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@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx
Signed-off-by: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: <ofir.drang@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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);
-
while ((offset < buflen) && sg_miter_next(&miter)) {
unsigned int len;
@@ -695,7 +692,6 @@ size_t sg_copy_buffer(struct scatterlist
sg_miter_stop(&miter);
- local_irq_restore(flags);
return offset;
}
EXPORT_SYMBOL(sg_copy_buffer);
_
Patches currently in -mm which might be from gilad@xxxxxxxxxxxxx are
scatterlist-reorder-compound-boolean-expression.patch
scatterlist-do-not-disable-irqs-in-sg_copy_buffer.patch
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