Re: drivers/crypto/virtio/virtio_crypto_common.h:116:13: warning: variable 'cpu' set but not used

[Michael S. Tsirkin]

On Mon, Dec 04, 2023 at 03:55:43AM +0800, kernel test robot wrote:
> Hi Gonglei,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   33cc938e65a98f1d29d0a18403dbbee050dcad9a
> commit: dbaf0624ffa57ae6e7d87a823185ccd9a7852d3c crypto: add virtio-crypto driver
> date:   7 years ago
> config: x86_64-randconfig-015-20231011 (https://download.01.org/0day-ci/archive/20231204/202312040315.kPrI1OCE-lkp@xxxxxxxxx/config)
> compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231204/202312040315.kPrI1OCE-lkp@xxxxxxxxx/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202312040315.kPrI1OCE-lkp@xxxxxxxxx/
> 
> All warnings (new ones prefixed by >>):
> 
>    In file included from drivers/crypto/virtio/virtio_crypto_algs.c:28:
>    drivers/crypto/virtio/virtio_crypto_common.h: In function 'virtio_crypto_get_current_node':
> >> drivers/crypto/virtio/virtio_crypto_common.h:116:13: warning: variable 'cpu' set but not used [-Wunused-but-set-variable]
>      116 |         int cpu, node;
>          |             ^~~
> --
>    In file included from drivers/crypto/virtio/virtio_crypto_core.c:25:
>    drivers/crypto/virtio/virtio_crypto_common.h: In function 'virtio_crypto_get_current_node':
> >> drivers/crypto/virtio/virtio_crypto_common.h:116:13: warning: variable 'cpu' set but not used [-Wunused-but-set-variable]
>      116 |         int cpu, node;
>          |             ^~~
>    In file included from drivers/crypto/virtio/virtio_crypto_core.c:20:
>    drivers/crypto/virtio/virtio_crypto_core.c: At top level:
>    include/linux/module.h:132:13: warning: 'init_module' specifies less restrictive attribute than its target 'virtio_crypto_driver_init': 'cold' [-Wmissing-attributes]
>      132 |         int init_module(void) __attribute__((alias(#initfn)));
>          |             ^~~~~~~~~~~
>    include/linux/device.h:1463:1: note: in expansion of macro 'module_init'
>     1463 | module_init(__driver##_init); \
>          | ^~~~~~~~~~~
>    include/linux/virtio.h:190:9: note: in expansion of macro 'module_driver'
>      190 |         module_driver(__virtio_driver, register_virtio_driver, \
>          |         ^~~~~~~~~~~~~
>    drivers/crypto/virtio/virtio_crypto_core.c:471:1: note: in expansion of macro 'module_virtio_driver'
>      471 | module_virtio_driver(virtio_crypto_driver);
>          | ^~~~~~~~~~~~~~~~~~~~
>    In file included from include/linux/virtio.h:8,
>                     from include/linux/virtio_config.h:6,
>                     from drivers/crypto/virtio/virtio_crypto_core.c:21:
>    drivers/crypto/virtio/virtio_crypto_core.c:471:22: note: 'init_module' target declared here
>      471 | module_virtio_driver(virtio_crypto_driver);
>          |                      ^~~~~~~~~~~~~~~~~~~~
>    include/linux/device.h:1459:19: note: in definition of macro 'module_driver'
>     1459 | static int __init __driver##_init(void) \
>          |                   ^~~~~~~~
>    drivers/crypto/virtio/virtio_crypto_core.c:471:1: note: in expansion of macro 'module_virtio_driver'
>      471 | module_virtio_driver(virtio_crypto_driver);
>          | ^~~~~~~~~~~~~~~~~~~~
>    include/linux/module.h:138:14: warning: 'cleanup_module' specifies less restrictive attribute than its target 'virtio_crypto_driver_exit': 'cold' [-Wmissing-attributes]
>      138 |         void cleanup_module(void) __attribute__((alias(#exitfn)));
>          |              ^~~~~~~~~~~~~~
>    include/linux/device.h:1468:1: note: in expansion of macro 'module_exit'
>     1468 | module_exit(__driver##_exit);
>          | ^~~~~~~~~~~
>    include/linux/virtio.h:190:9: note: in expansion of macro 'module_driver'
>      190 |         module_driver(__virtio_driver, register_virtio_driver, \
>          |         ^~~~~~~~~~~~~
>    drivers/crypto/virtio/virtio_crypto_core.c:471:1: note: in expansion of macro 'module_virtio_driver'
>      471 | module_virtio_driver(virtio_crypto_driver);
>          | ^~~~~~~~~~~~~~~~~~~~
>    drivers/crypto/virtio/virtio_crypto_core.c:471:22: note: 'cleanup_module' target declared here
>      471 | module_virtio_driver(virtio_crypto_driver);
>          |                      ^~~~~~~~~~~~~~~~~~~~
>    include/linux/device.h:1464:20: note: in definition of macro 'module_driver'
>     1464 | static void __exit __driver##_exit(void) \
>          |                    ^~~~~~~~
>    drivers/crypto/virtio/virtio_crypto_core.c:471:1: note: in expansion of macro 'module_virtio_driver'
>      471 | module_virtio_driver(virtio_crypto_driver);
>          | ^~~~~~~~~~~~~~~~~~~~
> 
> 
> vim +/cpu +116 drivers/crypto/virtio/virtio_crypto_common.h
> 
>    113	
>    114	static inline int virtio_crypto_get_current_node(void)
>    115	{
>  > 116		int cpu, node;
>    117	
>    118		cpu = get_cpu();
>    119		node = topology_physical_package_id(cpu);
>    120		put_cpu();
>    121	
>    122		return node;
>    123	}
>    124	
> 
> -- 
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki

Seems easy to fix. Gonglei?

-- 
MST