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>
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index 004fc70..ccc4699 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -620,7 +620,7 @@
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);
@@ -664,7 +664,7 @@
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;
@@ -681,7 +681,7 @@
sg_miter_stop(&miter);
- local_irq_restore(flags);
+ local_irq_restore_nort(flags);
return offset;
}
EXPORT_SYMBOL(sg_copy_buffer);