summaryrefslogtreecommitdiffstats
path: root/arch/arm64
diff options
context:
space:
mode:
authorAKASHI Takahiro <takahiro.akashi@linaro.org>2014-04-30 10:54:32 +0100
committerWill Deacon <will.deacon@arm.com>2014-05-29 09:04:31 +0100
commitaf64d2aa872a174772ffc00e2558083f70193acb (patch)
tree28f7400e62fa0e764cb12761d103362480dcd6ed /arch/arm64
parent26e2ae39995469b9289aa1ec0144e256d56eb044 (diff)
downloadblackbird-op-linux-af64d2aa872a174772ffc00e2558083f70193acb.tar.gz
blackbird-op-linux-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')
-rw-r--r--arch/arm64/Kconfig2
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
OpenPOWER on IntegriCloud