linux-kernel - RE: Linux 2.6.38-rc1 doesn't boot

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Date:	Fri, 21 Jan 2011 15:18:59 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	"Anvin, H Peter" <h.peter.anvin@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	"Lu, Hongjiu" <hongjiu.lu@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Sam Ravnborg <sam@...nborg.org>
Subject: RE: Linux 2.6.38-rc1 doesn't boot

On Thu, 2011-01-20 at 23:08 +0800, Anvin, H Peter wrote:
> (The patch will need to be paired with removing the hacks in the linker script.)
> 
> -----Original Message-----
> From: Ingo Molnar [mailto:mingo@...e.hu] 
> Sent: Thursday, January 20, 2011 3:26 AM
> To: Li, Shaohua
> Cc: Anvin, H Peter; Markus Trippelsdorf; Lu, Hongjiu; Linus Torvalds; Linux Kernel Mailing List; Sam Ravnborg
> Subject: Re: Linux 2.6.38-rc1 doesn't boot
> 
> 
> * Shaohua Li <shaohua.li@...el.com> wrote:
> 
> > it's not a build failure, without it, my i386 kernel can't boot
> > actually.
> 
> Please try hpa's patch in this thread on top of very latest (today's) -git or latest 
> -tip:
> 
>    http://people.redhat.com/mingo/tip.git/README
> 
> Does that result in a booting system? That way we can avoid most of the linker 
> script madness.
Need some changes to make it compile and work on both 32 and 64 bit
kernel. below one is working for me:

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index bf47007..d8f1c6d 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -34,11 +34,9 @@ OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT)
 #ifdef CONFIG_X86_32
 OUTPUT_ARCH(i386)
 ENTRY(phys_startup_32)
-jiffies = jiffies_64;
 #else
 OUTPUT_ARCH(i386:x86-64)
 ENTRY(phys_startup_64)
-jiffies_64 = jiffies;
 #endif
 
 #if defined(CONFIG_X86_64) && defined(CONFIG_DEBUG_RODATA)
@@ -203,6 +201,7 @@ SECTIONS
 		*(.jiffies)
 	}
 	jiffies = VVIRT(.jiffies);
+	jiffies_64 = jiffies;
 
 	.vsyscall_3 ADDR(.vsyscall_0) + 3072: AT(VLOAD(.vsyscall_3)) {
 		*(.vsyscall_3)
diff --git a/kernel/timer.c b/kernel/timer.c
index 43ca993..36cb5e3 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -41,6 +41,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 
+#include <asm/byteorder.h>
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
 #include <asm/div64.h>
@@ -53,6 +54,11 @@
 u64 jiffies_64 __cacheline_aligned_in_smp = INITIAL_JIFFIES;
 
 EXPORT_SYMBOL(jiffies_64);
+#if defined(__LITTLE_ENDIAN) || (BITS_PER_LONG >= 64)
+asm(".global jiffies; jiffies = jiffies_64");
+#else
+asm(".global jiffies; jiffies = jiffies_64 + 4");
+#endif
 
 /*
  * per-CPU timer vector definitions:


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