From: "Luis R. Rodriguez" <redacted>
Date: Mon, 23 Apr 2012 19:46:43 -0700

From: "Luis R. Rodriguez" <redacted>

pr_fmt() is either defined or we redefine it. Typically
drivers define it prior to including printk.h but this
is done under the assumption that no other subsystem
it uses has already defined pr_fmt(). In such cases
pr_fmt() should be undefined and redefined.

Doing this properly shaves down compilation time quite
considerably.

Signed-off-by: Luis R. Rodriguez <redacted>

Every driver defines pr_fmt then includes the headers.  I do not
see any other place which performs the initial undef of pr_fmt
like you want to start doing here.

If there is a reason we should start doing this, it would appear
to be a universal reason, not one specific to this driver.  If
that's the case, we should formally agree to this and then work
on gradually converting all the drivers in reasonably sized chunks.

Either way I can't apply this patch as-is, sorry Luis.