mm/cma: drop incorrect alignment check in cma_init_reserved_mem

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Frank van der Linden <fvdl@xxxxxxxxxx>

commit b174f139bdc8aaaf72f5b67ad1bd512c4868a87e upstream.

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@xxxxxxxxxx
Fixes: de9e14eebf33 ("drivers: dma-contiguous: add initialization from device tree")
Signed-off-by: Frank van der Linden <fvdl@xxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 mm/cma.c |    4 ----
 1 file changed, 4 deletions(-)

--- a/mm/cma.c
+++ b/mm/cma.c
@@ -186,10 +186,6 @@ int __init cma_init_reserved_mem(phys_ad
 	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;


Patches currently in stable-queue which might be from fvdl@xxxxxxxxxx are

queue-6.1/mm-hugetlb-pass-correct-order_per_bit-to-cma_declare_contiguous_nid.patch
queue-6.1/mm-cma-drop-incorrect-alignment-check-in-cma_init_reserved_mem.patch




[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux