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Date: Thu, 17 Jan 2008 18:52:03 -0500 From: Kyle McMartin <kyle@...artin.ca> To: akpm@...ux-foundation.org Cc: airlied@...ux.ie, linux-kernel@...r.kernel.org Subject: [mm patch] i915: fix invalid opcode exception on cpus without clflush i915_flush_ttm was unconditionally executing a clflush instruction to (obviously) flush the cache. Instead, check if the cpu supports clflush, and if not, fall back to calling wbinvd to flush the entire cache. Signed-off-by: Kyle McMartin <kmcmartin@...hat.com> --- a/drivers/char/drm/i915_buffer.c +++ b/drivers/char/drm/i915_buffer.c @@ -286,7 +286,18 @@ void i915_flush_ttm(struct drm_ttm *ttm) return; DRM_MEMORYBARRIER(); + +#ifdef CONFIG_X86_32 + /* Hopefully nobody has built an x86-64 processor without clflush */ + if (!cpu_has_clflush) { + wbinvd(); + DRM_MEMORYBARRIER(); + return; + } +#endif + for (i = ttm->num_pages - 1; i >= 0; i--) drm_cache_flush_page(drm_ttm_get_page(ttm, i)); + DRM_MEMORYBARRIER(); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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