linux-kernel - [PATCH 6/7] minmax: Optimise _Static

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Message-ID: <46f446f61c4f4304b756e38a19782ed9@AcuMS.aculab.com>
Date: Wed, 24 Jul 2024 14:32:22 +0000
From: David Laight <David.Laight@...LAB.COM>
To: "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>, "'Linus
 Torvalds'" <torvalds@...uxfoundation.org>
CC: "'Matthew Wilcox (Oracle)'" <willy@...radead.org>, 'Christoph Hellwig'
	<hch@...radead.org>, 'Andrew Morton' <akpm@...ux-foundation.org>, "'Andy
 Shevchenko'" <andriy.shevchenko@...ux.intel.com>, 'Dan Carpenter'
	<dan.carpenter@...aro.org>, 'Arnd Bergmann' <arnd@...nel.org>,
	"'Jason@...c4.com'" <Jason@...c4.com>, "'hch@...radead.org'"
	<hch@...radead.org>, "'pedro.falcato@...il.com'" <pedro.falcato@...il.com>,
	'Mateusz Guzik' <mjguzik@...il.com>, "'linux-mm@...ck.org'"
	<linux-mm@...ck.org>
Subject: [PATCH 6/7] minmax: Optimise _Static_assert() check in clamp()

Use __if_constexpr() instead of __builtin_choose_expr(__is_constexpr()).

Signed-off-by: David Laight <david.laight@...lab.com>
---
 include/linux/minmax.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/include/linux/minmax.h b/include/linux/minmax.h
index e250957036a1..2fb63efbeb0e 100644
--- a/include/linux/minmax.h
+++ b/include/linux/minmax.h
@@ -139,8 +139,7 @@
 	typeof(val) unique_val = (val);						\
 	typeof(lo) unique_lo = (lo);						\
 	typeof(hi) unique_hi = (hi);						\
-	_Static_assert(__builtin_choose_expr(__is_constexpr((lo) > (hi)),	\
-			(lo) <= (hi), true),					\
+	_Static_assert(__if_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");	\
-- 
2.17.1

-
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