/*
* remove user pages in a given range.
*/
void zap_page_range(struct mm_struct *mm, unsigned long address, unsigned long size)
{
pgd_t * dir;
unsigned long end = address + size;
int freed = 0;
dir = pgd_offset(mm, address);
/*
* This is a long-lived spinlock. That's fine.
* There's no contention, because the page table
* lock only protects against kswapd anyway, and
* even if kswapd happened to be looking at this
* process we _want_ it to get stuck.
*/
if (address >= end)
BUG();
spin_lock(&mm->page_table_lock);
do {
freed += zap_pmd_range(mm, dir, address, end - address);
address = (address + PGDIR_SIZE) & PGDIR_MASK;
dir++;
} while (address && (address < end));
spin_unlock(&mm->page_table_lock);
/*
* Update rss for the mm_struct (not necessarily current->mm)
* Notice that rss is an unsigned long.
*/
if (mm->rss > freed)
mm->rss -= freed;
else
mm->rss = 0;
}
/*
* remove user pages in a given range.
*/
int zap_page_range(struct mm_struct *mm, unsigned long address, unsigned long size)
{
pgd_t * dir;
unsigned long end = address + size;
dir = pgd_offset(mm, address);
flush_cache_range(mm, end - size, end);
while (address < end) {
zap_pmd_range(dir, address, end - address);
address = (address + PGDIR_SIZE) & PGDIR_MASK;
#ifdef CONFIG_BESTA
if (!address) break; /* unsigned overflow */
#endif
dir++;
}
flush_tlb_range(mm, end - size, end);
return 0;
}
