[PATCH 1/2] drm/i915: Squelch smatch warning for statement with no effect

Chris Wilson
2017-01-20T21:45:34Z

The sgt iterators cause an

drivers/gpu/drm/i915/i915_gpu_error.c:846 i915_error_object_create() warn: statement has no effect 7

everywhere they are used. If we change the code slightly, we can achieve
the same increment without altering the output or raising a warning.

text data bss dec hex filename
1267906 20587 3168 1291661 13b58d before
1267906 20587 3168 1291661 13b58d after

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_drv.h | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 1b340eb0db19..ebe2f6c737f7 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2620,8 +2620,8 @@ static inline struct scatterlist *__sg_next(struct scatterlist *sg)
#define for_each_sgt_dma(__dmap, __iter, __sgt) \
for ((__iter) = __sgt_iter((__sgt)->sgl, true); \
((__dmap) = (__iter).dma + (__iter).curr); \
- (((__iter).curr += PAGE_SIZE) < (__iter).max) || \
- ((__iter) = __sgt_iter(__sg_next((__iter).sgp), true), 0))
+ (((__iter).curr += PAGE_SIZE) >= (__iter).max) ? \
+ (__iter) = __sgt_iter(__sg_next((__iter).sgp), true), 0 : 0)

/**
* for_each_sgt_page - iterate over the pages of the given sg_table
@@ -2633,8 +2633,8 @@ static inline struct scatterlist *__sg_next(struct scatterlist *sg)
for ((__iter) = __sgt_iter((__sgt)->sgl, false); \
((__pp) = (__iter).pfn == 0 ? NULL : \
pfn_to_page((__iter).pfn + ((__iter).curr >> PAGE_SHIFT))); \
- (((__iter).curr += PAGE_SIZE) < (__iter).max) || \
- ((__iter) = __sgt_iter(__sg_next((__iter).sgp), false), 0))
+ (((__iter).curr += PAGE_SIZE) >= (__iter).max) ? \
+ (__iter) = __sgt_iter(__sg_next((__iter).sgp), false), 0 : 0)

static inline const struct intel_device_info *
intel_info(const struct drm_i915_private *dev_priv)
--
2.11.0