[PATCH 1/3] powerpc: Drop clang workaround for builtin constant checks

[Michael Ellerman]

The CPU/MMU feature code has build-time checks that the feature value is
a builtin constant.

Back when the code was added clang wasn't able to compile the
checks, so an ifdef was added to avoid the checks for clang builds.
See b5fa0f7f88ed ("powerpc: Fix build failure with clang due to
BUILD_BUG_ON()")

These days clang 13 and later are able to build the checks successfully,
so drop the workaround.

Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
---
 arch/powerpc/include/asm/cpu_has_feature.h | 2 --
 arch/powerpc/include/asm/mmu.h             | 2 --
 2 files changed, 4 deletions(-)

diff --git a/arch/powerpc/include/asm/cpu_has_feature.h b/arch/powerpc/include/asm/cpu_has_feature.h
index 0efabccd820c..92e24e979954 100644
--- a/arch/powerpc/include/asm/cpu_has_feature.h
+++ b/arch/powerpc/include/asm/cpu_has_feature.h
@@ -24,9 +24,7 @@ static __always_inline bool cpu_has_feature(unsigned long feature)
 {
 	int i;
 
-#ifndef __clang__ /* clang can't cope with this */
 	BUILD_BUG_ON(!__builtin_constant_p(feature));
-#endif
 
 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG
 	if (!static_key_feature_checks_initialized) {
diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
index 24f830cf9bb4..4ab9a630d943 100644
--- a/arch/powerpc/include/asm/mmu.h
+++ b/arch/powerpc/include/asm/mmu.h
@@ -246,9 +246,7 @@ static __always_inline bool mmu_has_feature(unsigned long feature)
 {
 	int i;
 
-#ifndef __clang__ /* clang can't cope with this */
 	BUILD_BUG_ON(!__builtin_constant_p(feature));
-#endif
 
 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG
 	if (!static_key_feature_checks_initialized) {
-- 
2.45.0