[PATCH] arc: Fix __fls() const-foldability via __builtin_clzl()

[Kees Cook]

While tracking down a problem where constant expressions used by
BUILD_BUG_ON() suddenly stopped working[1], we found that an added static
initializer was convincing the compiler that it couldn't track the state
of the prior statically initialized value. Tracing this down found that
ffs() was used in the initializer macro, but since it wasn't marked with
__attribute__const__, the compiler had to assume the function might
change variable states as a side-effect (which is not true for ffs(),
which provides deterministic math results).

For arc architecture with CONFIG_ISA_ARCV2=y, the __fls() function
uses __builtin_arc_fls() which lacks GCC's const attribute, preventing
compile-time constant folding[2]. Fix this by handling compile-time
constants with the standard __builtin_clzl() builtin (which has const
attribute) while preserving the optimized arc-specific builtin for runtime
cases. This has the added benefit of skipping runtime calculation of
compile-time constant values.

Build tested ARCH=arc allyesconfig with GCC arc-linux 15.2.0.

Link: https://github.com/KSPP/linux/issues/364 [1]
Link: https://lore.kernel.org/all/202508031025.doWxtzzc-lkp@intel.com/
Reported-by: kernel test robot <lkp at intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202508031025.doWxtzzc-lkp@intel.com/
Signed-off-by: Kees Cook <kees at kernel.org>
---
Cc: Yury Norov <yury.norov at gmail.com>
Cc: Rasmus Villemoes <linux at rasmusvillemoes.dk>
Cc: Vineet Gupta <vgupta at kernel.org>
Cc: <linux-snps-arc at lists.infradead.org>
---
 arch/arc/include/asm/bitops.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arc/include/asm/bitops.h b/arch/arc/include/asm/bitops.h
index 5340c2871392..df894235fdbc 100644
--- a/arch/arc/include/asm/bitops.h
+++ b/arch/arc/include/asm/bitops.h
@@ -133,6 +133,8 @@ static inline __attribute__ ((const)) int fls(unsigned int x)
  */
 static inline __attribute__ ((const)) unsigned long __fls(unsigned long x)
 {
+	if (__builtin_constant_p(x))
+		return x ? BITS_PER_LONG - 1 - __builtin_clzl(x) : 0;
 	/* FLS insn has exactly same semantics as the API */
 	return	__builtin_arc_fls(x);
 }
-- 
2.34.1