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Date:	Wed, 7 Oct 2015 06:18:25 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	kbuild-all@...org, tytso@....edu, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/3] random: Make input to output pool balancing per cpu

Hi Andi,

[auto build test ERROR on v4.3-rc4 -- if it's inappropriate base, please ignore]

config: i386-randconfig-x009-201540 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from include/asm-generic/percpu.h:6:0,
                    from arch/x86/include/asm/percpu.h:551,
                    from arch/x86/include/asm/preempt.h:5,
                    from include/linux/preempt.h:64,
                    from include/linux/spinlock.h:50,
                    from include/linux/seqlock.h:35,
                    from include/linux/time.h:5,
                    from include/uapi/linux/timex.h:56,
                    from include/linux/timex.h:56,
                    from include/linux/sched.h:19,
                    from include/linux/utsname.h:5,
                    from drivers/char/random.c:249:
   drivers/char/random.c: In function 'credit_entropy_bits':
>> include/linux/percpu-defs.h:91:33: error: section attribute cannot be specified for local variables
     extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name;  \
                                    ^
   include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION'
     DEFINE_PER_CPU_SECTION(type, name, "")
     ^
   drivers/char/random.c:777:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(struct entropy_store *, lastp) =
              ^
   include/linux/percpu-defs.h:92:26: error: section attribute cannot be specified for local variables
     __PCPU_DUMMY_ATTRS char __pcpu_unique_##name;   \
                             ^
   include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION'
     DEFINE_PER_CPU_SECTION(type, name, "")
     ^
   drivers/char/random.c:777:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(struct entropy_store *, lastp) =
              ^
>> include/linux/percpu-defs.h:92:26: error: declaration of '__pcpu_unique_lastp' with no linkage follows extern declaration
     __PCPU_DUMMY_ATTRS char __pcpu_unique_##name;   \
                             ^
   include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION'
     DEFINE_PER_CPU_SECTION(type, name, "")
     ^
   drivers/char/random.c:777:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(struct entropy_store *, lastp) =
              ^
   include/linux/percpu-defs.h:91:33: note: previous declaration of '__pcpu_unique_lastp' was here
     extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name;  \
                                    ^
   include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION'
     DEFINE_PER_CPU_SECTION(type, name, "")
     ^
   drivers/char/random.c:777:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(struct entropy_store *, lastp) =
              ^
>> drivers/char/random.c:777:50: error: section attribute cannot be specified for local variables
       static DEFINE_PER_CPU(struct entropy_store *, lastp) =
                                                     ^
   include/linux/percpu-defs.h:93:44: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
     extern __PCPU_ATTRS(sec) __typeof__(type) name;   \
                                               ^
   drivers/char/random.c:777:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(struct entropy_store *, lastp) =
              ^
>> drivers/char/random.c:777:50: error: section attribute cannot be specified for local variables
       static DEFINE_PER_CPU(struct entropy_store *, lastp) =
                                                     ^
   include/linux/percpu-defs.h:95:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
     __typeof__(type) name
                      ^
   drivers/char/random.c:777:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(struct entropy_store *, lastp) =
              ^
>> drivers/char/random.c:777:50: error: weak declaration of 'lastp' must be public
       static DEFINE_PER_CPU(struct entropy_store *, lastp) =
                                                     ^
   include/linux/percpu-defs.h:95:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
     __typeof__(type) name
                      ^
   drivers/char/random.c:777:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(struct entropy_store *, lastp) =
              ^
>> drivers/char/random.c:777:50: error: declaration of 'lastp' with no linkage follows extern declaration
       static DEFINE_PER_CPU(struct entropy_store *, lastp) =
                                                     ^
   include/linux/percpu-defs.h:95:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
     __typeof__(type) name
                      ^
   drivers/char/random.c:777:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(struct entropy_store *, lastp) =
              ^
   drivers/char/random.c:777:50: note: previous declaration of 'lastp' was here
