[2/3] drm/i915: work around false-positive maybe-uninitialized warning
diff mbox series

Message ID 20200527140526.1458215-2-arnd@arndb.de
State New
Headers show
Series
  • [1/3] drm/i915/pmu: avoid an maybe-uninitialized warning
Related show

Commit Message

Arnd Bergmann May 27, 2020, 2:05 p.m. UTC
gcc-9 gets confused by the code flow in check_dirty_whitelist:

drivers/gpu/drm/i915/gt/selftest_workarounds.c: In function 'check_dirty_whitelist':
drivers/gpu/drm/i915/gt/selftest_workarounds.c:492:17: error: 'rsvd' may be used uninitialized in this function [-Werror=maybe-uninitialized]

I could not figure out a good way to do this in a way that gcc
understands better, so initialize the variable to zero, as last
resort.

Fixes: aee20aaed887 ("drm/i915: Implement read-only support in whitelist selftest")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/gpu/drm/i915/gt/selftest_workarounds.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Chris Wilson May 27, 2020, 3:43 p.m. UTC | #1
Quoting Arnd Bergmann (2020-05-27 15:05:09)
> gcc-9 gets confused by the code flow in check_dirty_whitelist:
> 
> drivers/gpu/drm/i915/gt/selftest_workarounds.c: In function 'check_dirty_whitelist':
> drivers/gpu/drm/i915/gt/selftest_workarounds.c:492:17: error: 'rsvd' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> I could not figure out a good way to do this in a way that gcc
> understands better, so initialize the variable to zero, as last
> resort.

Does it look neater if we initialise it as a local? No.
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris

Patch
diff mbox series

diff --git a/drivers/gpu/drm/i915/gt/selftest_workarounds.c b/drivers/gpu/drm/i915/gt/selftest_workarounds.c
index 5ed323254ee1..32785463ec9e 100644
--- a/drivers/gpu/drm/i915/gt/selftest_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/selftest_workarounds.c
@@ -623,6 +623,8 @@  static int check_dirty_whitelist(struct intel_context *ce)
 				err = -EINVAL;
 				goto out_unpin;
 			}
+		} else {
+			rsvd = 0;
 		}
 
 		expect = results[0];