linux-kernel - Re: [PATCH 2/11] x86: convert to generic helpers for IPI function calls

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Message-ID: <20080427102335.GS12774@kernel.dk>
Date:	Sun, 27 Apr 2008 12:23:36 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	npiggin@...e.de, torvalds@...ux-foundation.org,
	peterz@...radead.org, sam@...nborg.org
Subject: Re: [PATCH 2/11] x86: convert to generic helpers for IPI function  calls

On Fri, Apr 25 2008, Jeremy Fitzhardinge wrote:
> Jens Axboe wrote:
> >--- a/arch/x86/kernel/smp.c
> >+++ b/arch/x86/kernel/smp.c
> >  
> [...]
> >+void arch_send_call_function_single_ipi(int cpu)
> > {
> >  
> [...]
> >+void arch_send_call_function_ipi(cpumask_t mask)
> > {
> >  
> [...]
> >--- a/arch/x86/xen/smp.c
> >+++ b/arch/x86/xen/smp.c
> >+void arch_send_call_function_ipi(cpumask_t mask)
> >+{
> >  
> [...]
> >+void arch_send_call_function_single_ipi(int cpu)
> >+{
> >+	xen_send_IPI_mask(cpumask_of_cpu(cpu), 
> >XEN_CALL_FUNCTION_SINGLE_VECTOR);
> > 
> 
> Xen vs native is a runtime choice, so you can't just statically define 
> arch_send_call_function(_single)_ipi for each.  You need to define the 
> arch_* functions once, make them call via smp_ops, and call into the 
> respective native and Xen versions of the ipi functions.

Noted, I'll add it to smp_ops (like smp_call_function_mask() was
before).

> Aside from that it looks good, with a very appealing code size reduction.

Thanks!

-- 
Jens Axboe

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