linux-kernel - Re: kernel building procedure changed?

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Message-ID: <20090223081429.GB29898@localhost>
Date:	Mon, 23 Feb 2009 11:14:29 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Sam Ravnborg <sam@...nborg.org>, Jiri Slaby <jirislaby@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: kernel building procedure changed?

[Cyrill Gorcunov - Mon, Feb 23, 2009 at 10:48:37AM +0300]

...

| Sam, it seems I never paid attention on Makefile
| rules before. Which means -- I don't know if kernel
| build procedure should behave like it do now.
| 
| We have the following rule (arch/x86/kernel/Makefile)
| 
| extra-y                := head_$(BITS).o head$(BITS).o head.o init_task.o
| vmlinux.lds
| 
| Does it mean that any obj-y targets should be built before
| extra-y? If "yes" -- all is fine and works well and I'm just
| noising here (sorry for that).
| 
| To be precise -- I don't remember how it worked before :)
| I mean it's possible that my previous workflow was:
| 
| 1) build whole kernel by "make"
| 2) modify head_64.S
| 3) run "make arch/x86/kernel/head_64.o"
| 
| So I will try to repeat these 3 points and report.
| 
| 	- Cyrill -

Ok, I just finished building the whole kernel.
And now building this particular single file is
passed fine.

---

cyrill@...ovo linux-2.6.git $ make
...
Root device is (8, 5)
Setup is 11388 bytes (padded to 11776 bytes).
System is 2819 kB
CRC 3cf5b442
Kernel: arch/x86/boot/bzImage is ready  (#13)
  Building modules, stage 2.
  MODPOST 1 modules
  CC      drivers/scsi/scsi_wait_scan.mod.o
  LD [M]  drivers/scsi/scsi_wait_scan.ko
cyrill@...ovo linux-2.6.git $ patch -p1 < patches/x86-remove-balign 
patching file arch/x86/kernel/head_64.S
cyrill@...ovo linux-2.6.git $ make arch/x86/kernel/head_64.o
  CHK     include/linux/version.h
  CHK     include/linux/utsrelease.h
  UPD     include/linux/utsrelease.h
  SYMLINK include/asm -> include/asm-x86
  CALL    scripts/checksyscalls.sh
  CHK     include/linux/compile.h
  CC      init/version.o
  LD      init/built-in.o
  AS      arch/x86/kernel/head_64.o
  VDSOSYM arch/x86/vdso/vdso-syms.lds
  VDSOSYM arch/x86/vdso/vdso32-int80-syms.lds
  VDSOSYM arch/x86/vdso/vdso32-syscall-syms.lds
  VDSOSYM arch/x86/vdso/vdso32-sysenter-syms.lds
  VDSOSYM arch/x86/vdso/vdso32-syms.lds
  LD      arch/x86/vdso/built-in.o
  CC      kernel/trace/trace.o
  LD      kernel/trace/built-in.o
  CC      kernel/module.o
  CC      kernel/kexec.o
  LD      kernel/built-in.o
---

So all builds fine Sam. But frankly I don't understand why
I have to build the whole kernel to be able to compile
head_64.S.

	- Cyrill -
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