Re: [PATCH] vhost: replace % with & on data path

From: kbuild test robot
Date: Mon Nov 30 2015 - 04:19:14 EST

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Next in thread: David Miller: "Re: [PATCH] vhost: replace % with & on data path"
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Hi Michael,

[auto build test ERROR on: v4.4-rc3]
[also build test ERROR on: next-20151127]

url: https://github.com/0day-ci/linux/commits/Michael-S-Tsirkin/vhost-replace-with-on-data-path/20151130-163704
config: x86_64-randconfig-s0-11301655 (attached as .config)
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64

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

drivers/vhost/vhost.c: In function 'vhost_get_vq_desc':
drivers/vhost/vhost.c:1345:6: warning: unused variable 'ret' [-Wunused-variable]
int ret;
^
drivers/vhost/vhost.c:1344:13: warning: unused variable 'ring_head' [-Wunused-variable]
__virtio16 ring_head;
^
drivers/vhost/vhost.c:1341:24: warning: unused variable 'found' [-Wunused-variable]
unsigned int i, head, found = 0;
^
drivers/vhost/vhost.c:1341:18: warning: unused variable 'head' [-Wunused-variable]
unsigned int i, head, found = 0;
^
drivers/vhost/vhost.c:1341:15: warning: unused variable 'i' [-Wunused-variable]
unsigned int i, head, found = 0;
^
drivers/vhost/vhost.c:1340:20: warning: unused variable 'desc' [-Wunused-variable]
struct vring_desc desc;
^
In file included from include/uapi/linux/stddef.h:1:0,
from include/linux/stddef.h:4,
from include/uapi/linux/posix_types.h:4,
from include/uapi/linux/types.h:13,
from include/linux/types.h:5,
from include/uapi/asm-generic/fcntl.h:4,
from arch/x86/include/uapi/asm/fcntl.h:1,
from include/uapi/linux/fcntl.h:4,
from include/linux/fcntl.h:4,
from include/linux/eventfd.h:11,
from drivers/vhost/vhost.c:14:
drivers/vhost/vhost.c: At top level:
>> include/linux/compiler.h:147:2: error: expected identifier or '(' before 'if'
if (__builtin_constant_p((cond)) ? !!(cond) : \
^
include/linux/compiler.h:145:23: note: in expansion of macro '__trace_if'
#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
^
>> drivers/vhost/vhost.c:1373:2: note: in expansion of macro 'if'
if (unlikely(__get_user(ring_head,
^
arch/x86/include/asm/uaccess.h:414:2: error: expected identifier or '(' before ')' token
})
^
include/linux/compiler.h:147:28: note: in definition of macro '__trace_if'
if (__builtin_constant_p((cond)) ? !!(cond) : \
^
>> drivers/vhost/vhost.c:1373:2: note: in expansion of macro 'if'
if (unlikely(__get_user(ring_head,
^
drivers/vhost/vhost.c:1373:6: note: in expansion of macro 'unlikely'
if (unlikely(__get_user(ring_head,
^
arch/x86/include/asm/uaccess.h:479:2: note: in expansion of macro '__get_user_nocheck'
__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
^
drivers/vhost/vhost.c:1373:15: note: in expansion of macro '__get_user'
if (unlikely(__get_user(ring_head,
^
arch/x86/include/asm/uaccess.h:414:2: error: expected identifier or '(' before ')' token
})
^
include/linux/compiler.h:147:28: note: in definition of macro '__trace_if'
if (__builtin_constant_p((cond)) ? !!(cond) : \
^
>> drivers/vhost/vhost.c:1373:2: note: in expansion of macro 'if'
if (unlikely(__get_user(ring_head,
^
drivers/vhost/vhost.c:1373:6: note: in expansion of macro 'unlikely'
if (unlikely(__get_user(ring_head,
^
arch/x86/include/asm/uaccess.h:479:2: note: in expansion of macro '__get_user_nocheck'
__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
^
drivers/vhost/vhost.c:1373:15: note: in expansion of macro '__get_user'
if (unlikely(__get_user(ring_head,
^
include/linux/compiler.h:126:4: error: expected identifier or '(' before ')' token
})
^
include/linux/compiler.h:147:28: note: in definition of macro '__trace_if'
if (__builtin_constant_p((cond)) ? !!(cond) : \
^
>> drivers/vhost/vhost.c:1373:2: note: in expansion of macro 'if'
if (unlikely(__get_user(ring_head,
^
include/linux/compiler.h:137:58: note: in expansion of macro '__branch_check__'
# define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
^
drivers/vhost/vhost.c:1373:6: note: in expansion of macro 'unlikely'
if (unlikely(__get_user(ring_head,
^
arch/x86/include/asm/uaccess.h:414:2: error: expected identifier or '(' before ')' token
})
^
include/linux/compiler.h:147:40: note: in definition of macro '__trace_if'
if (__builtin_constant_p((cond)) ? !!(cond) : \
^
>> drivers/vhost/vhost.c:1373:2: note: in expansion of macro 'if'
if (unlikely(__get_user(ring_head,
^
drivers/vhost/vhost.c:1373:6: note: in expansion of macro 'unlikely'
