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From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Taniya Das <tdas@codeaurora.org>
Cc: linux-arm-kernel@lists.infradead.org,
	linux-arm-msm@vger.kernel.org, tsoni@codeaurora.org
Subject: Re: arm_memblock_steal() API usage
Date: Tue, 3 Apr 2012 08:30:54 +0100	[thread overview]
Message-ID: <20120403073053.GO24211@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <4F7A76B3.3070405@codeaurora.org>

On Tue, Apr 03, 2012 at 09:34:03AM +0530, Taniya Das wrote:
> I have a requirement where I need around ~100 bytes of memory to save  
> contents of
> registers to a non-cached area before going into low power mode.
>
> I did do some analysis on a 1GB RAM device of allocating 8 bytes using  
> the API and the below was the result
> was showing allocating only 8 bytes.
>
> API used : -  arm_memblock_steal(SZ_8, SZ_64K);--> physical address  
> returned is 0x3b1f0000

It's silly to use this for the above purpose.  Why not just use kmalloc
and cache flushing to ensure that the data is pushed out to RAM?

> Also is this API advisable for devices with low system RAM?

No.

  reply	other threads:[~2012-04-03  7:31 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-03  4:04 arm_memblock_steal() API usage Taniya Das
2012-04-03  7:30 ` Russell King - ARM Linux [this message]
2012-04-04  5:06   ` Taniya Das

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