linux-kernel - Re: [PATCH 2/5] acpi/numa: check if parsing acpi numa info disabled earlier

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Message-ID: <1360026738.4449.8.camel@liguang.fnst.cn.fujitsu.com>
Date:	Tue, 05 Feb 2013 09:12:18 +0800
From:	li guang <lig.fnst@...fujitsu.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	x86@...nel.org
Subject: Re: [PATCH 2/5] acpi/numa: check if parsing acpi numa info
 disabled earlier

在 2013-02-04一的 11:41 -0800，David Rientjes写道：
> On Mon, 4 Feb 2013, liguang wrote:
> 
> > Signed-off-by: liguang <lig.fnst@...fujitsu.com>
> 
> Because there's no changelog, I have to read the patch to figure out what 
> it's doing since the title isn't that helpful either.  Please provide a 
> description of what problem you're trying to fix or what improvement 
> you're trying to make so it's clear.
> 
> > ---
> >  arch/x86/mm/srat.c  |    6 ------
> >  drivers/acpi/numa.c |    2 ++
> >  2 files changed, 2 insertions(+), 6 deletions(-)
> > 
> > diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c
> > index a837c95..78c67bd 100644
> > --- a/arch/x86/mm/srat.c
> > +++ b/arch/x86/mm/srat.c
> > @@ -60,8 +60,6 @@ acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
> >  	int pxm, node;
> >  	int apic_id;
> >  
> > -	if (srat_disabled())
> > -		return;
> >  	if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
> >  		bad_srat();
> >  		return;
> > @@ -100,8 +98,6 @@ acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
> >  	int pxm, node;
> >  	int apic_id;
> >  
> > -	if (srat_disabled())
> > -		return;
> >  	if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
> >  		bad_srat();
> >  		return;
> > @@ -148,8 +144,6 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
> >  	u64 start, end;
> >  	int node, pxm;
> >  
> > -	if (srat_disabled())
> > -		return -1;
> >  	if (ma->header.length != sizeof(struct acpi_srat_mem_affinity)) {
> >  		bad_srat();
> >  		return -1;
> > diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
> > index cb31298..1f51222 100644
> > --- a/drivers/acpi/numa.c
> > +++ b/drivers/acpi/numa.c
> > @@ -262,6 +262,8 @@ static int __init acpi_parse_srat(struct acpi_table_header *table)
> >  	struct acpi_table_srat *srat;
> >  	if (!table)
> >  		return -EINVAL;
> > +	if (srat_disabled())
> > +		return -EACCES;
> >  
> >  	srat = (struct acpi_table_srat *)table;
> >  	acpi_srat_revision = srat->header.revision;
> 
> Nack, this isn't helpful since SRAT is only for x86 and other 
> architectures use this code.  It would break the build on ia64 since it's 
> obviously not going to have a function called srat_disabled().
> 
> And -EACCES would not be the appropriate return value, this has nothing to 
> do with permissions.

Yes, you're right, will drop this change.



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