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[SPARC64] mm: Do not flush TLB mm in tlb_finish_mmu()

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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>
This commit is contained in:
David S. Miller 2005-11-07 14:09:58 -08:00
parent 4c85ce522f
commit 62dbec78be
2 changed files with 21 additions and 37 deletions
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52
arch/sparc64/kernel/smp.c
View file

@ -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;
}
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);
put_cpu();
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);
local_flush_and_out:
__flush_tlb_mm(ctx, SECONDARY_CONTEXT);
put_cpu();
}
void smp_flush_tlb_pending(struct mm_struct *mm, unsigned long nr, unsigned long *vaddrs)

6
include/asm-sparc64/tlb.h
View file

@ -78,11 +78,9 @@ static inline void tlb_finish_mmu(struct mmu_gather *mp, unsigned long start, un
{
tlb_flush_mmu(mp);
if (mp->fullmm) {
if (CTX_VALID(mp->mm->context))
do_flush_tlb_mm(mp->mm);
if (mp->fullmm)
mp->fullmm = 0;
} else
else
flush_tlb_pending();
/* keep the page table cache within bounds */