linux-kernel - Re: [tip:x86/xen] x86: use flush_tlb_others to implement flush_tlb

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Date:	Mon, 11 May 2009 16:00:41 +0100
From:	Ian Campbell <Ian.Campbell@...citrix.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <Jeremy.Fitzhardinge@...rix.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:x86/xen] x86: use flush_tlb_others to implement
	flush_tlb_all, fix

On Mon, 2009-05-11 at 09:12 -0400, Ingo Molnar wrote:

> which then does:
> 
> init/main.c:728: error: implicit declaration of function ‘init_smp_flush’

Er, yeah, that change is pretty bogus for !x86 (I guess you were
compiling for some other $ARCH?)

You could either take the original patch which made it an early initcall
instead (http://marc.info/?l=linux-kernel&m=124179652227660&w=2) or we
could move it much earlier into setup arch, as per:

Subject: Call init_smp_flush() from arch code

init_smp_flush() is x86 specific so call it from arch code rather than
generic code.

Signed-off-by: Ian Campbell <ian.campbell@...rix.com>

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 1b1c851..aade391 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -985,6 +985,8 @@ void __init setup_arch(char **cmdline_p)
 
 	e820_setup_gap();
 
+	init_smp_flush();
+
 #ifdef CONFIG_VT
 #if defined(CONFIG_VGA_CONSOLE)
 	if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
diff --git a/init/main.c b/init/main.c
index f798501..33ce929 100644
--- a/init/main.c
+++ b/init/main.c
@@ -651,7 +651,6 @@ asmlinkage void __init start_kernel(void)
 	vfs_caches_init_early();
 	cpuset_init_early();
 	page_cgroup_init();
-	init_smp_flush();
 	mem_init();
 	enable_debug_pagealloc();
 	cpu_hotplug_init();


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