oops if free a locked page

Andrea Arcangeli (andrea@suse.de)
Tue, 22 Jun 1999 19:37:12 +0200 (CEST)

I have a problem with pre-2.3.8-2. It issues an Oops if I attempt to free
a locked page. I think I am allowed to free a locked page without first
unlock it, because if there's a waiter waiting for the page, the waiter
will have just increased the reference count of the page before go to
sleep on the page.

I want to run try_to_free_buffers() with the page locked and so I want to
be allowed to run:

/* And free the page */
page->buffers = NULL;
if (__free_page(page)) {
buffermem -= PAGE_SIZE;
return 1;
}

with the page locked. If try_to_free_buffers() will return 1, then I'll
avoid the unlock, otherwise I'll do the unlock but after a lot of time
(I'll take the page locked just ready for the shrink_mmap-inode path).
Right now I removed the BUG() in free-page.

Comments?

Andrea Arcangeli

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/