From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Thu, 3 Nov 2005 20:32:45 +0000 (+0000)
Subject: [ARM SMP] Do not clear cpu_vm_mask for VIPT caches
X-Git-Tag: firefly_0821_release~40169^2~29^2~8^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7e5e6e9a509c4ed2973a345ec7ffb96577f42e26;p=firefly-linux-kernel-4.4.55.git

[ARM SMP] Do not clear cpu_vm_mask for VIPT caches

Since we do not invalidate TLBs/caches on MM switches, we should not
clear the cpu_vm_mask for the CPU.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/include/asm-arm/mmu_context.h b/include/asm-arm/mmu_context.h
index 4af9c411c617..57b8def83d41 100644
--- a/include/asm-arm/mmu_context.h
+++ b/include/asm-arm/mmu_context.h
@@ -86,7 +86,8 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
 		cpu_set(cpu, next->cpu_vm_mask);
 		check_context(next);
 		cpu_switch_mm(next->pgd, next);
-		cpu_clear(cpu, prev->cpu_vm_mask);
+		if (cache_is_vivt())
+			cpu_clear(cpu, prev->cpu_vm_mask);
 	}
 }