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Initialize pmap->pm_refcount properly in pmap_pinit() and 

add simple_locks where pmap->pm_refcount are refered.

This should fix a long-standing "out of space kmem_map" panic bug on sun3x.
This commit is contained in:
tsutsui 2000-10-21 14:10:25 +00:00
parent 2ebf1a0cd0
commit e000111847
1 changed files with 15 additions and 10 deletions
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25
sys/arch/sun3/sun3x/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.54 2000/06/29 07:19:14 mrg Exp $ */
/* $NetBSD: pmap.c,v 1.55 2000/10/21 14:10:25 tsutsui Exp $ */
/*-
* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
@ -360,9 +360,11 @@ unsigned int NUM_A_TABLES, NUM_B_TABLES, NUM_C_TABLES;
#define NUM_KERN_PTES (KVAS_SIZE >> MMU_TIC_SHIFT)
/*************************** MISCELANEOUS MACROS *************************/
#define PMAP_LOCK() ; /* Nothing, for now */
#define PMAP_UNLOCK() ; /* same. */
#define NULL 0
#define pmap_lock(pmap) simple_lock(&pmap->pm_lock)
#define pmap_unlock(pmap) simple_unlock(&pmap->pm_lock)
#define pmap_add_ref(pmap) ++pmap->pm_refcount
#define pmap_del_ref(pmap) --pmap->pm_refcount
#define pmap_refcount(pmap) pmap->pm_refcount
static INLINE void * mmu_ptov __P((vm_offset_t pa));
static INLINE vm_offset_t mmu_vtop __P((void * va));
@ -825,6 +827,7 @@ pmap_bootstrap(nextva)
kernel_pmap.pm_a_tmgr = NULL;
kernel_pmap.pm_a_phys = kernAphys;
kernel_pmap.pm_refcount = 1; /* always in use */
simple_lock_init(&kernel_pmap.pm_lock);
kernel_crp.rp_attr = MMU_LONG_DTE_LU | MMU_DT_LONG;
kernel_crp.rp_addr = kernAphys;
@ -2567,6 +2570,8 @@ pmap_pinit(pmap)
bzero(pmap, sizeof(struct pmap));
pmap->pm_a_tmgr = NULL;
pmap->pm_a_phys = kernAphys;
pmap->pm_refcount = 1;
simple_lock_init(&pmap->pm_lock);
}
/* pmap_release INTERFACE
@ -2629,9 +2634,9 @@ pmap_reference(pmap)
if (pmap == NULL)
return;
/* pmap_lock(pmap); */
pmap->pm_refcount++;
/* pmap_unlock(pmap); */
pmap_lock(pmap);
pmap_add_ref(pmap);
pmap_unlock(pmap);
}
/* pmap_dereference INTERNAL
@ -2648,9 +2653,9 @@ pmap_dereference(pmap)
if (pmap == NULL)
return 0;
/* pmap_lock(pmap); */
rtn = --pmap->pm_refcount;
/* pmap_unlock(pmap); */
pmap_lock(pmap);
rtn = pmap_del_ref(pmap);
pmap_unlock(pmap);
return rtn;
}