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authorNaveen N Rao <naveen@kernel.org>2023-09-13 16:41:29 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2023-09-18 05:23:47 +0300
commit60d77ed24bb3068c0837fe45b8921b0a6598829d (patch)
treee8b6ec828eb85878a5a19175f5a039b5ba3227c7 /arch/powerpc
parent27646b2e02b096a6936b3e3b6ba334ae20763eab (diff)
downloadlinux-60d77ed24bb3068c0837fe45b8921b0a6598829d.tar.xz
powerpc: Fix build issue with LD_DEAD_CODE_DATA_ELIMINATION and FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
We recently added support for -fpatchable-function-entry and it is enabled by default on ppc32 (ppc64 needs gcc v13.1.0). When building the kernel for ppc32 and also enabling CONFIG_LD_DEAD_CODE_DATA_ELIMINATION, we see the below build error with older gcc versions: powerpc-linux-gnu-ld: init/main.o(__patchable_function_entries): error: need linked-to section for --gc-sections This error is thrown since __patchable_function_entries section would be garbage collected with --gc-sections since it does not reference any other kept sections. This has subsequently been fixed with: https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=b7d072167715829eed0622616f6ae0182900de3e Disable LD_DEAD_CODE_DATA_ELIMINATION for gcc versions before v11.1.0 if using -fpatchable-function-entry to avoid this bug. Fixes: 0f71dcfb4aef ("powerpc/ftrace: Add support for -fpatchable-function-entry") Reported-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Naveen N Rao <naveen@kernel.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20230913134129.2782088-1-naveen@kernel.org
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/Kconfig2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 54b9387c3691..3aaadfd2c8eb 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -255,7 +255,7 @@ config PPC
select HAVE_KPROBES
select HAVE_KPROBES_ON_FTRACE
select HAVE_KRETPROBES
- select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if HAVE_OBJTOOL_MCOUNT
+ select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if HAVE_OBJTOOL_MCOUNT && (!ARCH_USING_PATCHABLE_FUNCTION_ENTRY || (!CC_IS_GCC || GCC_VERSION >= 110100))
select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
select HAVE_MOD_ARCH_SPECIFIC
select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)