if (unlikely(__get_user(ring_head,
^
arch/x86/include/asm/uaccess.h:479:2: note: in expansion of macro '__get_user_nocheck'
__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
^
drivers/vhost/vhost.c:1373:15: note: in expansion of macro '__get_user'
if (unlikely(__get_user(ring_head,
^
arch/x86/include/asm/uaccess.h:414:2: error: expected identifier or '(' before ')' token
})
^
include/linux/compiler.h:147:40: note: in definition of macro '__trace_if'
if (__builtin_constant_p((cond)) ? !!(cond) : \
^
>> drivers/vhost/vhost.c:1373:2: note: in expansion of macro 'if'
if (unlikely(__get_user(ring_head,
^
drivers/vhost/vhost.c:1373:6: note: in expansion of macro 'unlikely'
if (unlikely(__get_user(ring_head,
^
arch/x86/include/asm/uaccess.h:479:2: note: in expansion of macro '__get_user_nocheck'
__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
^
drivers/vhost/vhost.c:1373:15: note: in expansion of macro '__get_user'
if (unlikely(__get_user(ring_head,
^
include/linux/compiler.h:126:4: error: expected identifier or '(' before ')' token
})
^
include/linux/compiler.h:147:40: note: in definition of macro '__trace_if'
if (__builtin_constant_p((cond)) ? !!(cond) : \
^
>> drivers/vhost/vhost.c:1373:2: note: in expansion of macro 'if'
if (unlikely(__get_user(ring_head,
^
include/linux/compiler.h:137:58: note: in expansion of macro '__branch_check__'
# define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
^
drivers/vhost/vhost.c:1373:6: note: in expansion of macro 'unlikely'
if (unlikely(__get_user(ring_head,
^
include/linux/compiler.h:161:3: error: expected identifier or '(' before ')' token
}))
^
include/linux/compiler.h:145:23: note: in expansion of macro '__trace_if'
#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
^
>> drivers/vhost/vhost.c:1373:2: note: in expansion of macro 'if'
if (unlikely(__get_user(ring_head,
^
drivers/vhost/vhost.c:1381:2: warning: data definition has no type or storage class
head = vhost16_to_cpu(vq, ring_head);
^
drivers/vhost/vhost.c:1381:2: error: type defaults to 'int' in declaration of 'head' [-Werror=implicit-int]
drivers/vhost/vhost.c:1381:24: error: 'vq' undeclared here (not in a function)
head = vhost16_to_cpu(vq, ring_head);
^
drivers/vhost/vhost.c:1381:28: error: 'ring_head' undeclared here (not in a function)
head = vhost16_to_cpu(vq, ring_head);
^
In file included from include/uapi/linux/stddef.h:1:0,
from include/linux/stddef.h:4,
from include/uapi/linux/posix_types.h:4,
from include/uapi/linux/types.h:13,
from include/linux/types.h:5,
from include/uapi/asm-generic/fcntl.h:4,
from arch/x86/include/uapi/asm/fcntl.h:1,
from include/uapi/linux/fcntl.h:4,
from include/linux/fcntl.h:4,
from include/linux/eventfd.h:11,
from drivers/vhost/vhost.c:14:
>> include/linux/compiler.h:147:2: error: expected identifier or '(' before 'if'
if (__builtin_constant_p((cond)) ? !!(cond) : \
^
include/linux/compiler.h:145:23: note: in expansion of macro '__trace_if'
#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
^
drivers/vhost/vhost.c:1384:2: note: in expansion of macro 'if'
if (unlikely(head >= vq->num)) {
^
include/linux/compiler.h:126:4: error: expected identifier or '(' before ')' token
})
^
include/linux/compiler.h:147:28: note: in definition of macro '__trace_if'
if (__builtin_constant_p((cond)) ? !!(cond) : \
^
drivers/vhost/vhost.c:1384:2: note: in expansion of macro 'if'
if (unlikely(head >= vq->num)) {
^
include/linux/compiler.h:137:58: note: in expansion of macro '__branch_check__'
# define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
^
drivers/vhost/vhost.c:1384:6: note: in expansion of macro 'unlikely'
if (unlikely(head >= vq->num)) {
^
include/linux/compiler.h:126:4: error: expected identifier or '(' before ')' token
})
^
include/linux/compiler.h:147:40: note: in definition of macro '__trace_if'
if (__builtin_constant_p((cond)) ? !!(cond) : \
^
drivers/vhost/vhost.c:1384:2: note: in expansion of macro 'if'
if (unlikely(head >= vq->num)) {
^
include/linux/compiler.h:137:58: note: in expansion of macro '__branch_check__'
# define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
^
drivers/vhost/vhost.c:1384:6: note: in expansion of macro 'unlikely'
if (unlikely(head >= vq->num)) {
^
include/linux/compiler.h:161:3: error: expected identifier or '(' before ')' token
}))
^
include/linux/compiler.h:145:23: note: in expansion of macro '__trace_if'
#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
^
drivers/vhost/vhost.c:1384:2: note: in expansion of macro 'if'
