From: David Laight <David.Laight@ACULAB.COM>
To: "'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>
Cc: 'Linus Torvalds' <torvalds@linuxfoundation.org>,
'Jens Axboe' <axboe@kernel.dk>,
"'Matthew Wilcox (Oracle)'" <willy@infradead.org>,
'Christoph Hellwig' <hch@infradead.org>,
'Andrew Morton' <akpm@linux-foundation.org>,
'Andy Shevchenko' <andriy.shevchenko@linux.intel.com>,
'Dan Carpenter' <dan.carpenter@linaro.org>,
'Arnd Bergmann' <arnd@kernel.org>,
"'Jason@zx2c4.com'" <Jason@zx2c4.com>,
"'pedro.falcato@gmail.com'" <pedro.falcato@gmail.com>,
'Mateusz Guzik' <mjguzik@gmail.com>,
"'linux-mm@kvack.org'" <linux-mm@kvack.org>,
'Lorenzo Stoakes' <lorenzo.stoakes@oracle.com>
Subject: [PATCH v2 2/8] minmax: Use _Static_assert() instead of static_assert()
Date: Sun, 28 Jul 2024 14:18:47 +0000 [thread overview]
Message-ID: <b169a04caaee43c7b917a7e48470da6a@AcuMS.aculab.com> (raw)
In-Reply-To: <402c3c617c29465c898b1af55e3c6095@AcuMS.aculab.com>
The static_assert() wrapper provides the text of the expression as the
error message, this isn't needed here as an explicit message is provided.
If there is an error (quite likely for min/max) the wrapper also adds
two more lines of error output that just make it harder to read.
Since it gives no benefit and actually makes things worse directly
using _Static_assert() is much better.
Signed-off-by: David Laight <david.laight@aculab.com>
---
v2:
- No change.
include/linux/minmax.h | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/include/linux/minmax.h b/include/linux/minmax.h
index cea63a8ac80f..ab64b2e73ae5 100644
--- a/include/linux/minmax.h
+++ b/include/linux/minmax.h
@@ -48,7 +48,7 @@
#define __cmp_once(op, x, y, unique_x, unique_y) ({ \
typeof(x) unique_x = (x); \
typeof(y) unique_y = (y); \
- static_assert(__types_ok(x, y), \
+ _Static_assert(__types_ok(x, y), \
#op "(" #x ", " #y ") signedness error, fix types or consider u" #op "() before " #op "_t()"); \
__cmp(op, unique_x, unique_y); })
@@ -137,11 +137,11 @@
typeof(val) unique_val = (val); \
typeof(lo) unique_lo = (lo); \
typeof(hi) unique_hi = (hi); \
- static_assert(__builtin_choose_expr(__is_constexpr((lo) > (hi)), \
+ _Static_assert(__builtin_choose_expr(__is_constexpr((lo) > (hi)), \
(lo) <= (hi), true), \
"clamp() low limit " #lo " greater than high limit " #hi); \
- static_assert(__types_ok(val, lo), "clamp() 'lo' signedness error"); \
- static_assert(__types_ok(val, hi), "clamp() 'hi' signedness error"); \
+ _Static_assert(__types_ok(val, lo), "clamp() 'lo' signedness error"); \
+ _Static_assert(__types_ok(val, hi), "clamp() 'hi' signedness error"); \
__clamp(unique_val, unique_lo, unique_hi); })
#define __careful_clamp(val, lo, hi) ({ \
--
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:[~2024-07-28 14:19 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-28 14:15 [PATCH v2 0/8] minmax: reduce compilation time David Laight
2024-07-28 14:17 ` [PATCH v2 1/8] minmax: Put all the clamp() definitions together David Laight
2024-07-28 17:24 ` Linus Torvalds
2024-07-28 18:11 ` David Laight
2024-07-28 19:55 ` Linus Torvalds
2024-07-28 20:09 ` David Laight
2024-07-28 20:13 ` Linus Torvalds
2024-07-28 20:22 ` David Laight
2024-07-28 20:31 ` Linus Torvalds
2024-07-28 22:13 ` David Laight
2024-07-28 22:22 ` Linus Torvalds
2024-07-29 8:01 ` David Laight
2024-07-28 21:01 ` Linus Torvalds
2024-07-28 21:53 ` David Laight
2024-07-29 4:15 ` Linus Torvalds
2024-07-29 22:25 ` Arnd Bergmann
2024-07-29 23:21 ` Linus Torvalds
2024-07-30 1:52 ` Linus Torvalds
2024-07-30 3:59 ` Linus Torvalds
2024-07-30 10:10 ` Arnd Bergmann
2024-07-30 14:14 ` Arnd Bergmann
2024-07-30 18:02 ` Linus Torvalds
2024-07-30 19:52 ` Linus Torvalds
2024-07-30 21:47 ` David Laight
2024-07-30 22:44 ` Linus Torvalds
2024-07-30 23:03 ` Linus Torvalds
2024-07-31 8:09 ` David Laight
2024-07-31 10:50 ` Arnd Bergmann
2024-07-31 15:38 ` Linus Torvalds
2024-07-31 15:56 ` David Laight
2024-07-31 16:04 ` Linus Torvalds
2024-12-04 13:15 ` Geert Uytterhoeven
2024-12-04 17:16 ` David Laight
2024-07-30 16:35 ` Linus Torvalds
2024-07-30 16:46 ` Linus Torvalds
2024-07-30 12:03 ` David Laight
2024-07-28 18:23 ` David Laight
2024-07-28 14:18 ` David Laight [this message]
2024-07-28 17:51 ` [PATCH v2 2/8] minmax: Use _Static_assert() instead of static_assert() Christophe JAILLET
2024-07-28 18:12 ` David Laight
2024-07-28 14:19 ` [PATCH v2 3/8] compiler.h: Add __if_constexpr(expr, if_const, if_not_const) David Laight
2024-07-28 14:20 ` [PATCH v2 4/8] minmax: Simplify signedness check David Laight
2024-07-28 16:57 ` Linus Torvalds
2024-07-28 18:14 ` David Laight
2024-07-28 20:13 ` David Laight
2024-07-28 14:21 ` [PATCH v2 5/8] minmax: Factor out the zero-extension logic from umin/umax David Laight
2024-07-28 14:22 ` [PATCH v2 6/8] minmax: Optimise _Static_assert() check in clamp() David Laight
2024-07-28 14:23 ` [PATCH v2 7/8] minmax: Use __auto_type David Laight
2024-07-28 16:59 ` Linus Torvalds
2024-07-28 14:24 ` [PATCH v2 8/8] minmax: minmax: Add __types_ok3() and optimise defines with 3 arguments David Laight
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