On Wed, Jan 20, 2016 at 09:21:39PM +0100, Sebastian Andrzej Siewior wrote:

* Grygorii Strashko | 2016-01-15 16:20:47 [+0200]:

quoted

--- 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.

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