if (unlikely(head >= vq->num)) {
^
drivers/vhost/vhost.c:1391:2: warning: data definition has no type or storage class
*out_num = *in_num = 0;
^
drivers/vhost/vhost.c:1391:3: error: type defaults to 'int' in declaration of 'out_num' [-Werror=implicit-int]
*out_num = *in_num = 0;
^
drivers/vhost/vhost.c:1391:14: error: 'in_num' undeclared here (not in a function)
*out_num = *in_num = 0;
^
In file included from include/uapi/linux/stddef.h:1:0,
from include/linux/stddef.h:4,
from include/uapi/linux/posix_types.h:4,
from include/uapi/linux/types.h:13,
from include/linux/types.h:5,
from include/uapi/asm-generic/fcntl.h:4,
from arch/x86/include/uapi/asm/fcntl.h:1,
from include/uapi/linux/fcntl.h:4,
from include/linux/fcntl.h:4,
from include/linux/eventfd.h:11,
from drivers/vhost/vhost.c:14:
>> include/linux/compiler.h:147:2: error: expected identifier or '(' before 'if'
if (__builtin_constant_p((cond)) ? !!(cond) : \
^
include/linux/compiler.h:145:23: note: in expansion of macro '__trace_if'
#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
^
drivers/vhost/vhost.c:1392:2: note: in expansion of macro 'if'
if (unlikely(log))
^
include/linux/compiler.h:126:4: error: expected identifier or '(' before ')' token
})
^
include/linux/compiler.h:147:28: note: in definition of macro '__trace_if'
if (__builtin_constant_p((cond)) ? !!(cond) : \
^
drivers/vhost/vhost.c:1392:2: note: in expansion of macro 'if'
if (unlikely(log))
^
include/linux/compiler.h:137:58: note: in expansion of macro '__branch_check__'
# define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
^
drivers/vhost/vhost.c:1392:6: note: in expansion of macro 'unlikely'
if (unlikely(log))
^
include/linux/compiler.h:126:4: error: expected identifier or '(' before ')' token
})
^
include/linux/compiler.h:147:40: note: in definition of macro '__trace_if'
if (__builtin_constant_p((cond)) ? !!(cond) : \
^
drivers/vhost/vhost.c:1392:2: note: in expansion of macro 'if'
if (unlikely(log))
^
include/linux/compiler.h:137:58: note: in expansion of macro '__branch_check__'
# define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
^
drivers/vhost/vhost.c:1392:6: note: in expansion of macro 'unlikely'
if (unlikely(log))
^
include/linux/compiler.h:161:3: error: expected identifier or '(' before ')' token
}))
^
include/linux/compiler.h:145:23: note: in expansion of macro '__trace_if'
#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
^
drivers/vhost/vhost.c:1392:2: note: in expansion of macro 'if'
if (unlikely(log))
^
drivers/vhost/vhost.c:1395:2: warning: data definition has no type or storage class
i = head;
^
drivers/vhost/vhost.c:1395:2: error: type defaults to 'int' in declaration of 'i' [-Werror=implicit-int]
drivers/vhost/vhost.c:1395:6: error: initializer element is not constant
i = head;
^
drivers/vhost/vhost.c:1396:2: error: expected identifier or '(' before 'do'
do {
^
drivers/vhost/vhost.c:1454:4: error: expected identifier or '(' before 'while'
} while ((i = next_desc(vq, &desc)) != -1);
^
drivers/vhost/vhost.c:1457:4: error: expected '=', ',', ';', 'asm' or '__attribute__' before '->' token
vq->last_avail_idx++;
^
In file included from arch/x86/include/asm/bug.h:35:0,
from include/linux/bug.h:4,
from include/linux/thread_info.h:11,
from arch/x86/include/asm/preempt.h:6,
from include/linux/preempt.h:59,
from include/linux/spinlock.h:50,
from include/linux/wait.h:8,
from include/linux/eventfd.h:12,
from drivers/vhost/vhost.c:14:
include/asm-generic/bug.h:55:27: error: expected identifier or '(' before 'do'
#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
^
drivers/vhost/vhost.c:1461:2: note: in expansion of macro 'BUG_ON'
BUG_ON(!(vq->used_flags & VRING_USED_F_NO_NOTIFY));
^
include/asm-generic/bug.h:55:66: error: expected identifier or '(' before 'while'
#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
^
drivers/vhost/vhost.c:1461:2: note: in expansion of macro 'BUG_ON'
BUG_ON(!(vq->used_flags & VRING_USED_F_NO_NOTIFY));
^
drivers/vhost/vhost.c:1462:2: error: expected identifier or '(' before 'return'
return head;
^
drivers/vhost/vhost.c:1463:1: error: expected identifier or '(' before '}' token
}
^
drivers/vhost/vhost.c:1235:12: warning: 'get_indirect' defined but not used [-Wunused-function]
static int get_indirect(struct vhost_virtqueue *vq,
^
drivers/vhost/vhost.c: In function 'vhost_get_vq_desc':
drivers/vhost/vhost.c:1369:2: warning: control reaches end of non-void function [-Wreturn-type]
}
^
cc1: some warnings being treated as errors

