lkml.org 
[lkml]   [2013]   [Feb]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v3 2/4] numa: avoid export acpi_numa variable
From
Date
在 2013-02-05二的 16:55 +0900,Yasuaki Ishimatsu写道:
> 2013/02/05 16:36, liguang wrote:
> > acpi_numa is used to prevent srat table
> > being parsed, seems a little miss-named,
> > if 'noacpi' was specified by cmdline and
> > CONFIG_ACPI_NUMA was enabled, acpi_numa
> > will be operated directly from everywhere
> > it needed to disable/enable numa in acpi
> > mode which was a bad thing, so, try to
> > export a fuction to get srat table
> > enable/disable info.
> >
> > Signed-off-by: liguang <lig.fnst@cn.fujitsu.com>
> > ---
>
> Hmm. Did you test the patch?
> By the patch, srat_disable() returns false(0) or 1. As a result,
> acpi_numa_x2apic_affinity_init(), acpi_numa_processor_affinity_init()
> and acpi_numa_memory_affinity_init() go wrong at following if sentence.
>
> ---
> if (srat_disable())
> return -1;
> ---
>
> When you change a return value of function, you should check othe
> functions which use it carefully.
>
> And if you use acpi_numa as bool, you should use "acpi_numa = true"
> instead of "acpi_numa = 1"

Good observation!
maybe I'm a little hurry to go for dining, :)
Thanks! will fix.

>
> Thanks,
> Yasuaki Ishimatsu
>
> > arch/x86/include/asm/acpi.h | 2 +-
> > arch/x86/kernel/acpi/srat.c | 17 +++++++++++------
> > arch/x86/mm/numa.c | 2 +-
> > arch/x86/xen/enlighten.c | 2 +-
> > 4 files changed, 14 insertions(+), 9 deletions(-)
> >
> > diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
> > index b31bf97..449e12a 100644
> > --- a/arch/x86/include/asm/acpi.h
> > +++ b/arch/x86/include/asm/acpi.h
> > @@ -177,7 +177,7 @@ static inline void disable_acpi(void) { }
> > #define ARCH_HAS_POWER_INIT 1
> >
> > #ifdef CONFIG_ACPI_NUMA
> > -extern int acpi_numa;
> > +extern void disable_acpi_numa(void);
> > extern int x86_acpi_numa_init(void);
> > #endif /* CONFIG_ACPI_NUMA */
> >
> > diff --git a/arch/x86/kernel/acpi/srat.c b/arch/x86/kernel/acpi/srat.c
> > index cdd0da9..8d7f3f8 100644
> > --- a/arch/x86/kernel/acpi/srat.c
> > +++ b/arch/x86/kernel/acpi/srat.c
> > @@ -24,22 +24,27 @@
> > #include <asm/apic.h>
> > #include <asm/uv/uv.h>
> >
> > -int acpi_numa __initdata;
> > +static bool acpi_numa __initdata;
> >
> > static __init int setup_node(int pxm)
> > {
> > return acpi_map_pxm_to_node(pxm);
> > }
> >
> > -static __init void bad_srat(void)
> > +void __init disable_acpi_numa(void)
> > {
> > - printk(KERN_ERR "SRAT: SRAT not used.\n");
> > - acpi_numa = -1;
> > + acpi_numa = false;
> > }
> >
> > -static __init inline int srat_disabled(void)
> > +static void __init bad_srat(void)
> > {
> > - return acpi_numa < 0;
> > + disable_acpi_numa();
> > + printk(KERN_ERR "SRAT: SRAT will not be used.\n");
> > +}
> > +
> > +static bool __init srat_disabled(void)
> > +{
> > + return acpi_numa;
> > }
> >
> > /* Callback for SLIT parsing */
> > diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> > index 245a4ba..1ebc907 100644
> > --- a/arch/x86/mm/numa.c
> > +++ b/arch/x86/mm/numa.c
> > @@ -47,7 +47,7 @@ static __init int numa_setup(char *opt)
> > #endif
> > #ifdef CONFIG_ACPI_NUMA
> > if (!strncmp(opt, "noacpi", 6))
> > - acpi_numa = -1;
> > + disable_acpi_numa();
> > #endif
> > return 0;
> > }
> > diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> > index 657eca9..3636bc6 100644
> > --- a/arch/x86/xen/enlighten.c
> > +++ b/arch/x86/xen/enlighten.c
> > @@ -1447,7 +1447,7 @@ asmlinkage void __init xen_start_kernel(void)
> > * any NUMA information the kernel tries to get from ACPI will
> > * be meaningless. Prevent it from trying.
> > */
> > - acpi_numa = -1;
> > + disable_acpi_numa();
> > #endif
> >
> > /* Don't do the full vcpu_info placement stuff until we have a
> >
>
>


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2013-02-05 09:43    [W:0.040 / U:1.992 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site