From a743f26d03a96593c0f3d05dc26b388f45de67c9 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Thu, 22 Feb 2024 22:40:29 -0800 Subject: arm64: ftrace: Don't forbid CALL_OPS+CC_OPTIMIZE_FOR_SIZE with Clang Per commit b3f11af9b2ce ("arm64: ftrace: forbid CALL_OPS with CC_OPTIMIZE_FOR_SIZE"), GCC is silently ignoring `-falign-functions=N` when passed `-Os`, causing functions to be improperly aligned. This doesn't seem to be a problem with Clang though, where enabling CALL_OPS with CC_OPTIMIZE_FOR_SIZE doesn't spit out any warnings at boot about misaligned patch-sites. Only forbid CALL_OPS if GCC is used and we're optimizing for size so that CALL_OPS can be used with clang optimizing for size. Cc: Jason Ling Cc: Florian Fainelli Cc: Mark Rutland Cc: Nathan Chancellor Cc: Nick Desaulniers Cc: Bill Wendling Cc: Justin Stitt Cc: llvm@lists.linux.dev Fixes: b3f11af9b2ce ("arm64: ftrace: forbid CALL_OPS with CC_OPTIMIZE_FOR_SIZE") Signed-off-by: Stephen Boyd Reviewed-by: Nathan Chancellor Link: https://lore.kernel.org/r/20240223064032.3463229-1-swboyd@chromium.org Signed-off-by: Catalin Marinas --- arch/arm64/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 430fabf20f17..b73d702e1e30 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -198,7 +198,7 @@ config ARM64 if DYNAMIC_FTRACE_WITH_ARGS && DYNAMIC_FTRACE_WITH_CALL_OPS select HAVE_DYNAMIC_FTRACE_WITH_CALL_OPS \ if (DYNAMIC_FTRACE_WITH_ARGS && !CFI_CLANG && \ - !CC_OPTIMIZE_FOR_SIZE) + (CC_IS_CLANG || !CC_OPTIMIZE_FOR_SIZE)) select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY \ if DYNAMIC_FTRACE_WITH_ARGS select HAVE_SAMPLE_FTRACE_DIRECT -- cgit v1.2.3