From ebd19e0c70fe0e05794f1f15a7c69b9492cb56f1 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Mon, 2 Jan 2023 11:18:46 +0100 Subject: crypto: skcipher - Use scatterwalk (un)map interface for dst and src buffers The skcipher walk API implementation avoids scatterwalk_map() for mapping the source and destination buffers, and invokes kmap_atomic() directly if the buffer in question is not in low memory (which can only happen on 32-bit architectures). This avoids some overhead on 64-bit architectures, and most notably, permits the skcipher code to run with preemption enabled. Now that scatterwalk_map() has been updated to use kmap_local(), none of this is needed, so we can simply use scatterwalk_map/unmap instead. Signed-off-by: Ard Biesheuvel Signed-off-by: Herbert Xu --- crypto/skcipher.c | 22 ++++------------------ 1 file changed, 4 insertions(+), 18 deletions(-) diff --git a/crypto/skcipher.c b/crypto/skcipher.c index 0ecab31c..7bf4871f 100644 --- a/crypto/skcipher.c +++ b/crypto/skcipher.c @@ -42,38 +42,24 @@ struct skcipher_walk_buffer { static int skcipher_walk_next(struct skcipher_walk *walk); -static inline void skcipher_unmap(struct scatter_walk *walk, void *vaddr) -{ - if (PageHighMem(scatterwalk_page(walk))) - kunmap_atomic(vaddr); -} - -static inline void *skcipher_map(struct scatter_walk *walk) -{ - struct page *page = scatterwalk_page(walk); - - return (PageHighMem(page) ? kmap_atomic(page) : page_address(page)) + - offset_in_page(walk->offset); -} - static inline void skcipher_map_src(struct skcipher_walk *walk) { - walk->src.virt.addr = skcipher_map(&walk->in); + walk->src.virt.addr = scatterwalk_map(&walk->in); } static inline void skcipher_map_dst(struct skcipher_walk *walk) { - walk->dst.virt.addr = skcipher_map(&walk->out); + walk->dst.virt.addr = scatterwalk_map(&walk->out); } static inline void skcipher_unmap_src(struct skcipher_walk *walk) { - skcipher_unmap(&walk->in, walk->src.virt.addr); + scatterwalk_unmap(walk->src.virt.addr); } static inline void skcipher_unmap_dst(struct skcipher_walk *walk) { - skcipher_unmap(&walk->out, walk->dst.virt.addr); + scatterwalk_unmap(walk->dst.virt.addr); } static inline gfp_t skcipher_walk_gfp(struct skcipher_walk *walk) -- cgit v1.2.3