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Subject: mm: rt: Fix generic kmap_atomic for RT
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sat, 19 Sep 2015 10:15:00 +0200
The update to 4.1 brought in the mainline variant of the pagefault
disable distangling from preempt count. That introduced a
preempt_disable/enable pair in the generic kmap_atomic/kunmap_atomic
implementations which got not converted to the _nort() variant.
That results in massive 'scheduling while atomic/sleeping function
called from invalid context' splats.
Fix that up.
Reported-and-tested-by: Juergen Borleis <jbe@pengutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/highmem.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -65,7 +65,7 @@ static inline void kunmap(struct page *p
static inline void *kmap_atomic(struct page *page)
{
- preempt_disable();
+ preempt_disable_nort();
pagefault_disable();
return page_address(page);
}
@@ -74,7 +74,7 @@ static inline void *kmap_atomic(struct p
static inline void __kunmap_atomic(void *addr)
{
pagefault_enable();
- preempt_enable();
+ preempt_enable_nort();
}
#define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn))
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