linux-kernel - Re: [PATCH 3/3] mm: remove vmalloc

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Message-ID: <50a0372c-8498-4d42-3621-bcde3f2746c8@redhat.com>
Date:   Thu, 18 Jun 2020 10:53:08 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Dexuan Cui <decui@...rosoft.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Jessica Yu <jeyu@...nel.org>,
        x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH 3/3] mm: remove vmalloc_exec

On 18.06.20 08:43, Christoph Hellwig wrote:
> Merge vmalloc_exec into its only caller.  Note that for !CONFIG_MMU
> __vmalloc_node_range maps to __vmalloc, which directly clears the
> __GFP_HIGHMEM added by the vmalloc_exec stub anyway.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  include/linux/vmalloc.h |  1 -
>  kernel/module.c         |  4 +++-
>  mm/nommu.c              | 17 -----------------
>  mm/vmalloc.c            | 20 --------------------
>  4 files changed, 3 insertions(+), 39 deletions(-)
> 
> diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
> index 48bb681e6c2aed..0221f852a7e1a3 100644
> --- a/include/linux/vmalloc.h
> +++ b/include/linux/vmalloc.h
> @@ -106,7 +106,6 @@ extern void *vzalloc(unsigned long size);
>  extern void *vmalloc_user(unsigned long size);
>  extern void *vmalloc_node(unsigned long size, int node);
>  extern void *vzalloc_node(unsigned long size, int node);
> -extern void *vmalloc_exec(unsigned long size);
>  extern void *vmalloc_32(unsigned long size);
>  extern void *vmalloc_32_user(unsigned long size);
>  extern void *__vmalloc(unsigned long size, gfp_t gfp_mask);
> diff --git a/kernel/module.c b/kernel/module.c
> index e8a198588f26ee..0c6573b98c3662 100644
> --- a/kernel/module.c
> +++ b/kernel/module.c
> @@ -2783,7 +2783,9 @@ static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug)
>  
>  void * __weak module_alloc(unsigned long size)
>  {
> -	return vmalloc_exec(size);
> +	return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
> +			GFP_KERNEL, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS,
> +			NUMA_NO_NODE, __func__);
>  }
>  
>  bool __weak module_init_section(const char *name)
> diff --git a/mm/nommu.c b/mm/nommu.c
> index cdcad5d61dd194..f32a69095d509e 100644
> --- a/mm/nommu.c
> +++ b/mm/nommu.c
> @@ -290,23 +290,6 @@ void *vzalloc_node(unsigned long size, int node)
>  }
>  EXPORT_SYMBOL(vzalloc_node);
>  
> -/**
> - *	vmalloc_exec  -  allocate virtually contiguous, executable memory
> - *	@size:		allocation size
> - *
> - *	Kernel-internal function to allocate enough pages to cover @size
> - *	the page level allocator and map them into contiguous and
> - *	executable kernel virtual space.
> - *
> - *	For tight control over page level allocator and protection flags
> - *	use __vmalloc() instead.
> - */
> -
> -void *vmalloc_exec(unsigned long size)
> -{
> -	return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM);
> -}
> -
>  /**
>   * vmalloc_32  -  allocate virtually contiguous memory (32bit addressable)
>   *	@size:		allocation size
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index 3091c2ca60dfd1..f60948aac0d0e4 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -2696,26 +2696,6 @@ void *vzalloc_node(unsigned long size, int node)
>  }
>  EXPORT_SYMBOL(vzalloc_node);
>  
> -/**
> - * vmalloc_exec - allocate virtually contiguous, executable memory
> - * @size:	  allocation size
> - *
> - * Kernel-internal function to allocate enough pages to cover @size
> - * the page level allocator and map them into contiguous and
> - * executable kernel virtual space.
> - *
> - * For tight control over page level allocator and protection flags
> - * use __vmalloc() instead.
> - *
> - * Return: pointer to the allocated memory or %NULL on error
> - */
> -void *vmalloc_exec(unsigned long size)
> -{
> -	return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
> -			GFP_KERNEL, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS,
> -			NUMA_NO_NODE, __builtin_return_address(0));
> -}
> -
>  #if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32)
>  #define GFP_VMALLOC32 (GFP_DMA32 | GFP_KERNEL)
>  #elif defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA)
> 

LGTM

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb