Please don't drop CCs.
Qi, Yanling <Yanling.Qi@xxxxxxx> wrote:
>
>> Qi, Yanling <Yanling.Qi@xxxxxxx> wrote:
>> > @@ -2571,6 +2572,13 @@ sg_page_malloc(int rqSz, int lowDma, int
>> > resp = (char *) __get_free_pages(page_mask, order);
>> > /* try half */
>> > resSz = a_size;
>> > }
>> > + tmppage = virt_to_page(resp);
>> > + for( m = PAGE_SIZE; m < resSz; m += PAGE_SIZE )
>> > + {
>> > + tmppage++;
>> > + SetPageReserved(tmppage);
>> > + }
>> > +
>>
> [Qi, Yanling]
> If I do a get_page() at sg_page_malloc() time and then do a put_page()
> at sg_page_free() time, I worry about a race condition that the page
> gets re-used before calling free_pages().
Could you explain what is going to cause this page to be reused if it
has a non-zero reference count?
Thanks,
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