linux-kernel - arch/x86/kernel/ftrace.c:35:3: error: #error The following combination is not supported: ((compiler missing -mfentry) || (CONFIG_X86_32 and !CONFIG_DYNAMIC_FTRACE)) && CONFIG_FUNCTION_GRAPH_TRACER && CONFIG_CC_OPTIMIZE_FOR

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Message-ID: <201704231017.2Vu6ez1q%fengguang.wu@intel.com>
Date:   Sun, 23 Apr 2017 10:34:18 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>
Subject: arch/x86/kernel/ftrace.c:35:3: error: #error The following
 combination is not supported: ((compiler missing -mfentry) || (CONFIG_X86_32
 and !CONFIG_DYNAMIC_FTRACE)) && CONFIG_FUNCTION_GRAPH_TRACER &&
 CONFIG_CC_OPTIMIZE_FOR_SIZE

Hi Josh,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   94836ecf1e7378b64d37624fbb81fe48fbd4c772
commit: 3f135e57a4f76d24ae8d8a490314331f0ced40c5 x86/build: Mostly disable '-maccumulate-outgoing-args'
date:   3 weeks ago
config: x86_64-randconfig-b0-04231013 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        git checkout 3f135e57a4f76d24ae8d8a490314331f0ced40c5
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

>> arch/x86/kernel/ftrace.c:35:3: error: #error The following combination is not supported: ((compiler missing -mfentry) || (CONFIG_X86_32 and !CONFIG_DYNAMIC_FTRACE)) && CONFIG_FUNCTION_GRAPH_TRACER && CONFIG_CC_OPTIMIZE_FOR_SIZE

vim +35 arch/x86/kernel/ftrace.c

    29	#include <asm/ftrace.h>
    30	#include <asm/nops.h>
    31	
    32	#if defined(CONFIG_FUNCTION_GRAPH_TRACER) && \
    33		!defined(CC_USING_FENTRY) && \
    34		!defined(CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE)
  > 35	# error The following combination is not supported: ((compiler missing -mfentry) || (CONFIG_X86_32 and !CONFIG_DYNAMIC_FTRACE)) && CONFIG_FUNCTION_GRAPH_TRACER && CONFIG_CC_OPTIMIZE_FOR_SIZE
    36	#endif
    37	
    38	#ifdef CONFIG_DYNAMIC_FTRACE

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