From e09b41010ba33a20a87472ee821fa407a5b8da36 Mon Sep 17 00:00:00 2001 From: José Pekkarinen Date: Mon, 11 Apr 2016 10:41:07 +0300 Subject: These changes are the raw update to linux-4.4.6-rt14. Kernel sources are taken from kernel.org, and rt patch from the rt wiki download page. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen --- kernel/crypto/scatterwalk.c | 45 ++++++++++++++++++++++++++++++++++----------- 1 file changed, 34 insertions(+), 11 deletions(-) (limited to 'kernel/crypto/scatterwalk.c') diff --git a/kernel/crypto/scatterwalk.c b/kernel/crypto/scatterwalk.c index 3bd749c7b..ea5815c5e 100644 --- a/kernel/crypto/scatterwalk.c +++ b/kernel/crypto/scatterwalk.c @@ -54,7 +54,11 @@ static void scatterwalk_pagedone(struct scatter_walk *walk, int out, struct page *page; page = sg_page(walk->sg) + ((walk->offset - 1) >> PAGE_SHIFT); - if (!PageSlab(page)) + /* Test ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE first as + * PageSlab cannot be optimised away per se due to + * use of volatile pointer. + */ + if (ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE && !PageSlab(page)) flush_dcache_page(page); } @@ -104,22 +108,18 @@ void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg, unsigned int start, unsigned int nbytes, int out) { struct scatter_walk walk; - unsigned int offset = 0; + struct scatterlist tmp[2]; if (!nbytes) return; - for (;;) { - scatterwalk_start(&walk, sg); - - if (start < offset + sg->length) - break; + sg = scatterwalk_ffwd(tmp, sg, start); - offset += sg->length; - sg = sg_next(sg); - } + if (sg_page(sg) == virt_to_page(buf) && + sg->offset == offset_in_page(buf)) + return; - scatterwalk_advance(&walk, start - offset); + scatterwalk_start(&walk, sg); scatterwalk_copychunks(buf, &walk, nbytes, out); scatterwalk_done(&walk, out, 0); } @@ -146,3 +146,26 @@ int scatterwalk_bytes_sglen(struct scatterlist *sg, int num_bytes) return n; } EXPORT_SYMBOL_GPL(scatterwalk_bytes_sglen); + +struct scatterlist *scatterwalk_ffwd(struct scatterlist dst[2], + struct scatterlist *src, + unsigned int len) +{ + for (;;) { + if (!len) + return src; + + if (src->length > len) + break; + + len -= src->length; + src = sg_next(src); + } + + sg_init_table(dst, 2); + sg_set_page(dst, sg_page(src), src->length - len, src->offset + len); + scatterwalk_crypto_chain(dst, sg_next(src), 0, 2); + + return dst; +} +EXPORT_SYMBOL_GPL(scatterwalk_ffwd); -- cgit 1.2.3-korg