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arm64: ftrace: allow DIRECT_CALLS without CALL_OPS

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Drop the CALL_OPS requirement from the HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
select. Configurations that keep CALL_OPS (!CFI clang builds, and GCC builds
without CC_OPTIMIZE_FOR_SIZE) are unchanged. CALL_OPS-less configurations
take the ftrace_caller ops-dispatch path for out-of-range direct calls,
trading the per-callsite fast path for working BPF trampolines; in-range
attachments still branch directly with no overhead. GCC -Os builds also gain
DIRECT_CALLS as a side effect.  That is intended: s390 and loongarch already
ship DIRECT_CALLS without any per-callsite fast path.

Assisted-by: Claude:unspecified
Signed-off-by: Jose Fernandez (Anthropic) <jose.fernandez@linux.dev>
Acked-by: Xu Kuohai <xukuohai@huawei.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Clayton Craft <craftyguy@postmarketos.org>
Reviewed-by: Puranjay Mohan <puranjay@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Jose Fernandez (Anthropic) 2026-06-09 05:19:27 +00:00 committed by Will Deacon
parent 123b4fc0f8
commit 9315e22b0c
1 changed files with 1 additions and 1 deletions
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arch/arm64/Kconfig
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@ -187,7 +187,7 @@ config ARM64
if (GCC_SUPPORTS_DYNAMIC_FTRACE_WITH_ARGS || \
CLANG_SUPPORTS_DYNAMIC_FTRACE_WITH_ARGS)
select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS \
if DYNAMIC_FTRACE_WITH_ARGS && DYNAMIC_FTRACE_WITH_CALL_OPS
if DYNAMIC_FTRACE_WITH_ARGS
select HAVE_DYNAMIC_FTRACE_WITH_CALL_OPS \
if (DYNAMIC_FTRACE_WITH_ARGS && !CFI && \
(CC_IS_CLANG || !CC_OPTIMIZE_FOR_SIZE))