linux-kernel - Re: [Kgdb-bugreport] [PATCH 09/37] kgdb,blackfin: Add in kgdb_arch_set

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Message-ID: <8bd0f97a1001061208x8876e79y507d98e505071067@mail.gmail.com>
Date:	Wed, 6 Jan 2010 15:08:18 -0500
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Jason Wessel <jason.wessel@...driver.com>
Cc:	Sonic Zhang <sonic.adi@...il.com>,
	"Zhang, Sonic" <Sonic.Zhang@...log.com>,
	kgdb-bugreport@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	mingo@...e.hu
Subject: Re: [Kgdb-bugreport] [PATCH 09/37] kgdb,blackfin: Add in 
	kgdb_arch_set_pc for blackfin

On Wed, Jan 6, 2010 at 14:43, Jason Wessel wrote:
> I pulled in this patch, and made the changes the Mike talked about with
> respect to cleaning up the arch specific kgdb.c for blackfin.  See the
> attached patch.
>
> Your patch and the one here will go into kgdb-next and onto linux-next.

the Blackfin versions tail into the common probe_kernel_{read,write}
funcs, so your patch causes an infinite recursion in the common case.
as i hinted earlier, i'd like to see mm/access.c to have something
like:
-long probe_kernel_read(void *dst, void *src, size_t size)
+long __probe_kernel_read(void *dst, void *src, size_t size)
...
+long __weak probe_kernel_read(void *dst, void *src, size_t size)
    __attribute__((alias("__probe_kernel_read")));
that way the arch-specific probe_kernel_read can still fall back to
the common __probe_kernel_read function.  same goes for the write
function.

also, i see you added "notrace" to the Blackfin probe_kernel_write ...
was that intentional ?  if so, this should probably go into
include/linux/uaccess.h instead

otherwise, this looks pretty good.  thanks for doing the footwork ! :)
-mike
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