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

Sat, 15 Apr 2017 18:21:23 -0700 

Hi Josh,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   d5ff0814fda50f0306e102f39640cf5bb76af08e
commit: 3f135e57a4f76d24ae8d8a490314331f0ced40c5 x86/build: Mostly disable 
'-maccumulate-outgoing-args'
date:   2 weeks ago
config: x86_64-randconfig-s1-04160822 (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
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