linux-kernel - Re: [PATCH 11/15] binfmt_flat: provide an asm-generic/flat.h

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Date:   Tue, 11 Jun 2019 11:01:48 +0100
From:   Vladimir Murzin <vladimir.murzin@....com>
To:     Christoph Hellwig <hch@....de>, Greg Ungerer <gerg@...ux-m68k.org>
Cc:     uclinux-h8-devel@...ts.sourceforge.jp,
        linux-xtensa@...ux-xtensa.org, Michal Simek <monstr@...str.eu>,
        linux-c6x-dev@...ux-c6x.org, linux-sh@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-riscv@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 11/15] binfmt_flat: provide an asm-generic/flat.h

On 6/10/19 10:20 PM, Christoph Hellwig wrote:
> This file implements the flat get/put reloc helpers for architectures
> that do not need to overload the relocs by simply using get_user/put_user.
> 
> Note that many nommu architectures currently use {get,put}_unaligned, which
> looks a little bogus and should probably later be switched over to this
> version as well.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  arch/arm/include/asm/Kbuild                   |  1 +
>  arch/m68k/include/asm/flat.h                  | 21 +------------------
>  .../asm => include/asm-generic}/flat.h        | 12 ++++-------
>  3 files changed, 6 insertions(+), 28 deletions(-)
>  rename {arch/arm/include/asm => include/asm-generic}/flat.h (73%)

FWIW:

Reviewed-by: Vladimir Murzin <vladimir.murzin@....com>

> 
> diff --git a/arch/arm/include/asm/Kbuild b/arch/arm/include/asm/Kbuild
> index a8f149ab45b8..6b2dc15b6dff 100644
> --- a/arch/arm/include/asm/Kbuild
> +++ b/arch/arm/include/asm/Kbuild
> @@ -5,6 +5,7 @@ generic-y += early_ioremap.h
>  generic-y += emergency-restart.h
>  generic-y += exec.h
>  generic-y += extable.h
> +generic-y += flat.h
>  generic-y += irq_regs.h
>  generic-y += kdebug.h
>  generic-y += local.h
> diff --git a/arch/m68k/include/asm/flat.h b/arch/m68k/include/asm/flat.h
> index d7102fcd43eb..46379e08cdd6 100644
> --- a/arch/m68k/include/asm/flat.h
> +++ b/arch/m68k/include/asm/flat.h
> @@ -6,26 +6,7 @@
>  #ifndef __M68KNOMMU_FLAT_H__
>  #define __M68KNOMMU_FLAT_H__
>  
> -#include <linux/uaccess.h>
> -
> -static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
> -					u32 *addr, u32 *persistent)
> -{
> -#ifdef CONFIG_CPU_HAS_NO_UNALIGNED
> -	return copy_from_user(addr, rp, 4) ? -EFAULT : 0;
> -#else
> -	return get_user(*addr, rp);
> -#endif
> -}
> -
> -static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
> -{
> -#ifdef CONFIG_CPU_HAS_NO_UNALIGNED
> -	return copy_to_user(rp, &addr, 4) ? -EFAULT : 0;
> -#else
> -	return put_user(addr, rp);
> -#endif
> -}
> +#include <asm-generic/flat.h>
>  
>  #define FLAT_PLAT_INIT(regs) \
>  	do { \
> diff --git a/arch/arm/include/asm/flat.h b/include/asm-generic/flat.h
> similarity index 73%
> rename from arch/arm/include/asm/flat.h
> rename to include/asm-generic/flat.h
> index bbc27901446f..fcd2b45c0735 100644
> --- a/arch/arm/include/asm/flat.h
> +++ b/include/asm-generic/flat.h
> @@ -1,15 +1,11 @@
>  /* SPDX-License-Identifier: GPL-2.0 */
> -/*
> - * arch/arm/include/asm/flat.h -- uClinux flat-format executables
> - */
> -
> -#ifndef __ARM_FLAT_H__
> -#define __ARM_FLAT_H__
> +#ifndef _ASM_GENERIC_FLAT_H
> +#define _ASM_GENERIC_FLAT_H
>  
>  #include <linux/uaccess.h>
>  
>  static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
> -					u32 *addr, u32 *persistent)
> +		u32 *addr, u32 *persistent)
>  {
>  #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
>  	return copy_from_user(addr, rp, 4) ? -EFAULT : 0;
> @@ -27,4 +23,4 @@ static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
>  #endif
>  }
>  
> -#endif /* __ARM_FLAT_H__ */
> +#endif /* _ASM_GENERIC_FLAT_H */
>