diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2011-07-28 08:43:51 (GMT) |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2014-04-10 00:19:53 (GMT) |
| commit | 24a92055470f7d51209baa08bc015564438d0e8a (patch) | |
| tree | ba50dfbb23c0c5633e27e7f42d729634550cf3c2 /mm/memory.c | |
| parent | 29b03268a7cca25fc60f2b5ec62c85f426f48257 (diff) | |
| download | linux-fsl-qoriq-24a92055470f7d51209baa08bc015564438d0e8a.tar.xz | |
mm, rt: kmap_atomic scheduling
In fact, with migrate_disable() existing one could play games with
kmap_atomic. You could save/restore the kmap_atomic slots on context
switch (if there are any in use of course), this should be esp easy now
that we have a kmap_atomic stack.
Something like the below.. it wants replacing all the preempt_disable()
stuff with pagefault_disable() && migrate_disable() of course, but then
you can flip kmaps around like below.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
[dvhart@linux.intel.com: build fix]
Link: http://lkml.kernel.org/r/1311842631.5890.208.camel@twins
[tglx@linutronix.de: Get rid of the per cpu variable and store the idx
and the pte content right away in the task struct.
Shortens the context switch code. ]
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index 5771e09..0dcdc84 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3745,6 +3745,7 @@ unlock: #ifdef CONFIG_PREEMPT_RT_FULL void pagefault_disable(void) { + migrate_disable(); current->pagefault_disabled++; /* * make sure to have issued the store before a pagefault @@ -3762,6 +3763,7 @@ void pagefault_enable(void) */ barrier(); current->pagefault_disabled--; + migrate_enable(); } EXPORT_SYMBOL(pagefault_enable); #endif |