linux-kernel - Re: [PATCH] include/linux/compiler.h: unconditionally define _

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Date:	Tue, 07 Jul 2015 09:45:29 -0600
From:	Ross Zwisler <ross.zwisler@...ux.intel.com>
To:	Nicolai Stange <nicstange@...il.com>
Cc:	Christopher Li <sparse@...isli.org>, linux-sparse@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] include/linux/compiler.h: unconditionally define __pmem
 sparse attribute

On Tue, 2015-07-07 at 17:41 +0200, Nicolai Stange wrote:
> Commit 61031952f4c8 ("arch, x86: pmem api for ensuring durability of
>                       persistent memory updates")
> defined __pmem in include/linux/compiler.h only for the case
> CONFIG_RCU_SPARSE_POINTER=n, probably by accident.
> 
> With CONFIG_RCU_SPARSE_POINTER=y a sparse compile gives the error:
>   CHECK   init/main.c
>   arch/x86/include/asm/io.h:251:27: error: void declaration
>   arch/x86/include/asm/io.h:251:27: error: Expected ; at end of declaration
>   arch/x86/include/asm/io.h:251:27: error: got *
>   arch/x86/include/asm/io.h:255:1: error: Expected ; at the end of
>     type declaration
>   arch/x86/include/asm/io.h:255:1: error: got }
> 
> This happens because the __pmem in
> arch/x86/include/asm/io.h:251:
>   static inline void __pmem *arch_memremap_pmem([...])
> is undefined.
> 
> Define __pmem unconditionally in include/linux/compiler.h.
> 
> Signed-off-by: Nicolai Stange <nicstange@...il.com>
> ---
>  include/linux/compiler.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/compiler.h b/include/linux/compiler.h
> index 7f8ad95..4f85b58 100644
> --- a/include/linux/compiler.h
> +++ b/include/linux/compiler.h
> @@ -21,8 +21,8 @@
>  # define __rcu		__attribute__((noderef, address_space(4)))
>  #else
>  # define __rcu
> -# define __pmem		__attribute__((noderef, address_space(5)))
>  #endif
> +# define __pmem		__attribute__((noderef, address_space(5)))
>  extern void __chk_user_ptr(const volatile void __user *);
>  extern void __chk_io_ptr(const volatile void __iomem *);
>  #else

Yep, thank you for the fix.  I think Dan already has a version of this queued
up in his tree for his next pull request:

https://git.kernel.org/cgit/linux/kernel/git/djbw/nvdimm.git/commit/?h=libnvdimm-pending&id=31f02455455d405320e2f749696bef4e02903b35


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