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SubjectRe: [PATCH] virtio-mmio: harden interrupt
Hi Jason,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.16-rc2 next-20211125]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url: https://github.com/0day-ci/linux/commits/Jason-Wang/virtio-mmio-harden-interrupt/20211125-143334
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5f53fa508db098c9d372423a6dac31c8a5679cdf
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20211125/202111251934.ybhaqyh7-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/0day-ci/linux/commit/e19a8a1a95bd891090863b2d6828b8dc55d3633f
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Jason-Wang/virtio-mmio-harden-interrupt/20211125-143334
git checkout e19a8a1a95bd891090863b2d6828b8dc55d3633f
# save the config file to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=m68k

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/virtio/virtio_mmio.c:105:6: warning: no previous prototype for 'vm_disable_cbs' [-Wmissing-prototypes]
105 | void vm_disable_cbs(struct virtio_device *vdev)
| ^~~~~~~~~~~~~~
>> drivers/virtio/virtio_mmio.c:121:6: warning: no previous prototype for 'vm_enable_cbs' [-Wmissing-prototypes]
121 | void vm_enable_cbs(struct virtio_device *vdev)
| ^~~~~~~~~~~~~


vim +/vm_disable_cbs +105 drivers/virtio/virtio_mmio.c

103
104 /* disable irq handlers */
> 105 void vm_disable_cbs(struct virtio_device *vdev)
106 {
107 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
108 int irq = platform_get_irq(vm_dev->pdev, 0);
109
110 /*
111 * The below synchronize() guarantees that any
112 * interrupt for this line arriving after
113 * synchronize_irq() has completed is guaranteed to see
114 * intx_soft_enabled == false.
115 */
116 WRITE_ONCE(vm_dev->intr_soft_enabled, false);
117 synchronize_irq(irq);
118 }
119
120 /* enable irq handlers */
> 121 void vm_enable_cbs(struct virtio_device *vdev)
122 {
123 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
124 int irq = platform_get_irq(vm_dev->pdev, 0);
125
126 disable_irq(irq);
127 /*
128 * The above disable_irq() provides TSO ordering and
129 * as such promotes the below store to store-release.
130 */
131 WRITE_ONCE(vm_dev->intr_soft_enabled, true);
132 enable_irq(irq);
133 return;
134 }
135

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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