linux-kernel - Re: [PATCH v6 1/8] mm: vmalloc: group declarations depending on CONFIG

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Message-ID: <Zw_QfzopOv7pCZc_@pc636>
Date: Wed, 16 Oct 2024 16:41:03 +0200
From: Uladzislau Rezki <urezki@...il.com>
To: Mike Rapoport <rppt@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
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	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v6 1/8] mm: vmalloc: group declarations depending on
 CONFIG_MMU together

On Wed, Oct 16, 2024 at 03:24:17PM +0300, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
> 
> There are a couple of declarations that depend on CONFIG_MMU in
> include/linux/vmalloc.h spread all over the file.
> 
> Group them all together to improve code readability.
> 
> No functional changes.
> 
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
> Reviewed-by: Christoph Hellwig <hch@....de>
> ---
>  include/linux/vmalloc.h | 60 +++++++++++++++++------------------------
>  1 file changed, 24 insertions(+), 36 deletions(-)
> 
> diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
> index ad2ce7a6ab7a..27408f21e501 100644
> --- a/include/linux/vmalloc.h
> +++ b/include/linux/vmalloc.h
> @@ -134,12 +134,6 @@ extern void vm_unmap_ram(const void *mem, unsigned int count);
>  extern void *vm_map_ram(struct page **pages, unsigned int count, int node);
>  extern void vm_unmap_aliases(void);
>  
> -#ifdef CONFIG_MMU
> -extern unsigned long vmalloc_nr_pages(void);
> -#else
> -static inline unsigned long vmalloc_nr_pages(void) { return 0; }
> -#endif
> -
>  extern void *vmalloc_noprof(unsigned long size) __alloc_size(1);
>  #define vmalloc(...)		alloc_hooks(vmalloc_noprof(__VA_ARGS__))
>  
> @@ -266,12 +260,29 @@ static inline bool is_vm_area_hugepages(const void *addr)
>  #endif
>  }
>  
> +/* for /proc/kcore */
> +long vread_iter(struct iov_iter *iter, const char *addr, size_t count);
> +
> +/*
> + *	Internals.  Don't use..
> + */
> +__init void vm_area_add_early(struct vm_struct *vm);
> +__init void vm_area_register_early(struct vm_struct *vm, size_t align);
> +
> +int register_vmap_purge_notifier(struct notifier_block *nb);
> +int unregister_vmap_purge_notifier(struct notifier_block *nb);
> +
>  #ifdef CONFIG_MMU
> +#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
> +
> +unsigned long vmalloc_nr_pages(void);
> +
>  int vm_area_map_pages(struct vm_struct *area, unsigned long start,
>  		      unsigned long end, struct page **pages);
>  void vm_area_unmap_pages(struct vm_struct *area, unsigned long start,
>  			 unsigned long end);
>  void vunmap_range(unsigned long addr, unsigned long end);
> +
>  static inline void set_vm_flush_reset_perms(void *addr)
>  {
>  	struct vm_struct *vm = find_vm_area(addr);
> @@ -279,24 +290,14 @@ static inline void set_vm_flush_reset_perms(void *addr)
>  	if (vm)
>  		vm->flags |= VM_FLUSH_RESET_PERMS;
>  }
> +#else  /* !CONFIG_MMU */
> +#define VMALLOC_TOTAL 0UL
>  
> -#else
> -static inline void set_vm_flush_reset_perms(void *addr)
> -{
> -}
> -#endif
> -
> -/* for /proc/kcore */
> -extern long vread_iter(struct iov_iter *iter, const char *addr, size_t count);
> -
> -/*
> - *	Internals.  Don't use..
> - */
> -extern __init void vm_area_add_early(struct vm_struct *vm);
> -extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
> +static inline unsigned long vmalloc_nr_pages(void) { return 0; }
> +static inline void set_vm_flush_reset_perms(void *addr) {}
> +#endif /* CONFIG_MMU */
>  
> -#ifdef CONFIG_SMP
> -# ifdef CONFIG_MMU
> +#if defined(CONFIG_MMU) && defined(CONFIG_SMP)
>  struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
>  				     const size_t *sizes, int nr_vms,
>  				     size_t align);
> @@ -311,22 +312,9 @@ pcpu_get_vm_areas(const unsigned long *offsets,
>  	return NULL;
>  }
>  
> -static inline void
> -pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
> -{
> -}
> -# endif
> -#endif
> -
> -#ifdef CONFIG_MMU
> -#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
> -#else
> -#define VMALLOC_TOTAL 0UL
> +static inline void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) {}
>  #endif
>  
> -int register_vmap_purge_notifier(struct notifier_block *nb);
> -int unregister_vmap_purge_notifier(struct notifier_block *nb);
> -
>  #if defined(CONFIG_MMU) && defined(CONFIG_PRINTK)
>  bool vmalloc_dump_obj(void *object);
>  #else
> -- 
> 2.43.0
> 
Reviewed-by: Uladzislau Rezki (Sony) <urezki@...il.com>

--
Uladzislau Rezki