The patch titled
Subject: mm, cma: fix 32-bit warning
has been added to the -mm mm-unstable branch. Its filename is
mm-cma-support-multiple-contiguous-ranges-if-requested-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-cma-support-multiple-contiguous-ranges-if-requested-fix.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Arnd Bergmann <arnd@xxxxxxxx>
Subject: mm, cma: fix 32-bit warning
Date: Mon, 24 Feb 2025 15:07:35 +0100
clang warns about certain always-true conditions, like this one on 32-bit
builds:
mm/cma.c:420:13: error: result of comparison of constant 4294967296 with expression of type 'phys_addr_t' (aka 'unsigned int') is always true [-Werror,-Wtautological-constant-out-of-range-compare]
420 | if (start < SZ_4G)
| ~~~~~ ^ ~~~~~
Replace this one with an equivalent expression that does not cause a warning.
Link: https://lkml.kernel.org/r/20250224141120.1240534-1-arnd@xxxxxxxxxx
Fixes: 4765deffa0f7 ("mm, cma: support multiple contiguous ranges, if requested")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Reviewed-by: Zi Yan <ziy@xxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Frank van der Linden <fvdl@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/cma.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/cma.c~mm-cma-support-multiple-contiguous-ranges-if-requested-fix
+++ a/mm/cma.c
@@ -378,7 +378,7 @@ int __init cma_declare_contiguous_multi(
* Create a list of ranges above 4G, largest range first.
*/
for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &start, &end, NULL) {
- if (start < SZ_4G)
+ if (upper_32_bits(start) == 0)
continue;
start = ALIGN(start, align);
_
Patches currently in -mm which might be from arnd@xxxxxxxx are
mm-cma-support-multiple-contiguous-ranges-if-requested-fix.patch
reboot-add-support-for-configuring-emergency-hardware-protection-action-fix.patch
