linux-kernel - Re: [PATCH 2/6] m32r: Define THREAD

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Message-id: <swf3a6zjo84.wl%takata.hirokazu@renesas.com>
Date:	Mon, 07 Sep 2009 14:52:27 +0900
From:	Hirokazu Takata <takata@...ux-m32r.org>
To:	Tim Abbott <tabbott@...lice.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Hirokazu Takata <takata@...ux-m32r.org>
Subject: Re: [PATCH 2/6] m32r: Define THREAD_SIZE only once.

Hello,

From: Tim Abbott <tabbott@...lice.com>
Subject: [PATCH 2/6] m32r: Define THREAD_SIZE only once.
Date: Sun, 06 Sep 2009 23:12:55 -0400
> Previously, m32r's asm/thread_info.h defined THREAD_SIZE differently
> for assembly and C code; now that PAGE_SIZE is usable from assembly,
> these can be combined.  Also, m32r's asm/processor.h redefines
> THREAD_SIZE to the same value; remove this redundant definition.
> 
> Signed-off-by: Tim Abbott <tabbott@...lice.com>
> Cc: Hirokazu Takata <takata@...ux-m32r.org>
> ---
>  arch/m32r/include/asm/processor.h   |    2 --
>  arch/m32r/include/asm/thread_info.h |    6 ++----
>  2 files changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/m32r/include/asm/processor.h b/arch/m32r/include/asm/processor.h
> index 1a997fc..8397c24 100644
> --- a/arch/m32r/include/asm/processor.h
> +++ b/arch/m32r/include/asm/processor.h
> @@ -140,8 +140,6 @@ unsigned long get_wchan(struct task_struct *p);
>  #define KSTK_EIP(tsk)  ((tsk)->thread.lr)
>  #define KSTK_ESP(tsk)  ((tsk)->thread.sp)
>  
> -#define THREAD_SIZE (2*PAGE_SIZE)
> -
>  #define cpu_relax()	barrier()
>  
>  #endif /* _ASM_M32R_PROCESSOR_H */
> diff --git a/arch/m32r/include/asm/thread_info.h b/arch/m32r/include/asm/thread_info.h
> index 07bb5bd..787ac92 100644
> --- a/arch/m32r/include/asm/thread_info.h
> +++ b/arch/m32r/include/asm/thread_info.h
> @@ -55,6 +55,8 @@ struct thread_info {
>  
>  #define PREEMPT_ACTIVE		0x10000000
>  
> +#define THREAD_SIZE (PAGE_SIZE << 1)
> +
>  /*
>   * macros/functions for gaining access to the thread information structure
>   */
> @@ -76,8 +78,6 @@ struct thread_info {
>  #define init_thread_info	(init_thread_union.thread_info)
>  #define init_stack		(init_thread_union.stack)
>  
> -#define THREAD_SIZE (2*PAGE_SIZE)
> -
>  /* how to get the thread information struct from C */
>  static inline struct thread_info *current_thread_info(void)
>  {
> @@ -127,8 +127,6 @@ static inline unsigned int get_thread_fault_code(void)
>  
>  #else /* !__ASSEMBLY__ */
>  
> -#define THREAD_SIZE	8192
> -
>  /* how to get the thread information struct from ASM */
>  #define GET_THREAD_INFO(reg)	GET_THREAD_INFO reg
>  	.macro GET_THREAD_INFO reg
> -- 
> 1.6.3.3
> 

This patch causes build errors:

$ m32r-linux-gnu-gcc -Wp,-MD,arch/m32r/kernel/.entry.o.d  -nostdinc -isystem /usr/lib/gcc/m32r-linux-gnu/4.1.2/include -Iinclude -Iinclude2 -I/project/m32r-linux/kernel/dev/linux-2.6_dev.git/include -I/project/m32r-linux/kernel/dev/linux-2.6_dev.git/arch/m32r/include -include include/linux/autoconf.h -D__KERNEL__ -D__ASSEMBLY__ -DNO_FPU -m32r2 -O2  -c -o arch/m32r/kernel/entry.o /project/m32r-linux/kernel/dev/linux-2.6_dev.git/arch/m32r/kernel/entry.S
/project/m32r-linux/kernel/dev/linux-2.6_dev.git/arch/m32r/kernel/entry.S: Assembler messages:
/project/m32r-linux/kernel/dev/linux-2.6_dev.git/arch/m32r/kernel/entry.S:124: Error: undefined symbol `PAGE_SIZE' in operation
/project/m32r-linux/kernel/dev/linux-2.6_dev.git/arch/m32r/kernel/entry.S:150: Error: undefined symbol `PAGE_SIZE' in operation
/project/m32r-linux/kernel/dev/linux-2.6_dev.git/arch/m32r/kernel/entry.S:159: Error: undefined symbol `PAGE_SIZE' in operation
/project/m32r-linux/kernel/dev/linux-2.6_dev.git/arch/m32r/kernel/entry.S:189: Error: undefined symbol `PAGE_SIZE' in operation
/project/m32r-linux/kernel/dev/linux-2.6_dev.git/arch/m32r/kernel/entry.S:268: Error: undefined symbol `PAGE_SIZE' in operation

It is because entry.s still has PAGE_SIZE symbol, after C preprocessing:

--- arch/m32r/kernel/entry.S ---
 :
121 ENTRY(ret_from_fork)
122         pop     r0
123         bl      schedule_tail
124         GET_THREAD_INFO(r8)
125         bra     syscall_exit
 :
---

--- entry.s (preprocessed entry.S) ---
# 132 "/project/m32r-linux/kernel/dev/linux-2.6_dev.git/arch/m32r/include/asm/th
read_info.h"
 .macro GET_THREAD_INFO reg
 ldi \reg, #-(PAGE_SIZE << 1)
 and \reg, sp
 .endm

  :

# 121 "/project/m32r-linux/kernel/dev/linux-2.6_dev.git/arch/m32r/kernel/ent    ry.S"
ENTRY_M ret_from_fork
 pop r0
 bl schedule_tail
 GET_THREAD_INFO r8
 bra syscall_exit
---


The PAGE_SIZE symbol is defined in asm/page.h, So I think asm/page.h
should be included at the top of asm/thread-info.h.
Here is a additional patch:

--- a/arch/m32r/include/asm/thread_info.h
+++ b/arch/m32r/include/asm/thread_info.h
@@ -10,6 +10,7 @@

 #ifdef __KERNEL__

+#include <asm/page.h>
 #ifndef __ASSEMBLY__
 #include <asm/processor.h>
 #endif

Signed-off-by: Hirokazu Takata <takata@...ux-m32r.org>


Please update your patch if possible.

Thank you.

-- Takata
--
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