Re: [RFC PATCH 3/4] random: Only do mixback once per read

From: kbuild test robot
Date: Fri Oct 16 2015 - 02:13:26 EST

Hi George,

[auto build test ERROR on v4.3-rc5 -- if it's inappropriate base, please suggest rules for selecting the more suitable base]

url: https://github.com/0day-ci/linux/commits/George-Spelvin/Alternate-sclable-urandom-patchset/20151016-133627
config: i386-randconfig-i1-201541 (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:238:
drivers/char/random.c: In function 'extract_buf':
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:1134:9: note: in expansion of macro 'DEFINE_PER_CPU'
static DEFINE_PER_CPU(__u32, random_nonce);
^
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:1134:9: note: in expansion of macro 'DEFINE_PER_CPU'
static DEFINE_PER_CPU(__u32, random_nonce);
^
include/linux/percpu-defs.h:92:26: error: declaration of '__pcpu_unique_random_nonce' 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:1134:9: note: in expansion of macro 'DEFINE_PER_CPU'
static DEFINE_PER_CPU(__u32, random_nonce);
^
include/linux/percpu-defs.h:91:33: note: previous declaration of '__pcpu_unique_random_nonce' 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:1134:9: note: in expansion of macro 'DEFINE_PER_CPU'
static DEFINE_PER_CPU(__u32, random_nonce);
^
>> drivers/char/random.c:1134:31: error: section attribute cannot be specified for local variables
static DEFINE_PER_CPU(__u32, random_nonce);
^
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:1134:9: note: in expansion of macro 'DEFINE_PER_CPU'
static DEFINE_PER_CPU(__u32, random_nonce);
^
>> drivers/char/random.c:1134:31: error: section attribute cannot be specified for local variables
static DEFINE_PER_CPU(__u32, random_nonce);
^
include/linux/percpu-defs.h:95:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
__typeof__(type) name
^
drivers/char/random.c:1134:9: note: in expansion of macro 'DEFINE_PER_CPU'
static DEFINE_PER_CPU(__u32, random_nonce);
^
>> drivers/char/random.c:1134:31: error: weak declaration of 'random_nonce' must be public
static DEFINE_PER_CPU(__u32, random_nonce);
^
include/linux/percpu-defs.h:95:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
__typeof__(type) name
^
drivers/char/random.c:1134:9: note: in expansion of macro 'DEFINE_PER_CPU'
static DEFINE_PER_CPU(__u32, random_nonce);
^
>> drivers/char/random.c:1134:31: error: declaration of 'random_nonce' with no linkage follows extern declaration
static DEFINE_PER_CPU(__u32, random_nonce);
^
include/linux/percpu-defs.h:95:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
__typeof__(type) name
^
drivers/char/random.c:1134:9: note: in expansion of macro 'DEFINE_PER_CPU'
static DEFINE_PER_CPU(__u32, random_nonce);
^
drivers/char/random.c:1134:31: note: previous declaration of 'random_nonce' was here
static DEFINE_PER_CPU(__u32, random_nonce);
^
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:1134:9: note: in expansion of macro 'DEFINE_PER_CPU'
static DEFINE_PER_CPU(__u32, random_nonce);
^

vim +1134 drivers/char/random.c

1128 union {
1129 __u32 w[5];
1130 unsigned long l[LONGS(16)];
1131 } hash;
1132 __u32 nonce;
1133 __u32 workspace[SHA_WORKSPACE_WORDS];
> 1134 static DEFINE_PER_CPU(__u32, random_nonce);
1135
1136 /*
1137 * If we have an architectural hardware random number

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