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| author | Nathan Chancellor <nathan@kernel.org> | 2023-07-19 00:44:20 +0300 |
|---|---|---|
| committer | Maíra Canal <mairacanal@riseup.net> | 2023-07-27 19:01:28 +0300 |
| commit | aeedd3a82678d89627bdd020a28e0af35ff45552 (patch) | |
| tree | e7067c1c6d8d19d5ac7bc43d3e87e14a13688b73 /drivers/gpu | |
| parent | b27211db61aed86f095e76aa61eaef3bf3e0b7c2 (diff) | |
| download | linux-aeedd3a82678d89627bdd020a28e0af35ff45552.tar.xz | |
drm/i915: Avoid -Wconstant-logical-operand in nsecs_to_jiffies_timeout()
A proposed update to clang's -Wconstant-logical-operand to warn when the
left hand side is a constant shows the following instance in
nsecs_to_jiffies_timeout() when NSEC_PER_SEC is not a multiple of HZ,
such as CONFIG_HZ=300:
drivers/gpu/drm/i915/gem/i915_gem_wait.c:189:24: warning: use of logical '&&' with constant operand [-Wconstant-logical-operand]
189 | if (NSEC_PER_SEC % HZ &&
| ~~~~~~~~~~~~~~~~~ ^
drivers/gpu/drm/i915/gem/i915_gem_wait.c:189:24: note: use '&' for a bitwise operation
189 | if (NSEC_PER_SEC % HZ &&
| ^~
| &
drivers/gpu/drm/i915/gem/i915_gem_wait.c:189:24: note: remove constant to silence this warning
1 warning generated.
Turn this into an explicit comparison against zero to make the
expression a boolean to make it clear this should be a logical check,
not a bitwise one.
Link: https://reviews.llvm.org/D142609
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Maíra Canal <mairacanal@riseup.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20230718-nsecs_to_jiffies_timeout-constant-logical-operand-v1-2-36ed8fc8faea@kernel.org
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_wait.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_wait.c b/drivers/gpu/drm/i915/gem/i915_gem_wait.c index 4a33ad2d122b..d4b918fb11ce 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_wait.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_wait.c @@ -186,7 +186,7 @@ i915_gem_object_wait(struct drm_i915_gem_object *obj, static inline unsigned long nsecs_to_jiffies_timeout(const u64 n) { /* nsecs_to_jiffies64() does not guard against overflow */ - if (NSEC_PER_SEC % HZ && + if ((NSEC_PER_SEC % HZ) != 0 && div_u64(n, NSEC_PER_SEC) >= MAX_JIFFY_OFFSET / HZ) return MAX_JIFFY_OFFSET; |