[012/178] include/linux/compiler-gcc.h: sparse can do constant folding of __builtin_bswap*()

Commit Message

Andrew Morton April 30, 2021, 5:53 a.m. UTC

From: Luc Van Oostenryck <[e-mail]>
Subject: include/linux/compiler-gcc.h: 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__.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Luc Van Oostenryck <[e-mail]>
Acked-by: Arnd Bergmann <[e-mail]>
Acked-by: Miguel Ojeda <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 include/linux/compiler-gcc.h |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

Patch

--- a/include/linux/compiler-gcc.h~sparse-can-do-constant-folding-of-__builtin_bswap
+++ a/include/linux/compiler-gcc.h
@@ -90,15 +90,11 @@ 
  */
 #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