linux-kernel - Re: [PATCH -tip -v4] irq_work: generic hard-irq context callbacks

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Date:	Wed, 15 Sep 2010 09:51:57 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, paulus <paulus@...ba.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	dhowells <dhowells@...hat.com>,
	Russell King <rmk@....linux.org.uk>,
	Kyle McMartin <kyle@...artin.ca>, davem <davem@...emloft.net>,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH -tip -v4] irq_work: generic hard-irq context callbacks

On Wed, 15 Sep 2010 13:29:50 +0800
Huang Ying <ying.huang@...el.com> wrote:

> On Mon, 2010-09-13 at 19:36 +0800, Peter Zijlstra wrote:
> > On Mon, 2010-09-13 at 12:32 +0200, Martin Schwidefsky wrote:
> > > On Mon, 13 Sep 2010 14:50:48 +0800
> > > Huang Ying <ying.huang@...el.com> wrote:
> > > 
> > > > From:  Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > > > 
> > > > In order for other NMI context users that want to run things from
> > > > hard-IRQ context, extract the perf_event callback mechanism.
> > > > 
> > > > Huang Ying: some fixes
> > > > 
> > > > This patch is only tested on x86 platform.
> > > > 
> > > > 
> > > > v4:
> > > > 
> > > > -rebased on latest -tip tree
> > > > 
> > > > Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > > > Signed-off-by: Huang Ying <ying.huang@...el.com>
> > > 
> > > On s390 I get compile errors:
> > > 
> > > include/linux/perf_event.h:464:29: error: asm/perf_event.h: No such file or directory
> > > 
> > > Not a good idea to completely remove the perf_event.h from arch/s390/include/asm.
> > > With an empty header file the kernel at least compiles.
> > 
> > Urgh, Huang, could you at least compile test the other arches?
> 
> I uses the cross build tool from:
> 
> http://www.kernel.org/pub/tools/crosstool/
> 
> But I get compile errors on s390 and alpha even for tip/master
> (ce0c65112d37ff04016b4e0962a406281640739b). The build logs are attached.
> 
> Do I use the wrong git tree? Or we should fix tip/master firstly?
> 
> And frv and sh have compile error even for linus/master and 2.6.35. So I
> can not compile test for these arches.
> 
> Do I use the wrong cross tool?
> 
> The kernel configuration is generated as follow:
> 
> make defconfig
> ./scripts/config --enable perf_events

The compile error on s390 is a known problem in the -tip/-next tree introduced
with git commit 2bf2160d8805de64308e2e7c3cd97813cb58ed2f. The proposed solution
from Heiko as discussed on linux-next is this patch:

---
 arch/s390/include/asm/hardirq.h |    4 ----
 1 file changed, 4 deletions(-)

--- a/arch/s390/include/asm/hardirq.h
+++ b/arch/s390/include/asm/hardirq.h
@@ -12,10 +12,6 @@
 #ifndef __ASM_HARDIRQ_H
 #define __ASM_HARDIRQ_H
 
-#include <linux/threads.h>
-#include <linux/sched.h>
-#include <linux/cache.h>
-#include <linux/interrupt.h>
 #include <asm/lowcore.h>
 
 #define local_softirq_pending() (S390_lowcore.softirq_pending)


-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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