Simplify the kernel pmap locking in pmap_enter_pv(). While I'm here, tidy
up the comments and whitespace. Tested by: cognet
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0b35b54b4d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=240442
@ -1588,11 +1588,11 @@ pmap_clearbit(struct vm_page *pg, u_int maskbits)
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*/
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/*
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* pmap_enter_pv: enter a mapping onto a vm_page lst
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* pmap_enter_pv: enter a mapping onto a vm_page's PV list
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*
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* => caller should hold the proper lock on pvh_global_lock
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* => caller should have pmap locked
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* => we will gain the lock on the vm_page and allocate the new pv_entry
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* => we will (someday) gain the lock on the vm_page's PV list
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* => caller should adjust ptp's wire_count before calling
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* => caller should not adjust pmap's wire_count
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*/
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@ -1600,33 +1600,26 @@ static void
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pmap_enter_pv(struct vm_page *pg, struct pv_entry *pve, pmap_t pm,
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vm_offset_t va, u_int flags)
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{
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int km;
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rw_assert(&pvh_global_lock, RA_WLOCKED);
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PMAP_ASSERT_LOCKED(pm);
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if (pg->md.pv_kva != 0) {
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/* PMAP_ASSERT_LOCKED(pmap_kernel()); */
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pve->pv_pmap = pmap_kernel();
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pve->pv_pmap = kernel_pmap;
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pve->pv_va = pg->md.pv_kva;
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pve->pv_flags = PVF_WRITE | PVF_UNMAN;
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pg->md.pv_kva = 0;
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if (!(km = PMAP_OWNED(pmap_kernel())))
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PMAP_LOCK(pmap_kernel());
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if (pm != kernel_pmap)
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PMAP_LOCK(kernel_pmap);
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TAILQ_INSERT_HEAD(&pg->md.pv_list, pve, pv_list);
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TAILQ_INSERT_HEAD(&pve->pv_pmap->pm_pvlist, pve, pv_plist);
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PMAP_UNLOCK(pmap_kernel());
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TAILQ_INSERT_HEAD(&kernel_pmap->pm_pvlist, pve, pv_plist);
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if (pm != kernel_pmap)
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PMAP_UNLOCK(kernel_pmap);
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pg->md.pv_kva = 0;
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if ((pve = pmap_get_pv_entry()) == NULL)
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panic("pmap_kenter_pv: no pv entries");
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if (km)
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PMAP_LOCK(pmap_kernel());
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}
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PMAP_ASSERT_LOCKED(pm);
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pve->pv_pmap = pm;
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pve->pv_va = va;
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pve->pv_flags = flags;
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TAILQ_INSERT_HEAD(&pg->md.pv_list, pve, pv_list);
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TAILQ_INSERT_HEAD(&pm->pm_pvlist, pve, pv_plist);
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pg->md.pvh_attrs |= flags & (PVF_REF | PVF_MOD);
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