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Note a kernel pmap locking problem in pmap_kenter_pa4m().

This commit is contained in:
pk 2003-03-03 22:43:58 +00:00
parent 31bc31ea63
commit f26c7b7e7f
1 changed files with 9 additions and 1 deletions
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10
sys/arch/sparc/sparc/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.248 2003/03/02 21:37:21 pk Exp $ */ /* $NetBSD: pmap.c,v 1.249 2003/03/03 22:43:58 pk Exp $ */
/* /*
* Copyright (c) 1996 * Copyright (c) 1996
@ -6356,13 +6356,21 @@ pmap_kenter_pa4m(va, pa, prot)
sp = &rp->rg_segmap[vs]; sp = &rp->rg_segmap[vs];
s = splvm(); s = splvm();
#ifdef notyet
/* XXX - we can be called with the kernel map already locked
* pmap_enter4m()->pv_link()->pool_get()
* figure out another way to protect `sg_npte' update.
*/
simple_lock(&pm->pm_lock); simple_lock(&pm->pm_lock);
#endif
tpte = sp->sg_pte[VA_SUN4M_VPG(va)]; tpte = sp->sg_pte[VA_SUN4M_VPG(va)];
KASSERT((tpte & SRMMU_TETYPE) != SRMMU_TEPTE); KASSERT((tpte & SRMMU_TETYPE) != SRMMU_TEPTE);
sp->sg_npte++; sp->sg_npte++;
setpgt4m(&sp->sg_pte[VA_SUN4M_VPG(va)], pteproto); setpgt4m(&sp->sg_pte[VA_SUN4M_VPG(va)], pteproto);
#ifdef notyet
simple_unlock(&pm->pm_lock); simple_unlock(&pm->pm_lock);
#endif
splx(s); splx(s);
} }