linux-kernel - Re: [PATCH] sparc32: make copy_to/from_user

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Date:	Wed, 19 Feb 2014 19:50:17 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	paul.gortmaker@...driver.com
Cc:	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sparc32: make copy_to/from_user_page() usable from
 modular code

From: Paul Gortmaker <paul.gortmaker@...driver.com>
Date: Thu, 13 Feb 2014 16:15:01 -0500

> While copy_to/from_user_page() users are uncommon, there is one in
> drivers/staging/lustre/lustre/libcfs/linux/linux-curproc.c which leads
> to the following:
> 
> ERROR: "sparc32_cachetlb_ops" [drivers/staging/lustre/lustre/libcfs/libcfs.ko] undefined!
> 
> during routine allmodconfig build coverage.  The reason this happens
> is as follows:
> 
> In arch/sparc/include/asm/cacheflush_32.h we have:
> 
>  #define flush_cache_page(vma,addr,pfn) \
>         sparc32_cachetlb_ops->cache_page(vma, addr)
> 
>  #define copy_to_user_page(vma, page, vaddr, dst, src, len) \
>         do {                                                    \
>                 flush_cache_page(vma, vaddr, page_to_pfn(page));\
>                 memcpy(dst, src, len);                          \
>         } while (0)
>  #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
>         do {                                                    \
>                 flush_cache_page(vma, vaddr, page_to_pfn(page));\
>                 memcpy(dst, src, len);                          \
>         } while (0)
> 
> However, sparc32_cachetlb_ops isn't exported and hence the error.
> 
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>

Also applied.
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