[PATCH] powerpc/xmon: Exclude all of xmon/ from ftrace

[Michael Ellerman]

Michael Ellerman <mpe at ellerman.id.au> writes:

> "Naveen N. Rao" <naveen.n.rao at linux.vnet.ibm.com> writes:
>
>> diff --git a/arch/powerpc/xmon/Makefile b/arch/powerpc/xmon/Makefile
>> index 0b2f771593eb..5f95af64cb8f 100644
>> --- a/arch/powerpc/xmon/Makefile
>> +++ b/arch/powerpc/xmon/Makefile
>> @@ -7,6 +7,19 @@ UBSAN_SANITIZE := n
>>  
>>  ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
>>  
>> +ifdef CONFIG_FUNCTION_TRACER
>> +CFLAGS_REMOVE_xmon.o	= -mno-sched-epilog $(CC_FLAGS_FTRACE)
>> +CFLAGS_REMOVE_nonstdio.o = -mno-sched-epilog $(CC_FLAGS_FTRACE)
>> +ifdef CONFIG_XMON_DISASSEMBLY
>> +CFLAGS_REMOVE_ppc-dis.o	= -mno-sched-epilog $(CC_FLAGS_FTRACE)
>> +CFLAGS_REMOVE_ppc-opc.o	= -mno-sched-epilog $(CC_FLAGS_FTRACE)
>> +ifdef CONFIG_SPU_BASE
>> +CFLAGS_REMOVE_spu-dis.o	= -mno-sched-epilog $(CC_FLAGS_FTRACE)
>> +CFLAGS_REMOVE_spu-opc.o	= -mno-sched-epilog $(CC_FLAGS_FTRACE)
>> +endif
>> +endif
>> +endif
>
> Urk.
>
> We want to disable it for everything in the directory, so can you do
> something like:
>
>   ORIG_CFLAGS := $(KBUILD_CFLAGS)
>   KBUILD_CFLAGS = $(subst $(CC_FLAGS_FTRACE),,$(ORIG_CFLAGS))

Yes:

  # Disable ftrace for the entire directory
  ORIG_CFLAGS := $(KBUILD_CFLAGS)
  KBUILD_CFLAGS = $(subst -mno-sched-epilog,,$(subst $(CC_FLAGS_FTRACE),,$(ORIG_CFLAGS)))

Seems to work.

cheers