vim +/if +1373 drivers/vhost/vhost.c

3a4d5c94 Michael S. Tsirkin 2010-01-14 1357 vq_err(vq, "Guest moved used index from %u to %u",
3a4d5c94 Michael S. Tsirkin 2010-01-14 1358 last_avail_idx, vq->avail_idx);
d5675bd2 Michael S. Tsirkin 2010-06-24 1359 return -EFAULT;
3a4d5c94 Michael S. Tsirkin 2010-01-14 1360 }
3a4d5c94 Michael S. Tsirkin 2010-01-14 1361
3a4d5c94 Michael S. Tsirkin 2010-01-14 1362 /* If there's nothing new since last we looked, return invalid. */
3a4d5c94 Michael S. Tsirkin 2010-01-14 1363 if (vq->avail_idx == last_avail_idx)
3a4d5c94 Michael S. Tsirkin 2010-01-14 1364 return vq->num;
3a4d5c94 Michael S. Tsirkin 2010-01-14 1365
3a4d5c94 Michael S. Tsirkin 2010-01-14 1366 /* Only get avail ring entries after they have been exposed by guest. */
5659338c Michael S. Tsirkin 2010-02-01 1367 smp_rmb();
3a4d5c94 Michael S. Tsirkin 2010-01-14 1368
07a08023 Michael S. Tsirkin 2015-11-30 1369 }
07a08023 Michael S. Tsirkin 2015-11-30 1370
3a4d5c94 Michael S. Tsirkin 2010-01-14 1371 /* Grab the next descriptor number they're advertising, and increment
3a4d5c94 Michael S. Tsirkin 2010-01-14 1372 * the index we've seen. */
3b1bbe89 Michael S. Tsirkin 2014-10-24 @1373 if (unlikely(__get_user(ring_head,
07a08023 Michael S. Tsirkin 2015-11-30 1374 &vq->avail->ring[last_avail_idx & (vq->num - 1)]))) {
3a4d5c94 Michael S. Tsirkin 2010-01-14 1375 vq_err(vq, "Failed to read head: idx %d address %p\n",
3a4d5c94 Michael S. Tsirkin 2010-01-14 1376 last_avail_idx,
3a4d5c94 Michael S. Tsirkin 2010-01-14 1377 &vq->avail->ring[last_avail_idx % vq->num]);
d5675bd2 Michael S. Tsirkin 2010-06-24 1378 return -EFAULT;
3a4d5c94 Michael S. Tsirkin 2010-01-14 1379 }
3a4d5c94 Michael S. Tsirkin 2010-01-14 1380
3b1bbe89 Michael S. Tsirkin 2014-10-24 1381 head = vhost16_to_cpu(vq, ring_head);

:::::: The code at line 1373 was first introduced by commit
:::::: 3b1bbe89351a8003857aeb5cbef3595f5d0ee609 vhost: virtio 1.0 endian-ness support

:::::: TO: Michael S. Tsirkin <mst@xxxxxxxxxx>
:::::: CC: Michael S. Tsirkin <mst@xxxxxxxxxx>

---
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