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Eliminate an unnecessary acquisition and release of the page queues lock

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from pmap_pte().  PT_SET_MA() is not a queued mapping update, but instead
an immediate mapping update, so the page queues lock is not required here.

Reviewed by:	cperciva
This commit is contained in:
Alan Cox 2012-08-10 05:47:04 +00:00
parent c0c5f0df71
commit bab30462fb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=239171
1 changed files with 0 additions and 2 deletions
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sys/i386/xen/pmap.c
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@ -965,9 +965,7 @@ pmap_pte(pmap_t pmap, vm_offset_t va)
mtx_lock(&PMAP2mutex);
newpf = *pde & PG_FRAME;
if ((*PMAP2 & PG_FRAME) != newpf) {
vm_page_lock_queues();
PT_SET_MA(PADDR2, newpf | PG_V | PG_A | PG_M);
vm_page_unlock_queues();
CTR3(KTR_PMAP, "pmap_pte: pmap=%p va=0x%x newpte=0x%08x",
pmap, va, (*PMAP2 & 0xffffffff));
}