From: David Woodhouse <dwmw2@infradead.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: torvalds@linux-foundation.org, iommu@lists.linux-foundation.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] intel-iommu: fix build with CONFIG_BRANCH_TRACER=y
Date: Tue, 07 Apr 2009 04:33:55 -0700 [thread overview]
Message-ID: <1239104035.22733.443.camel@macbook.infradead.org> (raw)
In-Reply-To: <20090407090229.GA2467@elte.hu>
On Tue, 2009-04-07 at 11:02 +0200, Ingo Molnar wrote:
> for_each_active_iommu() and for_each_iommu() uses some tricky
> C that is weird and borderline valid but does not allow the
> macro evaluation trick used by the branch tracer/profiler:
>
> drivers/pci/intr_remapping.c:680:28: error: macro "if" passed 2
> arguments, but takes just 1
>
> Switch it to a braced group statement.
It doesn't even need the braces -- just putting simple parens around the
comma-expression would have sufficed (that was Andrew's attempt).
But it's a workaround, not a fix -- if we're going to #define if() then
we should damn well make it transparent, and not have to work around
breakage in arbitrary places.
Hence the patch I sent to Linus last night, which fixes it in the
_right_ place:
http://marc.info/?l=linux-kernel&m=123907505308502&w=2
--
David Woodhouse Open Source Technology Centre
David.Woodhouse@intel.com Intel Corporation
next prev parent reply other threads:[~2009-04-07 11:34 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1238839639.3560.37.camel@macbook.infradead.org>
2009-04-07 5:37 ` [GIT *] intel-iommu updates for 2.6.30 (second batch) Ingo Molnar
2009-04-07 5:42 ` Ingo Molnar
2009-04-07 5:52 ` David Woodhouse
2009-04-07 5:44 ` David Woodhouse
2009-04-07 5:48 ` Ingo Molnar
2009-04-07 5:52 ` Ingo Molnar
2009-04-07 6:04 ` David Woodhouse
2009-04-07 6:15 ` Ingo Molnar
2009-04-07 6:18 ` David Woodhouse
2009-04-07 8:49 ` Ingo Molnar
2009-04-07 9:02 ` [PATCH] intel-iommu: fix build with CONFIG_BRANCH_TRACER=y Ingo Molnar
2009-04-07 11:33 ` David Woodhouse [this message]
2009-04-07 12:14 ` Ingo Molnar
2009-04-07 12:44 ` David Woodhouse
2009-04-07 12:57 ` Ingo Molnar
2009-04-07 13:14 ` David Woodhouse
2009-04-07 14:54 ` Linus Torvalds
2009-04-07 14:59 ` Linus Torvalds
2009-04-07 15:12 ` Ingo Molnar
[not found] ` <f73f7ab80904071540w3d298c3bh386b46d5685f746e@mail.gmail.com>
2009-04-07 22:42 ` Kyle Moffett
2009-04-07 14:50 ` Linus Torvalds
2009-04-07 6:39 ` [GIT *] intel-iommu updates for 2.6.30 (second batch) Ingo Molnar
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