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

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Message-ID: <CAMuHMdUNvSahqcHPo9eO44d6opQXTvQq_HbUbFM2qhXTOj7LJQ@mail.gmail.com>
Date:	Wed, 26 Mar 2014 09:41:23 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	sparclinux <sparclinux@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sparc32: make copy_to/from_user_page() usable from
 modular code

On Thu, Feb 13, 2014 at 10:15 PM, Paul Gortmaker
<paul.gortmaker@...driver.com> wrote:
> 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>

Sorry for only noticing now. A similar fix for pa-risc was reverted:

"Christoph Hellwig <hch@...radead.org> commented:
 This one shouldn't go in - Geert sent it a bit prematurely, as Lustre
 shouldn't use it just to reimplement core VM functionality (which it
 shouldn't use either, but that's a separate story)."

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a446e72bc15c7bfd2c953e56064ace3566c79b0e

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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