This is a note to let you know that I've just added the patch titled
minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp()
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
minmax.h-use-build_bug_on_msg-for-the-lo-hi-test-in-clamp.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From [email protected] Fri Oct 17 11:13:15 2025
From: Eliav Farber <[email protected]>
Date: Fri, 17 Oct 2025 09:05:16 +0000
Subject: minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp()
To: <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <rajur@chelsio
.com>, <[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>, <tipc-discussion@
lists.sourceforge.net>
Cc: Arnd Bergmann <[email protected]>, Christoph Hellwig <[email protected]>,
Dan Carpenter <[email protected]>, Jens Axboe <[email protected]>, Lorenzo
Stoakes <[email protected]>, Mateusz Guzik <[email protected]>, Pedro
Falcato <[email protected]>
Message-ID: <[email protected]>
From: David Laight <[email protected]>
[ Upstream commit a5743f32baec4728711bbc01d6ac2b33d4c67040 ]
Use BUILD_BUG_ON_MSG(statically_true(ulo > uhi), ...) for the sanity check
of the bounds in clamp(). Gives better error coverage and one less
expansion of the arguments.
Link:
https://lkml.kernel.org/r/[email protected]
Signed-off-by: David Laight <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Dan Carpenter <[email protected]>
Cc: Jason A. Donenfeld <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: Mateusz Guzik <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Pedro Falcato <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Eliav Farber <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
include/linux/minmax.h | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/include/linux/minmax.h
+++ b/include/linux/minmax.h
@@ -106,8 +106,7 @@
__auto_type uval = (val);
\
__auto_type ulo = (lo);
\
__auto_type uhi = (hi);
\
- static_assert(__builtin_choose_expr(__is_constexpr((lo) > (hi)),
\
- (lo) <= (hi), true),
\
+ BUILD_BUG_ON_MSG(statically_true(ulo > uhi),
\
"clamp() low limit " #lo " greater than high limit " #hi);
\
BUILD_BUG_ON_MSG(!__types_ok3(uval, ulo, uhi),
\
"clamp("#val", "#lo", "#hi") signedness error");
\
Patches currently in stable-queue which might be from [email protected] are
queue-5.10/minmax-allow-comparisons-of-int-against-unsigned-char-short.patch
queue-5.10/minmax-add-a-few-more-min_t-max_t-users.patch
queue-5.10/minmax-improve-macro-expansion-and-type-checking.patch
queue-5.10/minmax-fix-indentation-of-__cmp_once-and-__clamp_once.patch
queue-5.10/minmax.h-simplify-the-variants-of-clamp.patch
queue-5.10/minmax-add-in_range-macro.patch
queue-5.10/minmax.h-move-all-the-clamp-definitions-after-the-min-max-ones.patch
queue-5.10/minmax-allow-min-max-clamp-if-the-arguments-have-the-same-signedness.patch
queue-5.10/minmax-don-t-use-max-in-situations-that-want-a-c-constant-expression.patch
queue-5.10/minmax.h-remove-some-defines-that-are-only-expanded-once.patch
queue-5.10/minmax.h-use-build_bug_on_msg-for-the-lo-hi-test-in-clamp.patch
queue-5.10/minmax-simplify-min-max-clamp-implementation.patch
queue-5.10/minmax-deduplicate-__unconst_integer_typeof.patch
queue-5.10/minmax-simplify-and-clarify-min_t-max_t-implementation.patch
queue-5.10/minmax.h-add-whitespace-around-operators-and-after-commas.patch
queue-5.10/minmax-sanity-check-constant-bounds-when-clamping.patch
queue-5.10/minmax-avoid-overly-complicated-constant-expressions-in-vm-code.patch
queue-5.10/minmax-make-generic-min-and-max-macros-available-everywhere.patch
queue-5.10/minmax-fix-up-min3-and-max3-too.patch
queue-5.10/minmax.h-reduce-the-define-expansion-of-min-max-and-clamp.patch
queue-5.10/minmax-fix-header-inclusions.patch
queue-5.10/minmax-introduce-min-max-_array.patch
queue-5.10/btrfs-remove-duplicated-in_range-macro.patch
queue-5.10/overflow-tracing-define-the-is_signed_type-macro-once.patch
queue-5.10/minmax-relax-check-to-allow-comparison-between-unsigned-arguments-and-signed-constants.patch
queue-5.10/minmax-clamp-more-efficiently-by-avoiding-extra-comparison.patch
queue-5.10/minmax.h-update-some-comments.patch
