[Intel-gfx] [PATCH] [v2] i915: fix shift warning

Chris Wilson chris at chris-wilson.co.uk
Sun Jan 3 14:01:59 UTC 2021

Quoting Arnd Bergmann (2021-01-03 13:51:44)
> From: Arnd Bergmann <arnd at arndb.de>
> Randconfig builds on 32-bit machines show lots of warnings for
> the i915 driver for passing a 32-bit value into __const_hweight64():
> drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c:2584:9: error: shift count >= width of type [-Werror,-Wshift-count-overflow]
>         return hweight64(VDBOX_MASK(&i915->gt));
>                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> include/asm-generic/bitops/const_hweight.h:29:49: note: expanded from macro 'hweight64'
>  #define hweight64(w) (__builtin_constant_p(w) ? __const_hweight64(w) : __arch_hweight64(w))
> Change it to hweight_long() to avoid the warning.
> Signed-off-by: Arnd Bergmann <arnd at arndb.de>
Reviewed-by:: Chris Wilson <chris at chris-wilson.co.uk>

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