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| author |   Pavel Machek <pavel@ucw.cz> | 2014-07-28 13:20:58 +0200 |
|---|---|---|
| committer |   Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-08-07 11:07:15 +0200 |
| commit | 57007df74a547c68b3373861aa15efb861af6efc (patch) | |
| tree | 125ec19f397a0dbcac1dfb0ff6e797c9898f2bee /drivers/gpu/drm/i915/i915_gem_gtt.c | |
| parent | drm/i915: Update DRIVER_DATE to 20140725 (diff) | |
| download | linux-dev-57007df74a547c68b3373861aa15efb861af6efc.tar.xz linux-dev-57007df74a547c68b3373861aa15efb861af6efc.zip | |
drm/i915: work around warning in i915_gem_gtt
Gcc warns that addr might be used uninitialized. It may not, but I see
why gcc gets confused.
Additionally, hiding code with side-effects inside WARN_ON() argument
seems uncool, so I moved it outside.
Signed-off-by: Pavel Machek <pavel@ucw.cz>
[danvet: Add obligatory /* shuts up gcc */ comment.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_gtt.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_gtt.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 5188936bca0a..1411613f2174 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -1415,7 +1415,7 @@ static void gen8_ggtt_insert_entries(struct i915_address_space *vm, (gen8_gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry; int i = 0; struct sg_page_iter sg_iter; - dma_addr_t addr = 0; + dma_addr_t addr = 0; /* shut up gcc */ for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) { addr = sg_dma_address(sg_iter.sg) + @@ -1461,7 +1461,7 @@ static void gen6_ggtt_insert_entries(struct i915_address_space *vm, (gen6_gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry; int i = 0; struct sg_page_iter sg_iter; - dma_addr_t addr; + dma_addr_t addr = 0; for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) { addr = sg_page_iter_dma_address(&sg_iter); @@ -1475,9 +1475,10 @@ static void gen6_ggtt_insert_entries(struct i915_address_space *vm, * of NUMA access patterns. Therefore, even with the way we assume * hardware should work, we must keep this posting read for paranoia. */ - if (i != 0) - WARN_ON(readl(>t_entries[i-1]) != - vm->pte_encode(addr, level, true, flags)); + if (i != 0) { + unsigned long gtt = readl(>t_entries[i-1]); + WARN_ON(gtt != vm->pte_encode(addr, level, true, flags)); + } /* This next bit makes the above posting read even more important. We * want to flush the TLBs only after we're certain all the PTE updates |