[PATCH] powerpc: Fix build issue with LD_DEAD_CODE_DATA_ELIMINATION and FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY

[Michael Ellerman]

On Wed, 13 Sep 2023 19:11:29 +0530, Naveen N Rao wrote:
> 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
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc: Fix build issue with LD_DEAD_CODE_DATA_ELIMINATION and FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
      https://git.kernel.org/powerpc/c/60d77ed24bb3068c0837fe45b8921b0a6598829d

cheers