Re: [PATCH for review] [140/145] i386: mark cpu_dev structures as __cpuinitdata
From: Chuck Ebbert
Date: Tue Aug 15 2006 - 02:49:20 EST
On Mon, 14 Aug 2006 10:26:23 +0900, Magnus Damm wrote:
> > > The different cpu_dev structures are all used from __cpuinit callers what
> > > I can tell. So mark them as __cpuinitdata instead of __initdata. I am a
> > > little bit unsure about arch/i386/common.c:default_cpu, especially when it
> > > comes to the purpose of this_cpu.
> > But none of these CPUs supports hotplug and only one (AMD) does SMP.
> > So this is just wasting space in the kernel at runtime.
> How could this be wasting space? If you compile with CONFIG_HOTPLUG_CPU
> disabled then __cpuinitdata will become __initdata - ie the same as
> before. Not a single byte wasted what I can tell.
I was talking about wasted space with HOTPLUG_CPU enabled, of course.
Nobody is ever going to hotplug a VIA, Cyrix, Geode, etc. CPU, yet your
patch makes the kernel carry that code and data anyway.
Yes, the checking scripts will complain. But we know it's OK.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/