linux-kernel - Re: [PATCH] mm-kasan-initial-memory-quarantine-implementation-v8-fix

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Message-ID: <CAG_fn=Xuv_b7k9VCPu=93Ats6eG6LvJn9cFDW75D=_OD=eawQw@mail.gmail.com>
Date:	Wed, 11 May 2016 16:30:53 +0200
From:	Alexander Potapenko <glider@...gle.com>
To:	Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	kasan-dev <kasan-dev@...glegroups.com>,
	Linux Memory Management List <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH] mm-kasan-initial-memory-quarantine-implementation-v8-fix

On Wed, May 11, 2016 at 1:11 PM, Andrey Ryabinin
<aryabinin@...tuozzo.com> wrote:
> On 05/11/2016 01:18 PM, Alexander Potapenko wrote:
>> On Tue, May 10, 2016 at 3:38 PM, Andrey Ryabinin
>> <aryabinin@...tuozzo.com> wrote:
>>>  * Fix comment styles,
>>  yDid you remove the comments from include/linux/kasan.h because they
>> were put inconsistently, or was there any other reason?
>
> We usually comment functions near definition, not declarations.
> If you like, put comment back. Just place it near definition.
>
>>>  * Get rid of some ifdefs
>> Thanks!
>>>  * Revert needless functions renames in quarantine patch
>> I believe right now the names are somewhat obscure. I agree however
>> the change should be done in a separate patch.
>
> Besides that, I didn't like the fact that you made names longer and exceeded
> 80-char limit in some places.
>
>>>  * Remove needless local_irq_save()/restore() in per_cpu_remove_cache()
>> Ack
>>>  * Add new 'struct qlist_node' instead of 'void **' types. This makes
>>>    code a bit more redable.
>> Nice, thank you!
>>
>> How do I incorporate your changes? Is it ok if I merge it with the
>> next version of my patch and add a "Signed-off-by: Andrey Ryabinin
>> <aryabinin@...tuozzo.com>" line to the description?
>>
>
> Ok, but I don't think that this is matters. Andrew will just craft a diff patch
> on top of the current code anyways.
> Or you can make such diff by yourself and send it, it's easier to review, after all.
>
The kernel crashed for me when I applied your patch.

I also had to make the following change:

+++ b/mm/kasan/quarantine.c
@@ -245,7 +245,7 @@ static void qlist_move_cache(struct qlist_head *from,

        prev = from->head;
        while (prev) {
-               struct qlist_node *qlink = prev->next;
+               struct qlist_node *qlink = prev;
                struct kmem_cache *obj_cache = qlink_to_cache(qlink);

                if (obj_cache == cache) {



-- 
Alexander Potapenko
Software Engineer

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