diff options
| author | Ingo Molnar <mingo@elte.hu> | 2011-06-04 12:13:06 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-06-04 12:13:06 +0200 |
| commit | 710054ba25c0d1f8f41c22ce13ba336503fb5318 (patch) | |
| tree | f9b09b722bf511841539173d946f90a20fc2e59a /arch/arm/mm/context.c | |
| parent | 74c355fbdfedd3820046dba4f537876cea54c207 (diff) | |
| parent | b273fa9716aa1564bee88ceee62f9042981cdc81 (diff) | |
Merge branch 'perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent
Diffstat (limited to 'arch/arm/mm/context.c')
| -rw-r--r-- | arch/arm/mm/context.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/arch/arm/mm/context.c b/arch/arm/mm/context.c index b0ee9ba3cfa..8bfae964b13 100644 --- a/arch/arm/mm/context.c +++ b/arch/arm/mm/context.c @@ -24,9 +24,7 @@ DEFINE_PER_CPU(struct mm_struct *, current_mm); /* * We fork()ed a process, and we need a new context for the child - * to run in. We reserve version 0 for initial tasks so we will - * always allocate an ASID. The ASID 0 is reserved for the TTBR - * register changing sequence. + * to run in. */ void __init_new_context(struct task_struct *tsk, struct mm_struct *mm) { @@ -36,8 +34,11 @@ void __init_new_context(struct task_struct *tsk, struct mm_struct *mm) static void flush_context(void) { - /* set the reserved ASID before flushing the TLB */ - asm("mcr p15, 0, %0, c13, c0, 1\n" : : "r" (0)); + u32 ttb; + /* Copy TTBR1 into TTBR0 */ + asm volatile("mrc p15, 0, %0, c2, c0, 1\n" + "mcr p15, 0, %0, c2, c0, 0" + : "=r" (ttb)); isb(); local_flush_tlb_all(); if (icache_is_vivt_asid_tagged()) { @@ -93,7 +94,7 @@ 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); @@ -143,13 +144,13 @@ 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); |