From: David Laight <David.Laight@ACULAB.COM>
To: "'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>,
"'Andy Shevchenko'" <andriy.shevchenko@linux.intel.com>,
'Andrew Morton' <akpm@linux-foundation.org>,
"'Matthew Wilcox (Oracle)'" <willy@infradead.org>,
'Christoph Hellwig' <hch@infradead.org>,
"'Jason A. Donenfeld'" <Jason@zx2c4.com>,
'Linus Torvalds' <torvalds@linux-foundation.org>
Subject: [PATCH v3 4/5] minmax: Allow comparisons of 'int' against 'unsigned char/short'.
Date: Fri, 4 Aug 2023 10:55:39 +0000 [thread overview]
Message-ID: <423c552b375c46ddab16488d33dee528@AcuMS.aculab.com> (raw)
In-Reply-To: <01e3e09005e9434b8f558a893a47c053@AcuMS.aculab.com>
Since 'unsigned char/short' get promoted to 'signed int' it is
safe to compare them against an 'int' value.
Signed-off-by: David Laight <david.laight@aculab.com>
---
v3; No change
v2: No change
include/linux/minmax.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/include/linux/minmax.h b/include/linux/minmax.h
index ccfbe003a643..f56611ab486a 100644
--- a/include/linux/minmax.h
+++ b/include/linux/minmax.h
@@ -24,8 +24,9 @@
__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 >
--
2.17.1
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2023-08-04 10:57 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-04 10:50 [PATCH next v3 0/5] minmax: Relax type checks in min() and max() David Laight
2023-08-04 10:53 ` [PATCH v3 1/5] minmax: Add min_unsigned(a, b) and max_unsigned(a, b) David Laight
2023-08-04 10:54 ` [PATCH v3 2/5] minmax: Allow min()/max()/clamp() if the arguments have the same signedness David Laight
2023-08-04 10:55 ` [PATCH v3 3/5] minmax: Fix indentation of __cmp_once() and __clamp_once() David Laight
2023-08-04 10:55 ` David Laight [this message]
2023-08-04 10:56 ` [PATCH v3 5/5] minmax: Relax check to allow comparison between int and small unsigned constants David Laight
2023-08-04 18:14 ` Linus Torvalds
2023-08-07 10:50 ` David Laight
2023-08-07 15:48 ` Linus Torvalds
2023-08-10 8:29 ` David Laight
2023-08-10 19:46 ` Linus Torvalds
2023-08-14 8:04 ` David Laight
2023-08-14 14:51 ` David Laight
2023-08-14 15:29 ` David Laight
2023-08-14 21:21 ` [PATCH next v3 0/5] minmax: Relax type checks in min() and max() Kees Cook
2023-08-15 8:55 ` David Laight
2023-08-21 18:24 ` Kees Cook
2023-08-22 17:35 ` Linus Torvalds
2023-08-23 8:42 ` David Laight
2023-08-23 8:52 ` David Laight
2023-08-23 15:32 ` Linus Torvalds
2023-08-24 9:05 ` David Laight
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