50 lines
1.5 KiB
Diff
50 lines
1.5 KiB
Diff
|
From e11b70d460260fac71ce7efc575fa72df5579bcb Mon Sep 17 00:00:00 2001
|
||
|
|
From: Thomas Gleixner <tglx@linutronix.de>
|
||
|
|
Date: Fri, 3 Jul 2009 08:44:34 -0500
|
||
|
|
Subject: [PATCH 086/365] mm/scatterlist: Do not disable irqs on RT
|
||
|
|
|
||
|
|
The local_irq_save() is not only used to get things done "fast" but
|
||
|
|
also to ensure that in case of SG_MITER_ATOMIC we are in "atomic"
|
||
|
|
context for kmap_atomic(). For -RT it is enough to keep pagefault
|
||
|
|
disabled (which is currently handled by kmap_atomic()).
|
||
|
|
|
||
|
|
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
|
||
|
|
---
|
||
|
|
lib/scatterlist.c | 6 +++---
|
||
|
|
1 file changed, 3 insertions(+), 3 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
|
||
|
|
index 00e02ebb3666..4608b8e0891f 100644
|
||
|
|
--- a/lib/scatterlist.c
|
||
|
|
+++ b/lib/scatterlist.c
|
||
|
|
@@ -630,7 +630,7 @@ void sg_miter_stop(struct sg_mapping_iter *miter)
|
||
|
|
flush_kernel_dcache_page(miter->page);
|
||
|
|
|
||
|
|
if (miter->__flags & SG_MITER_ATOMIC) {
|
||
|
|
- WARN_ON_ONCE(preemptible());
|
||
|
|
+ WARN_ON_ONCE(!pagefault_disabled());
|
||
|
|
kunmap_atomic(miter->addr);
|
||
|
|
} else
|
||
|
|
kunmap(miter->page);
|
||
|
|
@@ -674,7 +674,7 @@ size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf,
|
||
|
|
if (!sg_miter_skip(&miter, skip))
|
||
|
|
return false;
|
||
|
|
|
||
|
|
- local_irq_save(flags);
|
||
|
|
+ local_irq_save_nort(flags);
|
||
|
|
|
||
|
|
while (sg_miter_next(&miter) && offset < buflen) {
|
||
|
|
unsigned int len;
|
||
|
|
@@ -691,7 +691,7 @@ size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf,
|
||
|
|
|
||
|
|
sg_miter_stop(&miter);
|
||
|
|
|
||
|
|
- local_irq_restore(flags);
|
||
|
|
+ local_irq_restore_nort(flags);
|
||
|
|
return offset;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(sg_copy_buffer);
|
||
|
|
--
|
||
|
|
2.28.0
|
||
|
|
|