/* Allocate 2^@order contiguous pages. */
static struct page_info *alloc_heap_pages(
unsigned int zone_lo, unsigned int zone_hi,
unsigned int node, unsigned int order, unsigned int memflags)
{
cpus_clear(mask);
for ( i = 0; i < (1 << order); i++ )
{
if ( pg[i].u.free.need_tlbflush )
{
/* Add in extra CPUs that need flushing because of this page. */
cpus_andnot(extra_cpus_mask, cpu_online_map, mask);
tlbflush_filter(extra_cpus_mask, pg[i].tlbflush_timestamp);
cpus_or(mask, mask, extra_cpus_mask);
}
}
if ( unlikely(!cpus_empty(mask)) )
{
perfc_incr(need_flush_tlb_flush);
flush_tlb_mask(&mask);
}
return pg;
}
Is this equal to : in pg[1<<order-1].u.free.need_tlbflush, if we
compute mask=0, then flush TLB mask ?
