From: Andrew Morton <akpm@digeo.com>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: David Miller <davem@redhat.com>,
Paul Mackerras <paulus@samba.org>,
linux-kernel@vger.kernel.org,
linuxppc-embedded@lists.linuxppc.org
Subject: Re: [PATCH,RFC] Add gfp_mask to get_vm_area()
Date: Mon, 30 Sep 2002 22:08:00 -0700 [thread overview]
Message-ID: <3D992DB0.9A8942D@digeo.com> (raw)
In-Reply-To: 20021001044226.GS10265@zax
David Gibson wrote:
>
> Dave, please consider this patch. It renames get_vm_area() to
> __get_vm_area() and adds a gfp_mask parameter which is passed on to
> kmalloc(). get_vm_area(size,flags) is then defined as as
> __get_vm_area(size,flags,GFP_KERNEL) to avoid messing with existing
> callers.
>
> We need this in order to sanely make pci_alloc_consistent() (and other
> consistent allocation functions) obey the DMA-mapping.txt rules on PPC
> embedded machines (specifically the requirement that it be callable
> from interrupt context).
>
I can look after that for you. But I'd prefer that you just add the
extra gfp_flags argument to get_vm_area() and update the 16 callers.
You cannot call get_vm_area() from interrupt context at present;
it does write_lock(&vmlist_lock) unsafely.
It would be a bit sad to make vmlist_lock interrupt-safe for this. Is
there no alternative?
(And what the hell is arch/alpha/mm/init.c:callback_init() doing rewriting
vmlist? Somebody shoot that code)
next prev parent reply other threads:[~2002-10-01 5:02 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-01 4:42 [PATCH,RFC] Add gfp_mask to get_vm_area() David Gibson
2002-10-01 4:37 ` David S. Miller
2002-10-01 5:08 ` Andrew Morton [this message]
2002-10-01 5:34 ` David Gibson
2002-10-01 8:42 ` Russell King
2002-10-02 1:18 ` David Gibson
2002-10-03 4:39 ` David Gibson
2002-10-03 4:56 ` David Gibson
2002-10-03 15:18 ` Russell King
2002-10-04 3:27 ` David Gibson
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