From: Sumitra Sharma Date: Sat, 17 Jun 2023 18:04:20 +0000 (-0700) Subject: drm/i915: Replace kmap() with kmap_local_page() X-Git-Tag: v6.6-rc1~1^2~16^2~39 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=36dd2a6e5003a215a1d45e41589164dabae0ec5a;p=linux-block.git drm/i915: Replace kmap() with kmap_local_page() kmap() has been deprecated in favor of the kmap_local_page() due to high cost, restricted mapping space, the overhead of a global lock for synchronization, and making the process sleep in the absence of free slots. kmap_local_page() is faster than kmap() and offers thread-local and CPU-local mappings, can take pagefaults in a local kmap region and preserves preemption by saving the mappings of outgoing tasks and restoring those of the incoming one during a context switch. The mapping is kept thread local in the function “i915_vma_coredump_create” in i915_gpu_error.c Therefore, replace kmap() with kmap_local_page(). Suggested-by: Ira Weiny Signed-off-by: Sumitra Sharma Reviewed-by: Thomas Hellström Reviewed-by: Fabio M. De Francesco Signed-off-by: Tvrtko Ursulin Link: https://patchwork.freedesktop.org/patch/msgid/20230617180420.GA410966@sumitra.com [tursulin: Removed blank line within tags. Fixup commit text.] --- diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c index ec368e700235..4749f99e6320 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -1173,9 +1173,9 @@ i915_vma_coredump_create(const struct intel_gt *gt, drm_clflush_pages(&page, 1); - s = kmap(page); + s = kmap_local_page(page); ret = compress_page(compress, s, dst, false); - kunmap(page); + kunmap_local(s); drm_clflush_pages(&page, 1);