This is a note to let you know that I've just added the patch titled
riscv: Select HAVE_DYNAMIC_FTRACE when -fpatchable-function-entry is available
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
riscv-select-have_dynamic_ftrace-when-fpatchable-function-entry-is-available.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From adebc8817b5c975d598ac379bbdf67a7a5186ade Mon Sep 17 00:00:00 2001
From: Nathan Chancellor <nathan@xxxxxxxxxx>
Date: Thu, 25 Mar 2021 15:38:07 -0700
Subject: riscv: Select HAVE_DYNAMIC_FTRACE when -fpatchable-function-entry is available
From: Nathan Chancellor <nathan@xxxxxxxxxx>
commit adebc8817b5c975d598ac379bbdf67a7a5186ade upstream.
clang prior to 13.0.0 does not support -fpatchable-function-entry for
RISC-V.
clang: error: unsupported option '-fpatchable-function-entry=8' for target 'riscv64-unknown-linux-gnu'
To avoid this error, only select HAVE_DYNAMIC_FTRACE when this option is
not available.
Fixes: afc76b8b8011 ("riscv: Using PATCHABLE_FUNCTION_ENTRY instead of MCOUNT")
Link: https://github.com/ClangBuiltLinux/linux/issues/1268
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Reviewed-by: Fangrui Song <maskray@xxxxxxxxxx>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/riscv/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -224,7 +224,7 @@ config ARCH_RV64I
bool "RV64I"
select 64BIT
select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000
- select HAVE_DYNAMIC_FTRACE if MMU
+ select HAVE_DYNAMIC_FTRACE if MMU && $(cc-option,-fpatchable-function-entry=8)
select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_FUNCTION_GRAPH_TRACER
Patches currently in stable-queue which might be from nathan@xxxxxxxxxx are
queue-5.10/riscv-select-have_dynamic_ftrace-when-fpatchable-function-entry-is-available.patch
queue-5.10/s390-define-runtime_discard_exit-to-fix-link-error-with-gnu-ld-2.36.patch
queue-5.10/macintosh-windfarm-use-unsigned-type-for-1-bit-bitfi.patch
queue-5.10/sh-define-runtime_discard_exit.patch
