linux-kernel - Re: [git pull] generic bitops, take 2

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Date:	Sat, 26 Apr 2008 19:28:43 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Alexander van Heukelum <heukelum@...lshack.com>,
	jdike@...toit.com
Subject: Re: [git pull] generic bitops, take 2


* Ingo Molnar <mingo@...e.hu> wrote:

> perhaps the combination of distcc and crosscompilers doesnt work well 
> on UML? (it works fine with other architectures)

so i tried a third build method, gcc 3.4, and that built it fine but UML 
crashed during bootup:

 dione:~/linux/linux-x86.q> ./linux
 Core dump limits :
         soft - 0
         hard - NONE
 Checking that ptrace can change system call numbers...OK
 Checking syscall emulation patch for ptrace...OK
 Checking advanced syscall emulation patch for ptrace...OK
 Checking for tmpfs mount on /dev/shm...OK
 Checking PROT_EXEC mmap in /dev/shm/...OK
 Checking for the skas3 patch in the host:
   - /proc/mm...not found: No such file or directory
   - PTRACE_FAULTINFO...not found
   - PTRACE_LDT...not found
 UML running in SKAS0 mode
 Segmentation fault

(gdb) bt
#0  0x000000006020fd92 in txInit ()
#1  0x000000006000a4c1 in init_jfs_fs ()
#2  0x0000000060001794 in do_initcalls ()
#3  0x000000006000196d in do_basic_setup ()
#4  0x0000000060001a14 in kernel_init ()
#5  0x0000000060028427 in run_kernel_thread ()
#6  0x000000006001d020 in new_thread_handler ()
#7  0x0000000000000000 in ?? ()

rip            0x6020fd92       0x6020fd92 <txInit+306>

txInit is in JFS.

but at least i could build UML. (this is all with pristine -git)

So i checked the patch below. And it built fine, and boo^H^Hcrashed just 
like it did before:

   - PTRACE_FAULTINFO...not found
   - PTRACE_LDT...not found
 UML running in SKAS0 mode
 Segmentation fault

so i guess this is the way to go?

	Ingo

---------------------->
Subject: uml: kconfig cleanup
From: Ingo Molnar <mingo@...e.hu>
Date: Sat Apr 26 19:10:17 CEST 2008

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/um/Kconfig.x86_64 |    7 +++++++
 1 file changed, 7 insertions(+)

Index: linux-x86.q/arch/um/Kconfig.x86_64
===================================================================
--- linux-x86.q.orig/arch/um/Kconfig.x86_64
+++ linux-x86.q/arch/um/Kconfig.x86_64
@@ -1,3 +1,10 @@
+
+menu "Host processor type and features"
+
+source "arch/x86/Kconfig.cpu"
+
+endmenu
+
 config UML_X86
 	bool
 	default y
--
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