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Re: [PATCH/RFC 3/3] s390: query dynamic DEBUG_PAGEALLOC setting

From Thomas Gleixner <tglx@linutronix.de>
Newsgroups linux.kernel
Subject Re: [PATCH/RFC 3/3] s390: query dynamic DEBUG_PAGEALLOC setting
Date 2016-01-26 21:50 +0100
Message-ID <qViIO-1ad-17@gated-at.bofh.it> (permalink)
References <qV7X4-1ZG-13@gated-at.bofh.it> <qV7X5-1ZG-33@gated-at.bofh.it> <qVgnE-7Zo-15@gated-at.bofh.it>
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On Tue, 26 Jan 2016, Heiko Carstens wrote:
> On Tue, Jan 26, 2016 at 10:18:25AM +0100, Christian Borntraeger wrote:
> > We can use debug_pagealloc_enabled() to check if we can map
> > the identity mapping with 1MB/2GB pages as well as to print
> > the current setting in dump_stack.
> > 
> > Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
> > ---
> >  arch/s390/kernel/dumpstack.c |  4 +++-
> >  arch/s390/mm/vmem.c          | 10 ++++------
> >  2 files changed, 7 insertions(+), 7 deletions(-)
> > 
> > diff --git a/arch/s390/kernel/dumpstack.c b/arch/s390/kernel/dumpstack.c
> > index dc8e204..a1c0530 100644
> > --- a/arch/s390/kernel/dumpstack.c
> > +++ b/arch/s390/kernel/dumpstack.c
> > @@ -11,6 +11,7 @@
> >  #include <linux/export.h>
> >  #include <linux/kdebug.h>
> >  #include <linux/ptrace.h>
> > +#include <linux/mm.h>
> >  #include <linux/module.h>
> >  #include <linux/sched.h>
> >  #include <asm/processor.h>
> > @@ -186,7 +187,8 @@ void die(struct pt_regs *regs, const char *str)
> >  	printk("SMP ");
> >  #endif
> >  #ifdef CONFIG_DEBUG_PAGEALLOC
> > -	printk("DEBUG_PAGEALLOC");
> > +	printk("DEBUG_PAGEALLOC(%s)",
> > +		debug_pagealloc_enabled() ? "enabled" : "disabled");
> >  #endif
> 
> I'd prefer if you change this to
> 
> 	if (debug_pagealloc_enabled())
> 		printk("DEBUG_PAGEALLOC");
> 
> That way we can get rid of yet another ifdef. Having
> "DEBUG_PAGEALLOC(disabled)" doesn't seem to be very helpful.

Yes, same for x86 please.

Thanks,

	tglx

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Thread

[PATCH/RFC 0/3] Optimize CONFIG_DEBUG_PAGEALLOC Christian Borntraeger <borntraeger@de.ibm.com> - 2016-01-26 10:20 +0100
  [PATCH/RFC 3/3] s390: query dynamic DEBUG_PAGEALLOC setting Christian Borntraeger <borntraeger@de.ibm.com> - 2016-01-26 10:20 +0100
    Re: [PATCH/RFC 3/3] s390: query dynamic DEBUG_PAGEALLOC setting Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-01-26 19:20 +0100
      Re: [PATCH/RFC 3/3] s390: query dynamic DEBUG_PAGEALLOC setting Thomas Gleixner <tglx@linutronix.de> - 2016-01-26 21:50 +0100
      Re: [PATCH/RFC 3/3] s390: query dynamic DEBUG_PAGEALLOC setting David Rientjes <rientjes@google.com> - 2016-01-27 00:30 +0100
        Re: [PATCH/RFC 3/3] s390: query dynamic DEBUG_PAGEALLOC setting Joonsoo Kim <iamjoonsoo.kim@lge.com> - 2016-01-27 01:20 +0100
          Re: [PATCH/RFC 3/3] s390: query dynamic DEBUG_PAGEALLOC setting David Rientjes <rientjes@google.com> - 2016-01-27 01:40 +0100
            Re: [PATCH/RFC 3/3] s390: query dynamic DEBUG_PAGEALLOC setting Joonsoo Kim <iamjoonsoo.kim@lge.com> - 2016-01-27 02:00 +0100
              Re: [PATCH/RFC 3/3] s390: query dynamic DEBUG_PAGEALLOC setting Christian Borntraeger <borntraeger@de.ibm.com> - 2016-01-27 09:00 +0100
              Re: [PATCH/RFC 3/3] s390: query dynamic DEBUG_PAGEALLOC setting Vlastimil Babka <vbabka@suse.cz> - 2016-01-27 13:50 +0100
                Re: [PATCH/RFC 3/3] s390: query dynamic DEBUG_PAGEALLOC setting Christian Borntraeger <borntraeger@de.ibm.com> - 2016-01-27 13:50 +0100
                Re: [PATCH/RFC 3/3] s390: query dynamic DEBUG_PAGEALLOC setting Christian Borntraeger <borntraeger@de.ibm.com> - 2016-01-27 14:10 +0100
                Re: [PATCH/RFC 3/3] s390: query dynamic DEBUG_PAGEALLOC setting Vlastimil Babka <vbabka@suse.cz> - 2016-01-27 14:10 +0100

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