       static DEFINE_PER_CPU(struct entropy_store *, lastp) =
                                                     ^
   include/linux/percpu-defs.h:93:44: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
     extern __PCPU_ATTRS(sec) __typeof__(type) name;   \
                                               ^
   drivers/char/random.c:777:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(struct entropy_store *, lastp) =
              ^
>> include/linux/percpu-defs.h:91:33: error: section attribute cannot be specified for local variables
     extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name;  \
                                    ^
   include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION'
     DEFINE_PER_CPU_SECTION(type, name, "")
     ^
   drivers/char/random.c:779:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(int, next_pool);
              ^
   include/linux/percpu-defs.h:92:26: error: section attribute cannot be specified for local variables
     __PCPU_DUMMY_ATTRS char __pcpu_unique_##name;   \
                             ^
   include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION'
     DEFINE_PER_CPU_SECTION(type, name, "")
     ^
   drivers/char/random.c:779:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(int, next_pool);
              ^
>> include/linux/percpu-defs.h:92:26: error: declaration of '__pcpu_unique_next_pool' with no linkage follows extern declaration
     __PCPU_DUMMY_ATTRS char __pcpu_unique_##name;   \
                             ^
   include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION'
     DEFINE_PER_CPU_SECTION(type, name, "")
     ^
   drivers/char/random.c:779:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(int, next_pool);
              ^
   include/linux/percpu-defs.h:91:33: note: previous declaration of '__pcpu_unique_next_pool' was here
     extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name;  \
                                    ^
   include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION'
     DEFINE_PER_CPU_SECTION(type, name, "")
     ^
   drivers/char/random.c:779:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(int, next_pool);
              ^
   drivers/char/random.c:779:31: error: section attribute cannot be specified for local variables
       static DEFINE_PER_CPU(int, next_pool);
                                  ^
   include/linux/percpu-defs.h:93:44: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
     extern __PCPU_ATTRS(sec) __typeof__(type) name;   \
                                               ^
   drivers/char/random.c:779:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(int, next_pool);
              ^
   drivers/char/random.c:779:31: error: section attribute cannot be specified for local variables
       static DEFINE_PER_CPU(int, next_pool);
                                  ^
   include/linux/percpu-defs.h:95:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
     __typeof__(type) name
                      ^
   drivers/char/random.c:779:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(int, next_pool);
              ^
>> drivers/char/random.c:779:31: error: weak declaration of 'next_pool' must be public
       static DEFINE_PER_CPU(int, next_pool);
                                  ^
   include/linux/percpu-defs.h:95:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
     __typeof__(type) name
                      ^
   drivers/char/random.c:779:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(int, next_pool);
              ^
>> drivers/char/random.c:779:31: error: declaration of 'next_pool' with no linkage follows extern declaration
       static DEFINE_PER_CPU(int, next_pool);
                                  ^
   include/linux/percpu-defs.h:95:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
     __typeof__(type) name
                      ^
   drivers/char/random.c:779:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(int, next_pool);
              ^
   drivers/char/random.c:779:31: note: previous declaration of 'next_pool' was here
       static DEFINE_PER_CPU(int, next_pool);
                                  ^
   include/linux/percpu-defs.h:93:44: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
     extern __PCPU_ATTRS(sec) __typeof__(type) name;   \
                                               ^
   drivers/char/random.c:779:11: note: in expansion of macro 'DEFINE_PER_CPU'
       static DEFINE_PER_CPU(int, next_pool);
              ^

vim +777 drivers/char/random.c

   771			 * full.
   772			 * Feed into all pools round robin.
   773			 */
   774			if (entropy_bits > random_write_wakeup_bits &&
   775			    r->initialized &&
   776			    r->entropy_total >= 2*random_read_wakeup_bits) {
 > 777				static DEFINE_PER_CPU(struct entropy_store *, lastp) =
   778					&blocking_pool;
 > 779				static DEFINE_PER_CPU(int, next_pool);
   780				struct entropy_store *other = &blocking_pool, *last;
   781				int np;
   782	

---
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