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> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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