linux-kernel - [RFC v2 4/6] x86/init: use linker table for i386 early setup

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Message-Id: <1455891343-10016-5-git-send-email-mcgrof@kernel.org>
Date:	Fri, 19 Feb 2016 06:15:41 -0800
From:	"Luis R. Rodriguez" <mcgrof@...nel.org>
To:	hpa@...or.com, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org, luto@...capital.net,
	boris.ostrovsky@...cle.com, rusty@...tcorp.com.au,
	david.vrabel@...rix.com, konrad.wilk@...cle.com, mcb30@...e.org,
	jgross@...e.com, andriy.shevchenko@...ux.intel.com,
	xen-devel@...ts.xensource.com,
	"Luis R. Rodriguez" <mcgrof@...nel.org>
Subject: [RFC v2 4/6] x86/init: use linker table for i386 early setup

This also annotates this is only used for PC and
lguest hardware subarchitectures.

v2: add X86_SUBARCH_XEN as well, as noted by Konrad,
    now tested by 0-day bot.

Signed-off-by: Luis R. Rodriguez <mcgrof@...nel.org>
---
 arch/x86/kernel/head32.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c
index 768fa3888066..0b41626e57fc 100644
--- a/arch/x86/kernel/head32.c
+++ b/arch/x86/kernel/head32.c
@@ -21,12 +21,16 @@
 #include <asm/bootparam_utils.h>
 #include <asm/x86_init.h>
 
-static void __init i386_default_early_setup(void)
+static void __init i386_set_setup_funcs(void)
 {
 	/* Initialize 32bit specific setup functions */
 	x86_init.resources.reserve_resources = i386_reserve_resources;
 	x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc;
 }
+x86_init_early(BIT(X86_SUBARCH_PC) |
+	       BIT(X86_SUBARCH_LGUEST) |
+	       BIT(X86_SUBARCH_XEN),
+	       NULL, NULL, i386_set_setup_funcs);
 
 asmlinkage __visible void __init i386_start_kernel(void)
 {
@@ -41,9 +45,6 @@ asmlinkage __visible void __init i386_start_kernel(void)
 	case X86_SUBARCH_CE4100:
 		x86_ce4100_early_setup();
 		break;
-	default:
-		i386_default_early_setup();
-		break;
 	}
 
 	x86_init_fn_init_tables();
-- 
2.7.0