The patch titled
Subject: minmax: allow comparisons of 'int' against 'unsigned char/short'
has been added to the -mm mm-nonmm-unstable branch. Its filename is
minmax-allow-comparisons-of-int-against-unsigned-char-short.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/minmax-allow-comparisons-of-int-against-unsigned-char-short.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: David Laight <David.Laight@xxxxxxxxxx>
Subject: minmax: allow comparisons of 'int' against 'unsigned char/short'
Date: Mon, 18 Sep 2023 08:18:40 +0000
Since 'unsigned char/short' get promoted to 'signed int' it is safe to
compare them against an 'int' value.
Link: https://lkml.kernel.org/r/8732ef5f809c47c28a7be47c938b28d4@xxxxxxxxxxxxxxxx
Signed-off-by: David Laight <david.laight@xxxxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Jason A. Donenfeld <Jason@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/minmax.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/include/linux/minmax.h~minmax-allow-comparisons-of-int-against-unsigned-char-short
+++ a/include/linux/minmax.h
@@ -26,8 +26,9 @@
__builtin_choose_expr(__is_constexpr(is_signed_type(typeof(x))), \
is_signed_type(typeof(x)), 0)
-#define __types_ok(x, y) \
- (__is_signed(x) == __is_signed(y))
+#define __types_ok(x, y) \
+ (__is_signed(x) == __is_signed(y) || \
+ __is_signed((x) + 0) == __is_signed((y) + 0))
#define __cmp_op_min <
#define __cmp_op_max >
_
Patches currently in -mm which might be from David.Laight@xxxxxxxxxx are
minmax-add-umina-b-and-umaxa-b.patch
minmax-allow-min-max-clamp-if-the-arguments-have-the-same-signedness.patch
minmax-fix-indentation-of-__cmp_once-and-__clamp_once.patch
minmax-allow-comparisons-of-int-against-unsigned-char-short.patch
minmax-relax-check-to-allow-comparison-between-unsigned-arguments-and-signed-constants.patch
