+ scatterlist-do-not-disable-irqs-in-sg_copy_buffer.patch added to -mm tree

+ scatterlist-do-not-disable-irqs-in-sg_copy_buffer.patch added to -mm tree

[akpm]

The patch titled
     Subject: scatterlist: do not disable IRQs in sg_copy_buffer
has been added to the -mm tree.  Its filename is
     scatterlist-do-not-disable-irqs-in-sg_copy_buffer.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/scatterlist-do-not-disable-irqs-in-sg_copy_buffer.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/scatterlist-do-not-disable-irqs-in-sg_copy_buffer.patch

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------------------------------------------------------
From: Gilad Ben-Yossef <gilad@benyossef.com>
Subject: scatterlist: do not disable IRQs in sg_copy_buffer

Commit 50bed2e2862a ("sg: disable interrupts inside sg_copy_buffer")
introduced disabling interrupts in sg_copy_buffer() since atomic uses of
miter required it due to use of kmap_atomic().

However, as commit 8290e2d2dcbf ("scatterlist: atomic sg_mapping_iter() no
longer needs disabled IRQs") acknowledges disabling interrupts is no
longer needed for calls to kmap_atomic() and therefore unneeded for miter
ops either, so remove it from sg_copy_buffer().

Link: http://lkml.kernel.org/r/1486040150-14109-3-git-send-email-gilad@benyossef.com
Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: <ofir.drang@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/scatterlist.c |    4 ----
 1 file changed, 4 deletions(-)

diff -puN lib/scatterlist.c~scatterlist-do-not-disable-irqs-in-sg_copy_buffer lib/scatterlist.c
--- a/lib/scatterlist.c~scatterlist-do-not-disable-irqs-in-sg_copy_buffer
+++ a/lib/scatterlist.c
@@ -665,7 +665,6 @@ size_t sg_copy_buffer(struct scatterlist
 {
 	unsigned int offset = 0;
 	struct sg_mapping_iter miter;
-	unsigned long flags;
 	unsigned int sg_flags = SG_MITER_ATOMIC;
 
 	if (to_buffer)
@@ -678,8 +677,6 @@ size_t sg_copy_buffer(struct scatterlist
 	if (!sg_miter_skip(&miter, skip))
 		return false;
 
-	local_irq_save(flags);