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authorArd Biesheuvel <ardb@kernel.org>2022-01-25 17:55:24 +0300
committerArd Biesheuvel <ardb@kernel.org>2022-02-09 11:13:59 +0300
commit41918ec82eb6f80c8b401422f27ca76c85aa0cb7 (patch)
tree1bd1010a1e6e5a52d3c4ed22d768f863ce10dc6a /arch/arm/Kconfig.debug
parent538b9265c063f081ca6b1228d242575a1db60711 (diff)
downloadlinux-41918ec82eb6f80c8b401422f27ca76c85aa0cb7.tar.xz
ARM: ftrace: enable the graph tracer with the EABI unwinder
Enable the function graph tracer in combination with the EABI unwinder, so that Thumb2 builds or Clang ARM builds can make use of it. This involves using the unwinder to locate the return address of an instrumented function on the stack, so that it can be overridden and made to refer to the ftrace handling routines that need to be called at function return. Given that for these builds, it is not guaranteed that the value of the link register is stored on the stack, fall back to the stack slot that will be used by the ftrace exit code to restore LR in the instrumented function's execution context. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'arch/arm/Kconfig.debug')
-rw-r--r--arch/arm/Kconfig.debug2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 98436702e0c7..b79dc7fa89bf 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -65,7 +65,7 @@ config UNWINDER_FRAME_POINTER
config UNWINDER_ARM
bool "ARM EABI stack unwinder"
- depends on AEABI && !FUNCTION_GRAPH_TRACER
+ depends on AEABI
# https://github.com/ClangBuiltLinux/linux/issues/732
depends on !LD_IS_LLD || LLD_VERSION >= 110000
select ARM_UNWIND