linux-kernel - Re: [PATCH] NOMMU: support SMP dynamic percpu

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Message-ID: <4D89F602.5060000@snapgear.com>
Date:	Wed, 23 Mar 2011 23:30:42 +1000
From:	Greg Ungerer <gerg@...pgear.com>
To:	Mike Frysinger <vapier@...too.org>
CC:	<uclinux-dev@...inux.org>, David Howells <dhowells@...hat.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	<uclinux-dist-devel@...ckfin.uclinux.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] NOMMU: support SMP dynamic percpu_alloc

On 23/03/11 06:41, Mike Frysinger wrote:
> From: Graf Yang<graf.yang@...log.com>
>
> The percpu code requires more functions to be implemented in the mm core
> which nommu currently does not provide.  So add inline implementations
> since these are largely meaningless on nommu systems.
>
> Signed-off-by: Graf Yang<graf.yang@...log.com>
> Signed-off-by: Mike Frysinger<vapier@...too.org>

Acked-by: Greg Ungerer <gerg@...inux.org>


> ---
>   include/linux/vmalloc.h |   32 ++++++++++++++++++++++++++++++++
>   1 files changed, 32 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
> index 81f8622..01bbeb4 100644
> --- a/include/linux/vmalloc.h
> +++ b/include/linux/vmalloc.h
> @@ -98,10 +98,27 @@ extern struct vm_struct *remove_vm_area(const void *addr);
>
>   extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
>   			struct page ***pages);
> +#ifdef CONFIG_MMU
>   extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
>   				    pgprot_t prot, struct page **pages);
>   extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
>   extern void unmap_kernel_range(unsigned long addr, unsigned long size);
> +#else
> +static inline int
> +map_kernel_range_noflush(unsigned long start, unsigned long size,
> +			pgprot_t prot, struct page **pages)
> +{
> +	return size>>  PAGE_SHIFT;
> +}
> +static inline void
> +unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
> +{
> +}
> +static inline void
> +unmap_kernel_range(unsigned long addr, unsigned long size)
> +{
> +}
> +#endif
>
>   /* Allocate/destroy a 'vmalloc' VM area. */
>   extern struct vm_struct *alloc_vm_area(size_t size);
> @@ -119,11 +136,26 @@ extern struct vm_struct *vmlist;
>   extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
>
>   #ifdef CONFIG_SMP
> +# ifdef CONFIG_MMU
>   struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
>   				     const size_t *sizes, int nr_vms,
>   				     size_t align);
>
>   void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
> +# else
> +static inline struct vm_struct **
> +pcpu_get_vm_areas(const unsigned long *offsets,
> +		const size_t *sizes, int nr_vms,
> +		size_t align)
> +{
> +	return NULL;
> +}
> +
> +static inline void
> +pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
> +{
> +}
> +# endif
>   #endif
>
>   #endif /* _LINUX_VMALLOC_H */


-- 
------------------------------------------------------------------------
Greg Ungerer  --  Principal Engineer        EMAIL:     gerg@...pgear.com
SnapGear Group, McAfee                      PHONE:       +61 7 3435 2888
8 Gardner Close                             FAX:         +61 7 3217 5323
Milton, QLD, 4064, Australia                WEB: http://www.SnapGear.com
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