linux-kernel - Re: [PATCH 10/37] kgdb: Make mem access function weak in kgdb.c and kgdb.h

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Date:	Sat, 26 Dec 2009 16:07:10 -0500
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Jason Wessel <jason.wessel@...driver.com>
Cc:	linux-kernel@...r.kernel.org, kgdb-bugreport@...ts.sourceforge.net,
	kdb@....sgi.com, mingo@...e.hu, Sonic Zhang <sonic.adi@...il.com>
Subject: Re: [PATCH 10/37] kgdb: Make mem access function weak in kgdb.c and 
	kgdb.h

On Wed, Dec 23, 2009 at 16:19, Jason Wessel wrote:
> L1 instruction memory and MMR memory on blackfin can not be accessed by
> common functions probe_kernel_read() and probe_kernel_write().
> Blackfin asks for 2/4 byte align access to MMR memory and DMA access to
> L1 instruction memory. These functions need to be reimplemented in
> architecture specific kgdb.c. Update documentation and prototypes as
> well.

considering these functions were made weak only because of
probe_kernel_(read|write), then perhaps it makes more sense to move
the work there.  it would mean that all consumers of these functions
work properly instead of just kgdb.

probe_kernel_write is already weak ... we just need to add weak to
probe_kernel_read i think, and make the functions available via a
"default" symbol so that arch overrides can tail back into the common
code when it makes sense.
-mike
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