[hch-misc:set_fs-removal 14/21] include/linux/uaccess.h:32:3: error: conflicting types for 'mm_segment_t'

Sunday, 9 August 2020

tree:   git://git.infradead.org/users/hch/misc.git set_fs-removal
head:   c303c53544a4cea226bd0eca686edc71b65d701e
commit: d9916e81adce4a67f4c5fd01bbcc0ab1ff3b19c9 [14/21] uaccess: add infrastructure for
kernel builds with set_fs()
config: microblaze-randconfig-m031-20200808 (attached as .config)
compiler: microblaze-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout d9916e81adce4a67f4c5fd01bbcc0ab1ff3b19c9
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=microblaze 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com&gt;

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

   arch/Kconfig:27:warning: ignoring unsupported character '�'
   arch/Kconfig:27:warning: ignoring unsupported character '�'
   scripts/Makefile.asm-generic:25: redundant generic-y found in
arch/microblaze/include/asm/Kbuild: hw_irq.h
   In file included from include/linux/sched/task.h:11,
                    from include/linux/sched/signal.h:9,
                    from include/linux/rcuwait.h:6,
                    from include/linux/percpu-rwsem.h:7,
                    from include/linux/fs.h:33,
                    from include/linux/huge_mm.h:8,
                    from include/linux/mm.h:675,
                    from arch/microblaze/include/asm/io.h:14,
                    from include/linux/io.h:13,
                    from include/linux/irq.h:20,
                    from include/asm-generic/hardirq.h:13,
                    from ./arch/microblaze/include/generated/asm/hardirq.h:1,
                    from include/linux/hardirq.h:10,
                    from include/linux/interrupt.h:11,
                    from include/linux/kernel_stat.h:9,
                    from arch/microblaze/kernel/asm-offsets.c:14:
...
> include/linux/uaccess.h:11:20: warning: extra tokens at end of
#ifdef directive       11 | #ifdef CONFIG_SET_FЅ
         |                    ^
...
> include/linux/uaccess.h:32:3: error: conflicting types for
'mm_segment_t'       32 | } mm_segment_t;
         |   ^~~~~~~~~~~~
   In file included from include/linux/thread_info.h:38,
                    from include/asm-generic/preempt.h:5,
                    from ./arch/microblaze/include/generated/asm/preempt.h:1,
                    from include/linux/preempt.h:78,
                    from include/linux/rcupdate.h:27,
                    from include/linux/rculist.h:11,
                    from include/linux/pid.h:5,
                    from include/linux/sched.h:14,
                    from arch/microblaze/kernel/asm-offsets.c:13:
   arch/microblaze/include/asm/thread_info.h:61:3: note: previous declaration of
'mm_segment_t' was here
      61 | } mm_segment_t;
         |   ^~~~~~~~~~~~
   In file included from include/linux/sched/task.h:11,
                    from include/linux/sched/signal.h:9,
                    from include/linux/rcuwait.h:6,
                    from include/linux/percpu-rwsem.h:7,
                    from include/linux/fs.h:33,
                    from include/linux/huge_mm.h:8,
                    from include/linux/mm.h:675,
                    from arch/microblaze/include/asm/io.h:14,
                    from include/linux/io.h:13,
                    from include/linux/irq.h:20,
                    from include/asm-generic/hardirq.h:13,
                    from ./arch/microblaze/include/generated/asm/hardirq.h:1,
                    from include/linux/hardirq.h:10,
                    from include/linux/interrupt.h:11,
                    from include/linux/kernel_stat.h:9,
                    from arch/microblaze/kernel/asm-offsets.c:14:
...
> include/linux/uaccess.h:34: warning: "uaccess_kernel"
redefined       34 | #define uaccess_kernel()  (false)
         | 
   In file included from include/linux/uaccess.h:9,
                    from include/linux/sched/task.h:11,
                    from include/linux/sched/signal.h:9,
                    from include/linux/rcuwait.h:6,
                    from include/linux/percpu-rwsem.h:7,
                    from include/linux/fs.h:33,
                    from include/linux/huge_mm.h:8,
                    from include/linux/mm.h:675,
                    from arch/microblaze/include/asm/io.h:14,
                    from include/linux/io.h:13,
                    from include/linux/irq.h:20,
                    from include/asm-generic/hardirq.h:13,
                    from ./arch/microblaze/include/generated/asm/hardirq.h:1,
                    from include/linux/hardirq.h:10,
                    from include/linux/interrupt.h:11,
                    from include/linux/kernel_stat.h:9,
                    from arch/microblaze/kernel/asm-offsets.c:14:
   arch/microblaze/include/asm/uaccess.h:44: note: this is the location of the previous
definition
      44 | # define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
         | 
   make[2]: *** [scripts/Makefile.build:114: arch/microblaze/kernel/asm-offsets.s] Error
1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [Makefile:1195: prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:185: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.

vim +/mm_segment_t +32 include/linux/uaccess.h

    10	
...
 11	#ifdef CONFIG_SET_FЅ     12	/*
    13	 * Force the uaccess routines to be wired up for actual userspace access,
    14	 * overriding any possible set_fs(KERNEL_DS) still lingering around.  Undone
    15	 * using force_uaccess_end below.
    16	 */
    17	static inline mm_segment_t force_uaccess_begin(void)
    18	{
    19		mm_segment_t fs = get_fs();
    20	
    21		set_fs(USER_DS);
    22		return fs;
    23	}
    24	
    25	static inline void force_uaccess_end(mm_segment_t oldfs)
    26	{
    27		set_fs(oldfs);
    28	}
    29	#else /* CONFIG_SET_FЅ */
    30	typedef struct {
    31		/* empty dummy */
...
 32	} mm_segment_t;     33	
...
 34	#define uaccess_kernel()		(false)     35	#define
user_addr_max()			(TASK_SIZE_MAX)
    36	

---
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https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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