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

From	kbuild test robot <fengguang.wu@intel.com>
Newsgroups	linux.kernel
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
Date	2017-04-03 05:50 +0200
Message-ID	<ts1a9-1tT-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   a71c9a1c779f2499fb2afc0553e543f18aff6edf
commit: 3f135e57a4f76d24ae8d8a490314331f0ced40c5 x86/build: Mostly disable '-maccumulate-outgoing-args'
date:   4 days ago
config: x86_64-randconfig-a0-04031038 (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

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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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 kbuild test robot <fengguang.wu@intel.com> - 2017-04-03 05:50 +0200

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