| Message ID | 20200211050808.29463-1-natechancellor@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/i915: Disable -Wtautological-constant-out-of-range-compare | expand |
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 38df01c23176..55dbcca179c7 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -21,6 +21,7 @@ subdir-ccflags-y += $(call cc-disable-warning, unused-but-set-variable) subdir-ccflags-y += $(call cc-disable-warning, sign-compare) subdir-ccflags-y += $(call cc-disable-warning, sometimes-uninitialized) subdir-ccflags-y += $(call cc-disable-warning, initializer-overrides) +subdir-ccflags-y += $(call cc-disable-warning, tautological-constant-out-of-range-compare) subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror # Fine grained warnings disable
A recent commit in clang added -Wtautological-compare to -Wall, which is enabled for i915 so we see the following warning: ../drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c:1485:22: warning: result of comparison of constant 576460752303423487 with expression of type 'unsigned int' is always false [-Wtautological-constant-out-of-range-compare] if (unlikely(remain > N_RELOC(ULONG_MAX))) ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~ This warning only happens on x86_64 but that check is relevant for 32-bit x86 so we cannot remove it. -Wtautological-compare on a whole has good warnings but this one is not really relevant for the kernel because of all of the different configurations that are used to build the kernel. When -Wtautological-compare is enabled for the kernel, this option will remain disabled so do that for i915 now. Link: https://github.com/ClangBuiltLinux/linux/issues/778 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> --- drivers/gpu/drm/i915/Makefile | 1 + 1 file changed, 1 insertion(+)