linux-kernel - Re: Regression in serial console on ia64 after 2.6.22

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Date:	Tue, 24 Jul 2007 16:57:32 -0700
From:	Yinghai Lu <Yinghai.Lu@....COM>
To:	Yinghai.Lu@....COM, Horms <horms@...ge.net.au>
Cc:	linux-ia64 <linux-ia64@...r.kernel.org>,
	Tony Luck <tony.luck@...el.com>, Andi Kleen <ak@...e.de>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Russell King <rmk@....linux.org.uk>,
	Gerd Hoffmann <kraxel@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Subject: Re: Regression in serial console on ia64 after 2.6.22


IA64

Subject         : Regression in serial console on ia64 after 2.6.22
References      : http://marc.info/?l=linux-ia64&m=118483645914066&w=2
Last known good : ?
Submitter       : Horms <horms@...ge.net.au>
Caused-By       : Yinghai Lu <Yinghai.Lu@....COM>
                  commit 18a8bd949d6adb311ea816125ff65050df1f3f6e
Handled-By      : ?
Status          : unknown


please test this patch.

YH


[PATCH] ia64: move machvec_init before parse_early_param

So ia64_mv is initialized before early console

Signed-off-by: Yinghai Lu <yinghai.lu@....com>

diff --git a/arch/ia64/kernel/machvec.c b/arch/ia64/kernel/machvec.c
index 13df337..a94feaa 100644
--- a/arch/ia64/kernel/machvec.c
+++ b/arch/ia64/kernel/machvec.c
@@ -14,12 +14,6 @@ struct ia64_machine_vector ia64_mv;
 EXPORT_SYMBOL(ia64_mv);
 
 static __initdata const char *mvec_name;
-static __init int setup_mvec(char *s)
-{
-	mvec_name = s;
-	return 0;
-}
-early_param("machvec", setup_mvec);
 
 static struct ia64_machine_vector * __init
 lookup_machvec (const char *name)
@@ -42,6 +36,10 @@ machvec_init (const char *name)
 
 	if (!name)
 		name = mvec_name ? mvec_name : acpi_get_sysname();
+
+	if (!mvec_name)
+		mvec_name = name;
+
 	mv = lookup_machvec(name);
 	if (!mv)
 		panic("generic kernel failed to find machine vector for"
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index cf06fe7..b06d7b7 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -481,6 +481,9 @@ int __init reserve_elfcorehdr(unsigned long *start, unsigned long *end)
 void __init
 setup_arch (char **cmdline_p)
 {
+#ifdef CONFIG_IA64_GENERIC
+	char *mvstr;
+#endif
 	unw_init();
 
 	ia64_patch_vtop((u64) __start___vtop_patchlist, (u64) __end___vtop_patchlist);
@@ -491,12 +494,15 @@ setup_arch (char **cmdline_p)
 	efi_init();
 	io_port_init();
 
-	parse_early_param();
-
 #ifdef CONFIG_IA64_GENERIC
-	machvec_init(NULL);
+	mvstr = strstr(*cmd_line_p, "machvec=")
+	if (mvstr)
+		mvstr = strchr(mvstr, '=') + 1;
+	machvec_init(mvstr);
 #endif
 
+	parse_early_param();
+
 	if (early_console_setup(*cmdline_p) == 0)
 		mark_bsp_online();
 


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