From: David Laight <David.Laight@ACULAB.COM>
To: "'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>,
"'Linus Torvalds'" <torvalds@linux-foundation.org>,
'Netdev' <netdev@vger.kernel.org>,
"'dri-devel@lists.freedesktop.org'"
<dri-devel@lists.freedesktop.org>
Cc: 'Jens Axboe' <axboe@kernel.dk>,
"'Matthew Wilcox (Oracle)'" <willy@infradead.org>,
'Christoph Hellwig' <hch@infradead.org>,
"'linux-btrfs@vger.kernel.org'" <linux-btrfs@vger.kernel.org>,
"'Andrew Morton'" <akpm@linux-foundation.org>,
'Andy Shevchenko' <andriy.shevchenko@linux.intel.com>,
"'David S . Miller'" <davem@davemloft.net>,
'Dan Carpenter' <dan.carpenter@linaro.org>,
"'Jani Nikula'" <jani.nikula@linux.intel.com>
Subject: [PATCH next v2 05/11] minmax: Move the signedness check out of __cmp_once() and __clamp_once()
Date: Sun, 25 Feb 2024 16:51:39 +0000 [thread overview]
Message-ID: <996e4d9df3a845488d740b90934a668c@AcuMS.aculab.com> (raw)
In-Reply-To: <0fff52305e584036a777f440b5f474da@AcuMS.aculab.com>
There is no need to do the signedness/type check when the arguments
are being cast to a fixed type.
So move the check out of __xxx_once() into __careful_xxx().
Signed-off-by: David Laight <david.laight@aculab.com>
---
include/linux/minmax.h | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
Changes for v2:
- Typographical and spelling corrections to the commit messages.
Patches unchanged.
diff --git a/include/linux/minmax.h b/include/linux/minmax.h
index 8ee003d8abaf..111c52a14fe5 100644
--- a/include/linux/minmax.h
+++ b/include/linux/minmax.h
@@ -46,14 +46,14 @@
#define __cmp_once(op, x, y, uniq) ({ \
typeof(x) __x_##uniq = (x); \
typeof(y) __y_##uniq = (y); \
- _Static_assert(__types_ok(x, y), \
- #op "(" #x ", " #y ") signedness error, fix types or consider u" #op "() before " #op "_t()"); \
__cmp(op, __x_##uniq, __y_##uniq); })
#define __careful_cmp(op, x, y, uniq) \
__builtin_choose_expr(__is_constexpr((x) - (y)), \
__cmp(op, x, y), \
- __cmp_once(op, x, y, uniq))
+ ({ _Static_assert(__types_ok(x, y), \
+ #op "(" #x ", " #y ") signedness error, fix types or consider u" #op "() before " #op "_t()"); \
+ __cmp_once(op, x, y, uniq); }))
/**
* min - return minimum of two values of the same or compatible types
@@ -139,14 +139,14 @@
_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"); \
__clamp(__val_##uniq, __lo_##uniq, __hi_##uniq); })
-#define __careful_clamp(val, lo, hi, uniq) ({ \
+#define __careful_clamp(val, lo, hi, uniq) \
__builtin_choose_expr(__is_constexpr((val) - (lo) + (hi)), \
__clamp(val, lo, hi), \
- __clamp_once(val, lo, hi, uniq)); })
+ ({ _Static_assert(__types_ok(val, lo), "clamp() 'lo' signedness error"); \
+ _Static_assert(__types_ok(val, hi), "clamp() 'hi' signedness error"); \
+ __clamp_once(val, lo, hi, uniq); }))
/**
* clamp - return a value clamped to a given range with strict typechecking
--
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:[~2024-02-25 16:51 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-25 16:46 [PATCH next v2 00/11] minmax: Optimise to reduce .i line length David Laight
2024-02-25 16:48 ` [PATCH next v2 01/11] minmax: Put all the clamp() definitions together David Laight
2024-02-25 16:49 ` [PATCH next v2 02/11] minmax: Use _Static_assert() instead of static_assert() David Laight
2024-02-26 9:28 ` Jani Nikula
2024-02-26 10:07 ` David Laight
2024-02-26 10:27 ` Jani Nikula
2024-02-25 16:49 ` [PATCH next v2 03/11] minmax: Simplify signedness check David Laight
2024-02-27 1:34 ` kernel test robot
2024-02-27 9:10 ` David Laight
2024-02-25 16:50 ` [PATCH next v2 04/11] minmax: Replace multiple __UNIQUE_ID() by directly using __COUNTER__ David Laight
2024-02-25 16:51 ` David Laight [this message]
2024-02-25 16:52 ` [PATCH next v2 06/11] minmax: Remove 'constexpr' check from __careful_clamp() David Laight
2024-02-25 16:53 ` [PATCH next v2 07/11] minmax: minmax: Add __types_ok3() and optimise defines with 3 arguments David Laight
2024-02-25 16:53 ` [PATCH next v2 08/11] minmax: Add min_const() and max_const() David Laight
2024-02-25 17:13 ` Linus Torvalds
2024-02-25 21:09 ` David Laight
2024-02-25 21:26 ` David Laight
2024-02-26 1:11 ` Dave Airlie
2024-02-25 16:54 ` [PATCH next v2 09/11] tree-wide: minmax: Replace all the uses of max() for array sizes with max_const() David Laight
2024-02-25 16:56 ` [PATCH next v2 10/11] block: Use a boolean expression instead of max() on booleans David Laight
2024-02-25 16:56 ` [PATCH next v2 11/11] minmax: min() and max() don't need to return constant expressions David Laight
2024-02-26 9:42 ` kernel test robot
2024-02-26 10:16 ` David Laight
2024-02-26 10:56 ` kernel test robot
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