linux-kernel - Re: [PATCH 05/27] score: create head files cache.h cacheflush.h checksum.h cputime.h current.h

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Date:	Tue, 9 Jun 2009 19:07:16 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	liqin.chen@...plusct.com
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH 05/27] score: create head files cache.h cacheflush.h checksum.h cputime.h current.h

On Tuesday 09 June 2009, liqin.chen@...plusct.com wrote:
> diff --git a/arch/score/include/asm/cacheflush.h 
> b/arch/score/include/asm/cacheflush.h
> +extern void (*flush_cache_all)(void);
> +extern void (*flush_cache_mm)(struct mm_struct *mm);
> +extern void (*flush_cache_range)(struct vm_area_struct *vma,
> +                               unsigned long start, unsigned long end);
> +extern void (*flush_cache_page)(struct vm_area_struct *vma,
> +                               unsigned long page, unsigned long pfn);
> +extern void (*flush_cache_sigtramp)(unsigned long addr);
> +extern void (*flush_icache_all)(void);
> +extern void (*flush_icache_range)(unsigned long start, unsigned long 
> end);
> +extern void (*flush_data_cache_page)(unsigned long addr);

This is a somewhat unusual way to express these functions. It seems
that you only have one implementation for each of them, so I wonder
why you keep them as function pointers. Do you plan to add more CPUs
in the future that do these differently?

> --- /dev/null
> +++ b/arch/score/include/asm/current.h
> @@ -0,0 +1,15 @@
> +#ifndef _ASM_SCORE_CURRENT_H
> +#define _ASM_SCORE_CURRENT_H
> +
> +#include <linux/thread_info.h>
> +
> +struct task_struct;
> +
> +static inline struct task_struct *get_current(void)
> +{
> +       return current_thread_info()->task;
> +}
> +
> +#define current        get_current()
> +
> +#endif /* _ASM_SCORE_CURRENT_H */

This is basically the asm-generic version, so you could just use that
instead.

	Arnd <><
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