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| author | Ard Biesheuvel <ardb@kernel.org> | 2023-01-02 11:18:46 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2023-01-13 12:11:18 +0800 |
| commit | ebd19e0c70fe0e05794f1f15a7c69b9492cb56f1 (patch) | |
| tree | 910ba17463abe8c7332fff5a801583c97a0e10b5 /crypto | |
| parent | d8e6eb21f7af62608dcd5cdede8dd2d7ce9a60c1 (diff) | |
| download | linux-crypto-ebd19e0c70fe0e05794f1f15a7c69b9492cb56f1.tar.gz linux-crypto-ebd19e0c70fe0e05794f1f15a7c69b9492cb56f1.zip | |
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 <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to '')
| -rw-r--r-- | crypto/skcipher.c | 22 |
1 files 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) |