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author | AKASHI Takahiro <takahiro.akashi@linaro.org> | 2014-04-30 10:54:32 +0100 |
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committer | Will Deacon <will.deacon@arm.com> | 2014-05-29 09:04:31 +0100 |
commit | af64d2aa872a174772ffc00e2558083f70193acb (patch) | |
tree | 28f7400e62fa0e764cb12761d103362480dcd6ed /arch/arm64/Kconfig | |
parent | 26e2ae39995469b9289aa1ec0144e256d56eb044 (diff) | |
download | lwn-af64d2aa872a174772ffc00e2558083f70193acb.tar.gz lwn-af64d2aa872a174772ffc00e2558083f70193acb.zip |
ftrace: Add arm64 support to recordmcount
Recordmcount utility under scripts is run, after compiling each object,
to find out all the locations of calling _mcount() and put them into
specific seciton named __mcount_loc.
Then linker collects all such information into a table in the kernel image
(between __start_mcount_loc and __stop_mcount_loc) for later use by ftrace.
This patch adds arm64 specific definitions to identify such locations.
There are two types of implementation, C and Perl. On arm64, only C version
is used to build the kernel now that CONFIG_HAVE_C_RECORDMCOUNT is on.
But Perl version is also maintained.
This patch also contains a workaround just in case where a header file,
elf.h, on host machine doesn't have definitions of EM_AARCH64 nor
R_AARCH64_ABS64. Without them, compiling C version of recordmcount will
fail.
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/Kconfig')
-rw-r--r-- | arch/arm64/Kconfig | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 78b356d079dd..c7022a9d5eeb 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -30,12 +30,14 @@ config ARM64 select HAVE_ARCH_JUMP_LABEL select HAVE_ARCH_KGDB select HAVE_ARCH_TRACEHOOK + select HAVE_C_RECORDMCOUNT select HAVE_DEBUG_BUGVERBOSE select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_API_DEBUG select HAVE_DMA_ATTRS select HAVE_DMA_CONTIGUOUS select HAVE_EFFICIENT_UNALIGNED_ACCESS + select HAVE_FTRACE_MCOUNT_RECORD select HAVE_GENERIC_DMA_COHERENT select HAVE_HW_BREAKPOINT if PERF_EVENTS select HAVE_MEMBLOCK |