We actually use dev_addr[26:13] as the index into dma_entry_hash. Given that the code itself is clear enough, let's drop the hardcoded comment so that we won't need to revisit it every time HASH_FN_{SHIFT,MASK} gets updated.
Signed-off-by: Zenghui Yu <yuzeng...@huawei.com> --- kernel/dma/debug.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c index 14de1271463f..d89341162d35 100644 --- a/kernel/dma/debug.c +++ b/kernel/dma/debug.c @@ -235,10 +235,7 @@ static bool driver_filter(struct device *dev) */ static int hash_fn(struct dma_debug_entry *entry) { - /* - * Hash function is based on the dma address. - * We use bits 20-27 here as the index into the hash - */ + /* Hash function is based on the dma address. */ return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK; } -- 2.19.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu