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dma-mapping: Clarify valid conditions for CPU cache line overlap

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Rename the DMA_ATTR_CPU_CACHE_CLEAN attribute to better reflect that it
is debugging aid to inform DMA core code that CPU cache line overlaps are
allowed, and refine the documentation describing its use.

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20260316-dma-debug-overlap-v3-3-1dde90a7f08b@nvidia.com
This commit is contained in:
Leon Romanovsky
2026-03-16 21:06:47 +02:00
committed by Marek Szyprowski
parent 6f45b1604c
commit 9bb0a4d6a4
5 changed files with 24 additions and 18 deletions
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2
kernel/dma/debug.c
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@@ -601,7 +601,7 @@ static void add_dma_entry(struct dma_debug_entry *entry, unsigned long attrs)
unsigned long flags;
int rc;
entry->is_cache_clean = !!(attrs & DMA_ATTR_CPU_CACHE_CLEAN);
entry->is_cache_clean = attrs & DMA_ATTR_DEBUGGING_IGNORE_CACHELINES;
bucket = get_hash_bucket(entry, &flags);
hash_bucket_add(bucket, entry);