From: Chris Wilson Date: Wed, 13 Sep 2017 10:57:54 +0000 (+0100) Subject: drm/i915: Squelch smatch warning for statement with no effect X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=e60b36f76c2ee0ba90b431daa534bc262798fb26;p=openwrt%2Fstaging%2Fblogic.git drm/i915: Squelch smatch warning for statement with no effect 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 Reviewed-by: Jani Nikula Link: https://patchwork.freedesktop.org/patch/msgid/20170913105754.4423-1-chris@chris-wilson.co.uk --- diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index ec70121410e4..9dba1b2e8019 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -2835,8 +2835,8 @@ 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 @@ -2848,8 +2848,8 @@ 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 unsigned int i915_sg_segment_size(void) {