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SubjectRE: Linux 2.6.38-rc1 doesn't boot
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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@elte.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@intel.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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