linux-kernel - [PATCH] sparse: can do constant folding of __builtin

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Message-Id: <20210226092236.99369-1-luc.vanoostenryck@gmail.com>
Date:   Fri, 26 Feb 2021 10:22:36 +0100
From:   Luc Van Oostenryck <luc.vanoostenryck@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Subject: [PATCH] sparse: can do constant folding of __builtin_bswap*()

Sparse can do constant folding of __builtin_bswap*() since 2017.
Also, a much recent version of Sparse is needed anyway, see
commit 6ec4476ac825 ("Raise gcc version requirement to 4.9").

So, remove the comment about sparse not being yet able to constant
fold __builtin_bswap*() and remove the corresponding test of __CHECKER__.

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@...il.com>
---
 include/linux/compiler-gcc.h | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 74c6c0486eed..d1016cc6798a 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -95,15 +95,11 @@
  */
 #define asm_volatile_goto(x...)	do { asm goto(x); asm (""); } while (0)
 
-/*
- * sparse (__CHECKER__) pretends to be gcc, but can't do constant
- * folding in __builtin_bswap*() (yet), so don't set these for it.
- */
-#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) && !defined(__CHECKER__)
+#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP)
 #define __HAVE_BUILTIN_BSWAP32__
 #define __HAVE_BUILTIN_BSWAP64__
 #define __HAVE_BUILTIN_BSWAP16__
-#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP && !__CHECKER__ */
+#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
 
 #if GCC_VERSION >= 70000
 #define KASAN_ABI_VERSION 5
-- 
2.30.0