From: Nathan Chancellor <nathan@kernel.org>
To: Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Albert Ou <aou@eecs.berkeley.edu>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
clang-built-linux@googlegroups.com,
Nathan Chancellor <nathan@kernel.org>,
kernel test robot <lkp@intel.com>
Subject: [PATCH 3/3] riscv: Select HAVE_DYNAMIC_FTRACE when -fpatchable-function-entry is available
Date: Thu, 25 Mar 2021 15:38:07 -0700 [thread overview]
Message-ID: <20210325223807.2423265-4-nathan@kernel.org> (raw)
In-Reply-To: <20210325223807.2423265-1-nathan@kernel.org>
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@intel.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
arch/riscv/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 87d7b52f278f..ba1d07640b66 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -227,7 +227,7 @@ 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
--
2.31.0
next prev parent reply other threads:[~2021-03-25 22:39 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-25 22:38 [PATCH 0/3] Fix CONFIG_FUNCTION_TRACER with clang Nathan Chancellor
2021-03-25 22:38 ` [PATCH 1/3] scripts/recordmcount.pl: Fix RISC-V regex for clang Nathan Chancellor
2021-03-25 23:36 ` Fangrui Song
2021-03-25 22:38 ` [PATCH 2/3] riscv: Workaround mcount name prior to clang-13 Nathan Chancellor
2021-03-29 18:32 ` Nick Desaulniers
2021-03-25 22:38 ` Nathan Chancellor [this message]
2021-03-25 23:38 ` [PATCH 3/3] riscv: Select HAVE_DYNAMIC_FTRACE when -fpatchable-function-entry is available Fangrui Song
2021-03-26 8:37 ` [PATCH 0/3] Fix CONFIG_FUNCTION_TRACER with clang Sedat Dilek
2021-03-26 13:07 ` Nathan Chancellor
2021-03-27 12:16 ` Sedat Dilek
2021-04-11 21:27 ` Palmer Dabbelt
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