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 <jasonling@chromium.org>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Bill Wendling <morbo@google.com>
Cc: Justin Stitt <justinstitt@google.com>
Cc: llvm@lists.linux.dev
Fixes: b3f11af9b2ce ("arm64: ftrace: forbid CALL_OPS with CC_OPTIMIZE_FOR_SIZE")
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20240223064032.3463229-1-swboyd@chromium.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 430fabf20f17349ccb9c31a7e9a4ac7b3fd6009d..b73d702e1e3010cdcf8d49b99b4390f7ea16e3f1 100644 (file)
--- 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