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Add invariants to vm_page_busy() and vm_page_wakeup() to check for

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PG_BUSY stupidity.
This commit is contained in:
Matthew Dillon 1999-01-24 01:05:15 +00:00
parent c9fa34cf07
commit a7039a1d42
1 changed files with 12 additions and 1 deletions
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13
sys/vm/vm_page.h
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@ -61,7 +61,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_page.h,v 1.50 1999/01/21 08:29:12 dillon Exp $
* $Id: vm_page.h,v 1.51 1999/01/21 10:06:24 dillon Exp $
*/
/*
@ -312,6 +312,7 @@ vm_page_assert_wait(vm_page_t m, int interruptible)
static __inline void
vm_page_busy(vm_page_t m)
{
KASSERT((m->flags & PG_BUSY) == 0, ("vm_page_busy: page already busy!!!"));
vm_page_flag_set(m, PG_BUSY);
}
@ -341,6 +342,7 @@ vm_page_flash(vm_page_t m)
static __inline void
vm_page_wakeup(vm_page_t m)
{
KASSERT(m->flags & PG_BUSY, ("vm_page_wakeup: page not busy!!!"));
vm_page_flag_clear(m, PG_BUSY);
vm_page_flash(m);
}
@ -426,6 +428,15 @@ vm_page_unhold(vm_page_t mem)
KASSERT(mem->hold_count >= 0, ("vm_page_unhold: hold count < 0!!!"));
}
/*
* vm_page_protect:
*
* Reduce the protection of a page. This routine never
* raises the protection and therefore can be safely
* called if the page is already at VM_PROT_NONE ( it
* will be a NOP effectively ).
*/
static __inline void
vm_page_protect(vm_page_t mem, int prot)
{