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authorNaveen N Rao <naveen@kernel.org>2023-05-30 09:14:36 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2023-06-27 09:19:06 +0300
commit25ea739ea1d4d3de41acc4f4eb2d1a97eee0eb75 (patch)
treec132cee36129c7223b6306f890f58c53d92be310 /arch/powerpc
parentd61cd13e732c0eaa7d66b45edb2d0de8eab65a1e (diff)
downloadlinux-25ea739ea1d4d3de41acc4f4eb2d1a97eee0eb75.tar.xz
powerpc: Fail build if using recordmcount with binutils v2.37
binutils v2.37 drops unused section symbols, which prevents recordmcount from capturing mcount locations in sections that have no non-weak symbols. This results in a build failure with a message such as: Cannot find symbol for section 12: .text.perf_callchain_kernel. kernel/events/callchain.o: failed The change to binutils was reverted for v2.38, so this behavior is specific to binutils v2.37: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=c09c8b42021180eee9495bd50d8b35e683d3901b Objtool is able to cope with such sections, so this issue is specific to recordmcount. Fail the build and print a warning if binutils v2.37 is detected and if we are using recordmcount. Cc: stable@vger.kernel.org Suggested-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Naveen N Rao <naveen@kernel.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20230530061436.56925-1-naveen@kernel.org
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/Makefile8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 76fc7cc26780..449514ec1fdf 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -409,3 +409,11 @@ checkbin:
echo -n '*** Please use a different binutils version.' ; \
false ; \
fi
+ @if test "x${CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT}" = "xy" -a \
+ "x${CONFIG_LD_IS_BFD}" = "xy" -a \
+ "${CONFIG_LD_VERSION}" = "23700" ; then \
+ echo -n '*** binutils 2.37 drops unused section symbols, which recordmcount ' ; \
+ echo 'is unable to handle.' ; \
+ echo '*** Please use a different binutils version.' ; \
+ false ; \
+ fi