Re: [patch] take 2 Re: PG_swap_entry bug in recent kernels

[Andrea Arcangeli <andrea@suse.de>]

On Fri, 7 Apr 2000, Kanoj Sarcar wrote:

>> BTW, swap_out() always used the same locking order that I added to swapoff
>> so if my patch is wrong, swap_out() is always been wrong as well ;).
>
>Not sure what you mean ... swap_out never grabbed the mmap_sem/page_table_lock
>before (in 2.2. too).

In 2.2.x page_table_lock wasn't necessary because we was holding the big
kernel lock.

In 2.3.x vmlist_*_lock is alias to spin_lock(&mm->page_table_lock) and
swap_out isn't even calling the spin_lock explicitly but it's doing what
the fixed swapoff does.

Andrea

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