linux-kernel - [ammarfaizi2-block:tglx/devel/depthtracking 9/59] arch/x86/include/asm/linkage.h:20:3: error: #error Unsupported function alignment

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Message-ID: <202208070826.3lDtoagS-lkp@intel.com>
Date:   Sun, 7 Aug 2022 08:55:53 +0800
From:   kernel test robot <lkp@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     kbuild-all@...ts.01.org, Ammar Faizi <ammarfaizi2@...weeb.org>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org
Subject: [ammarfaizi2-block:tglx/devel/depthtracking 9/59]
 arch/x86/include/asm/linkage.h:20:3: error: #error Unsupported function
 alignment

tree:   https://github.com/ammarfaizi2/linux-block tglx/devel/depthtracking
head:   b518e558c49324fa002255761d2a7324ba31f7b5
commit: 63ca4d9b1d429d6cc9c1a99c81f73eaf88eadbb3 [9/59] x86/asm: Ensure proper function alignment
config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20220807/202208070826.3lDtoagS-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/ammarfaizi2/linux-block/commit/63ca4d9b1d429d6cc9c1a99c81f73eaf88eadbb3
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block tglx/devel/depthtracking
        git checkout 63ca4d9b1d429d6cc9c1a99c81f73eaf88eadbb3
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um SUBARCH=i386 prepare

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All error/warnings (new ones prefixed by >>):

   arch/x86/um/user-offsets.c:17:6: warning: no previous prototype for 'foo' [-Wmissing-prototypes]
      17 | void foo(void)
         |      ^~~
   In file included from include/linux/linkage.h:8,
                    from include/linux/printk.h:8,
                    from include/asm-generic/bug.h:22,
                    from ./arch/um/include/generated/asm/bug.h:1,
                    from include/linux/bug.h:5,
                    from include/linux/page-flags.h:10,
                    from kernel/bounds.c:10:
   arch/x86/include/asm/linkage.h:15:5: warning: "CONFIG_FUNCTION_ALIGNMENT" is not defined, evaluates to 0 [-Wundef]
      15 | #if CONFIG_FUNCTION_ALIGNMENT == 8
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/linkage.h:17:7: warning: "CONFIG_FUNCTION_ALIGNMENT" is not defined, evaluates to 0 [-Wundef]
      17 | #elif CONFIG_FUNCTION_ALIGNMENT == 16
         |       ^~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/x86/include/asm/linkage.h:20:3: error: #error Unsupported function alignment
      20 | # error Unsupported function alignment
         |   ^~~~~
   In file included from include/linux/printk.h:8,
                    from include/asm-generic/bug.h:22,
                    from ./arch/um/include/generated/asm/bug.h:1,
                    from include/linux/bug.h:5,
                    from include/linux/page-flags.h:10,
                    from kernel/bounds.c:10:
>> include/linux/linkage.h:73: warning: "__ALIGN_STR" redefined
      73 | #define __ALIGN_STR     ".align 4,0x90"
         | 
   In file included from include/linux/linkage.h:8,
                    from include/linux/printk.h:8,
                    from include/asm-generic/bug.h:22,
                    from ./arch/um/include/generated/asm/bug.h:1,
                    from include/linux/bug.h:5,
                    from include/linux/page-flags.h:10,
                    from kernel/bounds.c:10:
   arch/x86/include/asm/linkage.h:23: note: this is the location of the previous definition
      23 | #define __ALIGN_STR             __stringify(__ALIGN)
         | 
   make[2]: *** [scripts/Makefile.build:117: kernel/bounds.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [Makefile:1200: prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:219: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +20 arch/x86/include/asm/linkage.h

    14	
    15	#if CONFIG_FUNCTION_ALIGNMENT == 8
    16	#define __ALIGN			.p2align 3, 0x90;
    17	#elif CONFIG_FUNCTION_ALIGNMENT == 16
    18	#define __ALIGN			.p2align 4, 0x90;
    19	#else
  > 20	# error Unsupported function alignment
    21	#endif
    22	

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