linux-kernel - Re: [PATCH 5/8] x86: apic - unify hard_smp_processor

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Date:	Sat, 23 Aug 2008 13:16:55 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Cyrill Gorcunov" <gorcunov@...il.com>
Cc:	mingo@...e.hu, macro@...ux-mips.org, hpa@...or.com,
	tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/8] x86: apic - unify hard_smp_processor_id

On Sat, Aug 23, 2008 at 12:45 PM, Cyrill Gorcunov <gorcunov@...il.com> wrote:
> [Yinghai Lu - Sat, Aug 23, 2008 at 12:13:21PM -0700]
> | On Sat, Aug 23, 2008 at 6:01 AM, Cyrill Gorcunov <gorcunov@...il.com> wrote:
> | > Move hard_smp_processor_id to apic_32.c.
> | > There is no need to keep it in header - we are linked to
> | > apic_xx.c code anyway.
> | >
> | > Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
> | > ---
> | >  arch/x86/kernel/apic_32.c |    5 +++++
> | >  include/asm-x86/smp.h     |   10 ----------
> | >  2 files changed, 5 insertions(+), 10 deletions(-)
> | >
> | > diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
> | > index ad295cf..c71a77c 100644
> | > --- a/arch/x86/kernel/apic_32.c
> | > +++ b/arch/x86/kernel/apic_32.c
> | > @@ -1569,6 +1569,11 @@ void __cpuinit generic_processor_info(int apicid, int version)
> | >        cpu_set(cpu, cpu_present_map);
> | >  }
> | >
> | > +int hard_smp_processor_id(void)
> | > +{
> | > +       return read_apic_id();
> | > +}
> | > +
> | >  /*
> | >  * Power management
> | >  */
> | > diff --git a/include/asm-x86/smp.h b/include/asm-x86/smp.h
> | > index 29324c1..914a73d 100644
> | > --- a/include/asm-x86/smp.h
> | > +++ b/include/asm-x86/smp.h
> | > @@ -185,17 +185,7 @@ static inline unsigned int read_apic_id(void)
> | >  }
> | >  #endif
> | >
> | > -
> | > -# if defined(APIC_DEFINITION) || defined(CONFIG_X86_64)
> | >  extern int hard_smp_processor_id(void);
> | > -# else
> | > -#include <mach_apicdef.h>
> | > -static inline int hard_smp_processor_id(void)
> | > -{
> | > -       /* we don't want to mark this access volatile - bad code generation */
> | > -       return read_apic_id();
> | > -}
> | > -# endif /* APIC_DEFINITION */
> | >
> | >  #else /* CONFIG_X86_LOCAL_APIC */
> | >
> | > --
> | > 1.6.0.6.gc667
> | >
> | >
> |
> | this one seems have some problem with 32bit with genericarch
> |
> | because we have
> |
> | int hard_smp_processor_id(void)
> | {
> |         return genapic->get_apic_id(*(unsigned long *)(APIC_BASE+APIC_ID));
> | }
> |
> | arch/x86/mach-generic/probe.c
> |
> | updated 64 bit to have MACRO.
> |
> | YH
> |
>
> thanks Yinghai, but isn't it called _after_ x86 apic chip
> initialized?

32 bit need to do sth special when subarch

YH
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