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authorDavid S. Miller <davem@davemloft.net>2005-11-07 14:09:58 -0800
committerDavid S. Miller <davem@davemloft.net>2005-11-07 14:09:58 -0800
commit62dbec78be652c28f63ad5eda3d01c244c916040 (patch)
tree2f1e77d3f3a645dd4bfc36ef80bb60a9a2161ad8 /arch
parent4c85ce522fc4bf1b8fcd6255fadc11cfb75773df (diff)
[SPARC64] mm: Do not flush TLB mm in tlb_finish_mmu()
It isn't needed any longer, as noted by Hugh Dickins. We still need the flush routines, due to the one remaining call site in hugetlb_prefault_arch_hook(). That can be eliminated at some later point, however. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
-rw-r--r--arch/sparc64/kernel/smp.c48
1 files changed, 17 insertions, 31 deletions
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index a9089e2140e..5d90ee9aebf 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -839,43 +839,29 @@ void smp_flush_tlb_all(void)
* questionable (in theory the big win for threads is the massive sharing of
* address space state across processors).
*/
+
+/* This currently is only used by the hugetlb arch pre-fault
+ * hook on UltraSPARC-III+ and later when changing the pagesize
+ * bits of the context register for an address space.
+ */
void smp_flush_tlb_mm(struct mm_struct *mm)
{
- /*
- * This code is called from two places, dup_mmap and exit_mmap. In the
- * former case, we really need a flush. In the later case, the callers
- * are single threaded exec_mmap (really need a flush), multithreaded
- * exec_mmap case (do not need to flush, since the caller gets a new
- * context via activate_mm), and all other callers of mmput() whence
- * the flush can be optimized since the associated threads are dead and
- * the mm is being torn down (__exit_mm and other mmput callers) or the
- * owning thread is dissociating itself from the mm. The
- * (atomic_read(&mm->mm_users) == 0) check ensures real work is done
- * for single thread exec and dup_mmap cases. An alternate check might
- * have been (current->mm != mm).
- * Kanoj Sarcar
- */
- if (atomic_read(&mm->mm_users) == 0)
- return;
-
- {
- u32 ctx = CTX_HWBITS(mm->context);
- int cpu = get_cpu();
+ u32 ctx = CTX_HWBITS(mm->context);
+ int cpu = get_cpu();
- if (atomic_read(&mm->mm_users) == 1) {
- mm->cpu_vm_mask = cpumask_of_cpu(cpu);
- goto local_flush_and_out;
- }
+ if (atomic_read(&mm->mm_users) == 1) {
+ mm->cpu_vm_mask = cpumask_of_cpu(cpu);
+ goto local_flush_and_out;
+ }
- smp_cross_call_masked(&xcall_flush_tlb_mm,
- ctx, 0, 0,
- mm->cpu_vm_mask);
+ smp_cross_call_masked(&xcall_flush_tlb_mm,
+ ctx, 0, 0,
+ mm->cpu_vm_mask);
- local_flush_and_out:
- __flush_tlb_mm(ctx, SECONDARY_CONTEXT);
+local_flush_and_out:
+ __flush_tlb_mm(ctx, SECONDARY_CONTEXT);
- put_cpu();
- }
+ put_cpu();
}
void smp_flush_tlb_pending(struct mm_struct *mm, unsigned long nr, unsigned long *vaddrs)