Re: [4.4-rt2 PATCH] ARM: highmem: take into account FIX_KMAP_BEGIN in switch_kmaps()

From: Grygorii Strashko
Date: Wed Jan 20 2016 - 15:36:12 EST


On 01/20/2016 10:23 PM, Russell King - ARM Linux wrote:
On Wed, Jan 20, 2016 at 09:21:39PM +0100, Sebastian Andrzej Siewior wrote:
* Grygorii Strashko | 2016-01-15 16:20:47 [+0200]:

--- a/arch/arm/mm/highmem.c
+++ b/arch/arm/mm/highmem.c
@@ -175,7 +180,7 @@ void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p)
* Restore @next_p's kmap_atomic mappings
*/
for (i = 0; i < next_p->kmap_idx; i++) {
- int idx = i + KM_TYPE_NR * smp_processor_id();
+ int idx = fixmap_idx(i);

if (!pte_none(next_p->kmap_pte[i]))
set_fixmap_pte(idx, next_p->kmap_pte[i]);

Grygorii, if you remove this chunk then it should apply upstream. Could
you forward it upstream then please? So the -RT piece would shrink a
little:)

Or I could commit my own patch which forms a proportion of this change.


np from my side.

--
regards,
-grygorii