented by one bit in the cma allocation bitmask is aligned with CMA_MIN_ALIGNMENT_BYTES (pageblock size).
However, this is too strict, as this will fail if order_per_bit > pageblock_order, which is a valid configuration.
We could check IS_ALIGNED both ways, but since both numbers are powers of two, no check is needed at all.
Link: https://lkml.kernel.org/r/20240404162515.527802-1-fvdl@google.com Fixes: de9e14eebf33 ("drivers: dma-contiguous: add initialization from device tree") Signed-off-by: Frank van der Linden fvdl@google.com Acked-by: David Hildenbrand david@redhat.com Cc: Marek Szyprowski m.szyprowski@samsung.com Cc: Muchun Song muchun.song@linux.dev Cc: Roman Gushchin roman.gushchin@linux.dev Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org
diff --git a/mm/cma.c b/mm/cma.c index 01f5a8f71ddf..3e9724716bad 100644 --- a/mm/cma.c +++ b/mm/cma.c @@ -182,10 +182,6 @@ int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, if (!size || !memblock_is_region_reserved(base, size)) return -EINVAL;
- /* alignment should be aligned with order_per_bit */ - if (!IS_ALIGNED(CMA_MIN_ALIGNMENT_PAGES, 1 << order_per_bit)) - return -EINVAL; - /* ensure minimal alignment required by mm core */ if (!IS_ALIGNED(base | size, CMA_MIN_ALIGNMENT_BYTES)) return -EINVAL;