On Thu, Apr 30, 2015 at 02:59:34PM +0100, Michel Thierry wrote:
> The patch 69876bed7e008f5fe01538a2d47c09f2862129d0: "drm/i915/gen8:
> page directories rework allocation" added an overflow warning, but the
> mask had an extra 0. Use typo-prone option suggested by Dave instead.
>
> This check will be unnecessary after gen8_alloc_va_range handles more
> than 4 PDPs (48b addressing).
>
> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> Cc: Dave Gordon <david.s.gordon@xxxxxxxxx>
> Signed-off-by: Michel Thierry <michel.thierry@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_gem_gtt.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index 6fae6bd..6d894fc 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -756,8 +756,8 @@ static int gen8_ppgtt_alloc_page_directories(struct i915_hw_ppgtt *ppgtt,
>
> WARN_ON(!bitmap_empty(new_pds, GEN8_LEGACY_PDPES));
>
> - /* FIXME: PPGTT container_of won't work for 64b */
> - WARN_ON((start + length) > 0x800000000ULL);
> + /* FIXME: upper bound must not overflow 31 bits */
> + WARN_ON((start + length) & (~0ULL << 31));
Why is it 31 and not 32?
>
> gen8_for_each_pdpe(pd, pdp, start, length, temp, pdpe) {
> if (pd)
> --
> 2.1.1
>
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--
Ville Syrjälä
Intel OTC
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