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From: Daniel Axtens <dja@axtens.net>
To: Christophe Leroy <christophe.leroy@csgroup.eu>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 01/15] powerpc/uaccess: Remove __get_user_allowed() and unsafe_op_wrap()
Date: Thu, 11 Mar 2021 08:47:42 +1100	[thread overview]
Message-ID: <877dmed6kh.fsf@dja-thinkpad.axtens.net> (raw)
In-Reply-To: <439179c5e54c18f2cb8bdf1eea13ea0ef6b98375.1615398265.git.christophe.leroy@csgroup.eu>

Hi Christophe,

Thanks for the answers to my questions on v1.

This all looks good to me.

Reviewed-by: Daniel Axtens <dja@axtens.net>

Kind regards,
Daniel

> Those two macros have only one user which is unsafe_get_user().
>
> Put everything in one place and remove them.
>
> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
> ---
>  arch/powerpc/include/asm/uaccess.h | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
> index 78e2a3990eab..8cbf3e3874f1 100644
> --- a/arch/powerpc/include/asm/uaccess.h
> +++ b/arch/powerpc/include/asm/uaccess.h
> @@ -53,9 +53,6 @@ static inline bool __access_ok(unsigned long addr, unsigned long size)
>  #define __put_user(x, ptr) \
>  	__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
>  
> -#define __get_user_allowed(x, ptr) \
> -	__get_user_nocheck((x), (ptr), sizeof(*(ptr)), false)
> -
>  #define __get_user_inatomic(x, ptr) \
>  	__get_user_nosleep((x), (ptr), sizeof(*(ptr)))
>  #define __put_user_inatomic(x, ptr) \
> @@ -482,8 +479,11 @@ user_write_access_begin(const void __user *ptr, size_t len)
>  #define user_write_access_begin	user_write_access_begin
>  #define user_write_access_end		prevent_current_write_to_user
>  
> -#define unsafe_op_wrap(op, err) do { if (unlikely(op)) goto err; } while (0)
> -#define unsafe_get_user(x, p, e) unsafe_op_wrap(__get_user_allowed(x, p), e)
> +#define unsafe_get_user(x, p, e) do {					\
> +	if (unlikely(__get_user_nocheck((x), (p), sizeof(*(p)), false)))\
> +		goto e;							\
> +} while (0)
> +
>  #define unsafe_put_user(x, p, e) \
>  	__unsafe_put_user_goto((__typeof__(*(p)))(x), (p), sizeof(*(p)), e)
>  
> -- 
> 2.25.0

  reply	other threads:[~2021-03-10 21:48 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-10 17:46 [PATCH v2 00/15] powerpc: Cleanup of uaccess.h and adding asm goto for get_user() Christophe Leroy
2021-03-10 17:46 ` [PATCH v2 01/15] powerpc/uaccess: Remove __get_user_allowed() and unsafe_op_wrap() Christophe Leroy
2021-03-10 21:47   ` Daniel Axtens [this message]
2021-03-10 17:46 ` [PATCH v2 02/15] powerpc/uaccess: Define ___get_user_instr() for ppc32 Christophe Leroy
2021-03-10 17:46 ` [PATCH v2 03/15] powerpc/align: Convert emulate_spe() to user_access_begin Christophe Leroy
2021-03-10 22:31   ` Daniel Axtens
2021-03-11  5:45     ` Christophe Leroy
2021-03-12 13:25   ` [PATCH v3 " Christophe Leroy
2021-04-10 14:28     ` Michael Ellerman
2021-03-10 17:46 ` [PATCH v2 04/15] powerpc/uaccess: Remove __get/put_user_inatomic() Christophe Leroy
2021-03-10 22:37   ` Daniel Axtens
2021-03-10 17:46 ` [PATCH v2 05/15] powerpc/uaccess: Move get_user_instr helpers in asm/inst.h Christophe Leroy
2021-03-25 21:59   ` Daniel Axtens
2021-03-10 17:46 ` [PATCH v2 06/15] powerpc/align: Don't use __get_user_instr() on kernel addresses Christophe Leroy
2021-03-25 22:12   ` Daniel Axtens
2021-03-10 17:46 ` [PATCH v2 07/15] powerpc/uaccess: Call might_fault() inconditionaly Christophe Leroy
2021-03-25 22:38   ` Daniel Axtens
2021-03-25 22:44     ` Daniel Axtens
2021-03-10 17:46 ` [PATCH v2 08/15] powerpc/uaccess: Remove __unsafe_put_user_goto() Christophe Leroy
2021-03-10 17:46 ` [PATCH v2 09/15] powerpc/uaccess: Remove __chk_user_ptr() in __get/put_user Christophe Leroy
2021-03-10 17:46 ` [PATCH v2 10/15] powerpc/uaccess: Remove calls to __get_user_bad() and __put_user_bad() Christophe Leroy
2021-03-10 17:46 ` [PATCH v2 11/15] powerpc/uaccess: Split out __get_user_nocheck() Christophe Leroy
2021-03-10 17:46 ` [PATCH v2 12/15] powerpc/uaccess: Rename __get/put_user_check/nocheck Christophe Leroy
2021-03-10 17:46 ` [PATCH v2 13/15] powerpc/uaccess: Refactor get/put_user() and __get/put_user() Christophe Leroy
2021-03-10 17:46 ` [PATCH v2 14/15] powerpc/uaccess: Introduce __get_user_size_goto() Christophe Leroy
2021-03-10 17:46 ` [PATCH v2 15/15] powerpc/uaccess: Use asm goto for get_user when compiler supports it Christophe Leroy
2021-04-10 14:28 ` [PATCH v2 00/15] powerpc: Cleanup of uaccess.h and adding asm goto for get_user() Michael Ellerman

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