powerpc/64s: Disable stack variable initialisation for prom_init
With GCC 12 allmodconfig prom_init fails to build: Error: External symbol 'memset' referenced from prom_init.c make[2]: *** [arch/powerpc/kernel/Makefile:204: arch/powerpc/kernel/prom_init_check] Error 1 The allmodconfig build enables KASAN, so all calls to memset in prom_init should be converted to __memset by the #ifdefs in asm/string.h, because prom_init must use the non-KASAN instrumented versions. The build failure happens because there's a call to memset that hasn't been caught by the pre-processor and converted to __memset. Typically that's because it's a memset generated by the compiler itself, and that is the case here. With GCC 12, allmodconfig enables CONFIG_INIT_STACK_ALL_PATTERN, which causes the compiler to emit memset calls to initialise on-stack variables with a pattern. Because prom_init is non-user-facing boot-time only code, as a workaround just disable stack variable initialisation to unbreak the build. Reported-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220718134418.354114-1-mpe@ellerman.id.au
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@ -20,6 +20,7 @@ CFLAGS_prom.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
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CFLAGS_prom_init.o += -fno-stack-protector
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CFLAGS_prom_init.o += -DDISABLE_BRANCH_PROFILING
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CFLAGS_prom_init.o += -ffreestanding
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CFLAGS_prom_init.o += $(call cc-option, -ftrivial-auto-var-init=uninitialized)
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ifdef CONFIG_FUNCTION_TRACER
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# Do not trace early boot code
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