From: Paul Mackerras <paulus@samba.org>
To: Linh Dang <dang.linh@gmail.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH][PPC32[NEWBIE] enhancement to virt_to_bus/bus_to_virt (try 2)
Date: Fri, 3 Dec 2004 07:31:14 +1100 [thread overview]
Message-ID: <16815.31634.698591.747661@cargo.ozlabs.ibm.com> (raw)
In-Reply-To: <3b2b320041202082812ee4709@mail.gmail.com>
Linh Dang writes:
> In 2.6.9 on non-APUS ppc32 platforms, virt_to_bus() will just subtract
> KERNELBASE from the the virtual address. bus_to_virt() will perform
> the reverse operation.
>
> This patch will make virt_to_bus():
>
> - perform the current operation if the virtual address is between
> KERNELBASE and ioremap_bot.
Why do you want to do this? The only code that should be using
virt_to_bus or bus_to_virt is the DMA API code, and it's happy with
them the way they are.
> The patch also changes virt_to_phys()/phys_to_virt() in a similar way.
What do you want to use them for? They are only for use in low-level
memory management code.
Paul.
next prev parent reply other threads:[~2004-12-02 20:33 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-02 14:49 [PATCH][PPC32] enhancement to virt_to_bus/bus_to_virt (resent with spell-checked subject line) Linh Dang
2004-12-02 16:28 ` [PATCH][PPC32[NEWBIE] enhancement to virt_to_bus/bus_to_virt (try 2) Linh Dang
2004-12-02 20:31 ` Paul Mackerras [this message]
2004-12-03 14:46 ` Linh Dang
2004-12-05 10:11 ` Eugene Surovegin
2004-12-05 19:18 ` Linh Dang
2004-12-05 20:52 ` Eugene Surovegin
2004-12-05 21:12 ` Paul Mackerras
2004-12-06 1:31 ` Linh Dang
2004-12-06 1:56 ` Linh Dang
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