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SubjectRe: [PATCH v7 3/7] ftrace: Add arm64 support to recordmcount
On Sat, Mar 15, 2014 at 05:40:44AM +0000, AKASHI Takahiro wrote:
> 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.
> Signed-off-by: AKASHI Takahiro <>

Acked-by: Will Deacon <>


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