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Subject[RFC PATCH 3/6] ARM: Allow ASID 0 to be allocated to tasks
Date
From: Will Deacon <will.deacon@arm.com>

Now that ASID 0 is no longer used as a reserved value, allow it to be
allocated to tasks.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Russell King <linux@arm.linux.org.uk>
---
arch/arm/mm/context.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/arm/mm/context.c b/arch/arm/mm/context.c
index a062230..1d5014b 100644
--- a/arch/arm/mm/context.c
+++ b/arch/arm/mm/context.c
@@ -100,7 +100,7 @@ static void reset_context(void *info)
return;

smp_rmb();
- asid = cpu_last_asid + cpu + 1;
+ asid = cpu_last_asid + cpu;

flush_context();
set_mm_context(mm, asid);
@@ -149,13 +149,13 @@ void __new_context(struct mm_struct *mm)
* to start a new version and flush the TLB.
*/
if (unlikely((asid & ~ASID_MASK) == 0)) {
- asid = cpu_last_asid + smp_processor_id() + 1;
+ asid = cpu_last_asid + smp_processor_id();
flush_context();
#ifdef CONFIG_SMP
smp_wmb();
smp_call_function(reset_context, NULL, 1);
#endif
- cpu_last_asid += NR_CPUS;
+ cpu_last_asid += NR_CPUS - 1;
}

set_mm_context(mm, asid);


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