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| author | Mike Travis <travis@sgi.com> | 2008-12-17 02:34:05 +0100 |
|---|---|---|
| committer | Mike Travis <travis@sgi.com> | 2008-12-17 02:40:59 +0100 |
| commit | e4d98207ea3f3d15eb664282df16d18c4ac86f80 (patch) | |
| tree | c0534e71940014158123a320ea0d65d6810e1818 /arch/x86/xen | |
| parent | x86: use work_on_cpu in x86/kernel/cpu/mcheck/mce_amd_64.c (diff) | |
| download | linux-e4d98207ea3f3d15eb664282df16d18c4ac86f80.tar.xz linux-e4d98207ea3f3d15eb664282df16d18c4ac86f80.zip | |
x86: xen: use smp_call_function_many()
Impact: use new API, remove cpumask from stack.
Change smp_call_function_mask() callers to smp_call_function_many().
This removes a cpumask from the stack, and falls back should allocating
the cpumask var fail (only possible with CONFIG_CPUMASKS_OFFSTACK).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Mike Travis <travis@sgi.com>
Cc: jeremy@xensource.com
Diffstat (limited to 'arch/x86/xen')
| -rw-r--r-- | arch/x86/xen/mmu.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index 636ef4caa52d..e59e53b11e2b 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -1079,7 +1079,7 @@ static void drop_other_mm_ref(void *info) static void xen_drop_mm_ref(struct mm_struct *mm) { - cpumask_t mask; + cpumask_var_t mask; unsigned cpu; if (current->active_mm == mm) { @@ -1091,7 +1091,16 @@ static void xen_drop_mm_ref(struct mm_struct *mm) } /* Get the "official" set of cpus referring to our pagetable. */ - mask = mm->cpu_vm_mask; + if (!alloc_cpumask_var(&mask, GFP_ATOMIC)) { + for_each_online_cpu(cpu) { + if (!cpumask_test_cpu(cpu, &mm->cpu_vm_mask) + && per_cpu(xen_current_cr3, cpu) != __pa(mm->pgd)) + continue; + smp_call_function_single(cpu, drop_other_mm_ref, mm, 1); + } + return; + } + cpumask_copy(mask, &mm->cpu_vm_mask); /* It's possible that a vcpu may have a stale reference to our cr3, because its in lazy mode, and it hasn't yet flushed @@ -1100,11 +1109,12 @@ static void xen_drop_mm_ref(struct mm_struct *mm) if needed. */ for_each_online_cpu(cpu) { if (per_cpu(xen_current_cr3, cpu) == __pa(mm->pgd)) - cpu_set(cpu, mask); + cpumask_set_cpu(cpu, mask); } - if (!cpus_empty(mask)) - smp_call_function_mask(mask, drop_other_mm_ref, mm, 1); + if (!cpumask_empty(mask)) + smp_call_function_many(mask, drop_other_mm_ref, mm, 1); + free_cpumask_var(mask); } #else static void xen_drop_mm_ref(struct mm_struct *mm) |