linux-kernel - Re: linux-next: tip tree build warning

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Message-ID: <20091108131645.GD5300@lenovo>
Date:	Sun, 8 Nov 2009 16:16:45 +0300
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: linux-next: tip tree build warning

[Ingo Molnar - Wed, Oct 28, 2009 at 08:50:12AM +0100]
| 
| * Stephen Rothwell <sfr@...b.auug.org.au> wrote:
| 
| > Hi all,
| > 
| > On Wed, 28 Oct 2009 18:41:26 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
| > >
| > > static inline physid_mask_t default_apicid_to_cpu_present(int phys_apicid)
| > > {
| > >         return physid_mask_of_physid(phys_apicid);
| > > }
| > 
| > I just noticed that this function (default_apicid_to_cpu_present) is 
| > declared "static inline in a header" but looks like it is only used by 
| > assigning its address to a function pointer.  Its only use for x86_64 
| > is in arch/x86/kernel/apic/apic_noop.c ...
| 
| yes, that might be a real problem - returning the mask like that is 
| messy. Thanks, will check.
| 
| 	Ingo
| 

Darn, my fault sorry! Here is an update which fixes the issue.
(Btw, Stephen could you CC me next time if you get commit id
 with me in authors, so I wouldn't miss problem).

Please review, comments/complains are quite welcome!

	-- Cyrill
---
x86,apic: Get rid of apicid_to_cpu_present assign on X86-64

In fact it's never get used on x86-64 (for 64 bit platform
we use differ technique to enumerate io-units).

Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
---
 arch/x86/kernel/apic/apic_noop.c |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux-2.6.git/arch/x86/kernel/apic/apic_noop.c
=====================================================================
--- linux-2.6.git.orig/arch/x86/kernel/apic/apic_noop.c
+++ linux-2.6.git/arch/x86/kernel/apic/apic_noop.c
@@ -162,7 +162,12 @@ struct apic apic_noop = {
 
 	.cpu_to_logical_apicid		= noop_cpu_to_logical_apicid,
 	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
+
+#ifdef CONFIG_X86_32
 	.apicid_to_cpu_present		= default_apicid_to_cpu_present,
+#else
+	.apicid_to_cpu_present		= NULL,
+#endif
 
 	.setup_portio_remap		= NULL,
 	.check_phys_apicid_present	= default_check_phys_apicid_present,
--
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