[PATCH] drm/i915: Use might_alloc()

[kernel test robot]

Hi Bernard,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm-intel/for-linux-next]
[also build test ERROR on v5.12 next-20210429]
[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/Bernard-Zhao/drm-i915-Use-might_alloc/20210429-104516
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: x86_64-rhel-8.3-kselftests (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/9fbd0c1741ce06241105d753ff3432ab55f3e94a
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Bernard-Zhao/drm-i915-Use-might_alloc/20210429-104516
        git checkout 9fbd0c1741ce06241105d753ff3432ab55f3e94a
        # save the attached .config to linux build tree
        make W=1 W=1 ARCH=x86_64 

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

All errors (new ones prefixed by >>):

   drivers/gpu/drm/i915/i915_sw_fence.c: In function '__i915_sw_fence_await_sw_fence':
>> drivers/gpu/drm/i915/i915_sw_fence.c:344:2: error: implicit declaration of function 'might_alloc'; did you mean 'might_lock'? [-Werror=implicit-function-declaration]
     344 |  might_alloc(gfp);
         |  ^~~~~~~~~~~
         |  might_lock
   cc1: some warnings being treated as errors


vim +344 drivers/gpu/drm/i915/i915_sw_fence.c

   335	
   336	static int __i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
   337						  struct i915_sw_fence *signaler,
   338						  wait_queue_entry_t *wq, gfp_t gfp)
   339	{
   340		unsigned int pending;
   341		unsigned long flags;
   342	
   343		debug_fence_assert(fence);
 > 344		might_alloc(gfp);
   345	
   346		if (i915_sw_fence_done(signaler)) {
   347			i915_sw_fence_set_error_once(fence, signaler->error);
   348			return 0;
   349		}
   350	
   351		debug_fence_assert(signaler);
   352	
   353		/* The dependency graph must be acyclic. */
   354		if (unlikely(i915_sw_fence_check_if_after(fence, signaler)))
   355			return -EINVAL;
   356	
   357		pending = I915_SW_FENCE_FLAG_FENCE;
   358		if (!wq) {
   359			wq = kmalloc(sizeof(*wq), gfp);
   360			if (!wq) {
   361				if (!gfpflags_allow_blocking(gfp))
   362					return -ENOMEM;
   363	
   364				i915_sw_fence_wait(signaler);
   365				i915_sw_fence_set_error_once(fence, signaler->error);
   366				return 0;
   367			}
   368	
   369			pending |= I915_SW_FENCE_FLAG_ALLOC;
   370		}
   371	
   372		INIT_LIST_HEAD(&wq->entry);
   373		wq->flags = pending;
   374		wq->func = i915_sw_fence_wake;
   375		wq->private = fence;
   376	
   377		i915_sw_fence_await(fence);
   378	
   379		spin_lock_irqsave(&signaler->wait.lock, flags);
   380		if (likely(!i915_sw_fence_done(signaler))) {
   381			__add_wait_queue_entry_tail(&signaler->wait, wq);
   382			pending = 1;
   383		} else {
   384			i915_sw_fence_wake(wq, 0, signaler->error, NULL);
   385			pending = 0;
   386		}
   387		spin_unlock_irqrestore(&signaler->wait.lock, flags);
   388	
   389		return pending;
   390	}
   391	

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