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From: Sasha Levin <sasha.levin@oracle.com>
To: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: linux-kernel@vger.kernel.org, m.szyprowski@samsung.com,
	akpm@linux-foundation.org, lauraa@codeaurora.org
Subject: Re: [PATCH v2 3/3] mm: cma: release trigger
Date: Tue, 27 Jan 2015 15:13:52 -0500	[thread overview]
Message-ID: <54C7F180.1030505@oracle.com> (raw)
In-Reply-To: <54C7D801.3070502@oracle.com>

On 01/27/2015 01:25 PM, Sasha Levin wrote:
> On 01/27/2015 03:10 AM, Joonsoo Kim wrote:
>>> >> +		if (mem->n <= count) {
>>>> >> > +			cma_release(cma, mem->p, mem->n);
>>>> >> > +			count -= mem->n;
>>>> >> > +			kfree(mem);
>>>> >> > +		} else {
>>>> >> > +			cma_release(cma, mem->p, count);
>>>> >> > +			mem->p += count;
>>>> >> > +			mem->n -= count;
>>>> >> > +			count = 0;
>>>> >> > +			cma_add_to_cma_mem_list(mem);
>>>> >> > +		}
>>>> >> > +	}
>> > If order_per_bit is not 0 and count used in cma_release() is
>> > different with the count used in cma_alloc(), problem could
>> > occur since bitmap management code can't handle that situation.
>> > 
>> > Could we just disable this case in this testing module?
> How should it behave then? Just free a max of 'count' pages and
> stop beforehand if we're going to go over it?

Actually, Can I just check for order_per_bit == 0 and execute it
then? I don't want to avoid testing these paths.


Thanks,
Sasha

  reply	other threads:[~2015-01-27 20:14 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-26 14:26 [PATCH v2 0/3] mm: cma: debugfs access to CMA Sasha Levin
2015-01-26 14:26 ` [PATCH v2 1/3] mm: cma: debugfs interface Sasha Levin
2015-01-26 14:26 ` [PATCH v2 2/3] mm: cma: allocation trigger Sasha Levin
2015-01-27  8:06   ` Joonsoo Kim
2015-01-27 15:08     ` Sasha Levin
2015-01-28  1:34       ` Joonsoo Kim
2015-01-26 14:26 ` [PATCH v2 3/3] mm: cma: release trigger Sasha Levin
2015-01-27  8:10   ` Joonsoo Kim
2015-01-27 18:25     ` Sasha Levin
2015-01-27 20:13       ` Sasha Levin [this message]
2015-01-28  1:35         ` Joonsoo Kim

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