minmax: allow comparisons of 'int' against 'unsigned char/short'

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From: David Laight <David.Laight@xxxxxxxxxx>

commit 4ead534fba42fc4fd41163297528d2aa731cd121 upstream.

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>
(cherry picked from commit 4ead534fba42fc4fd41163297528d2aa731cd121)
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 include/linux/minmax.h |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/include/linux/minmax.h
+++ b/include/linux/minmax.h
@@ -25,8 +25,9 @@
 	__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 stable-queue which might be from kroah.com@xxxxxxxxxxxxxxx are

queue-6.1/minmax-allow-min-max-clamp-if-the-arguments-have-the-same-signedness.patch
queue-6.1/minmax-sanity-check-constant-bounds-when-clamping.patch
queue-6.1/minmax-clamp-more-efficiently-by-avoiding-extra-comparison.patch
queue-6.1/minmax-relax-check-to-allow-comparison-between-unsigned-arguments-and-signed-constants.patch
queue-6.1/minmax-fix-header-inclusions.patch
queue-6.1/mm-damon-core-merge-regions-aggressively-when-max_nr_regions-is-unmet.patch
queue-6.1/minmax-allow-comparisons-of-int-against-unsigned-char-short.patch




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