The patch titled
Subject: include/linux/compiler-gcc.h: sparse can do constant folding of __builtin_bswap*()
has been added to the -mm tree. Its filename is
sparse-can-do-constant-folding-of-__builtin_bswap.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/sparse-can-do-constant-folding-of-__builtin_bswap.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/sparse-can-do-constant-folding-of-__builtin_bswap.patch
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------------------------------------------------------
From: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
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/20210226092236.99369-1-luc.vanoostenryck@xxxxxxxxx
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Acked-by: Miguel Ojeda <ojeda@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/compiler-gcc.h | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
--- 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
_
Patches currently in -mm which might be from luc.vanoostenryck@xxxxxxxxx are
sparse-can-do-constant-folding-of-__builtin_bswap.patch
