Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Wed, 16 Feb 2022 19:44:13 +0100
From:   Sam Ravnborg <sam@ravnborg.org>
To:     Arnd Bergmann <arnd@kernel.org>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Christoph Hellwig <hch@lst.de>, linux-arch@vger.kernel.org,
        linux-mm@kvack.org, linux-api@vger.kernel.org, arnd@arndb.de,
        linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk,
        linux@armlinux.org.uk, will@kernel.org, guoren@kernel.org,
        bcain@codeaurora.org, geert@linux-m68k.org, monstr@monstr.eu,
        tsbogend@alpha.franken.de, nickhu@andestech.com,
        green.hu@gmail.com, dinguyen@kernel.org, shorne@gmail.com,
        deller@gmx.de, mpe@ellerman.id.au, peterz@infradead.org,
        mingo@redhat.com, mark.rutland@arm.com, hca@linux.ibm.com,
        dalias@libc.org, davem@davemloft.net, richard@nod.at,
        x86@kernel.org, jcmvbkbc@gmail.com, ebiederm@xmission.com,
        akpm@linux-foundation.org, ardb@kernel.org,
        linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org,
        linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org,
        linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org,
        linux-mips@vger.kernel.org, openrisc@lists.librecores.org,
        linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org,
        linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
        linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org
Subject: Re: [PATCH v2 18/18] uaccess: drop maining CONFIG_SET_FS users
Message-ID: <Yg1F/VT4vRX4aHEt@ravnborg.org>
References: <20220216131332.1489939-1-arnd@kernel.org>
 <20220216131332.1489939-19-arnd@kernel.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20220216131332.1489939-19-arnd@kernel.org>
Precedence: bulk

Hi Arnd,

Fix spelling in $subject...

sparc/Kconfig b/arch/sparc/Kconfig
> index 9f6f9bce5292..9276f321b3e3 100644
> --- a/arch/sparc/Kconfig
> +++ b/arch/sparc/Kconfig
> @@ -46,7 +46,6 @@ config SPARC
>  	select LOCKDEP_SMALL if LOCKDEP
>  	select NEED_DMA_MAP_STATE
>  	select NEED_SG_DMA_LENGTH
> -	select SET_FS
>  	select TRACE_IRQFLAGS_SUPPORT
>  
>  config SPARC32
> @@ -101,6 +100,7 @@ config SPARC64
>  	select HAVE_SETUP_PER_CPU_AREA
>  	select NEED_PER_CPU_EMBED_FIRST_CHUNK
>  	select NEED_PER_CPU_PAGE_FIRST_CHUNK
> +	select SET_FS
This looks wrong - looks like some merge went wrong here.

>  
>  config ARCH_PROC_KCORE_TEXT
>  	def_bool y
> diff --git a/arch/sparc/include/asm/processor_32.h b/arch/sparc/include/asm/processor_32.h
> index 647bf0ac7beb..b26c35336b51 100644
> --- a/arch/sparc/include/asm/processor_32.h
> +++ b/arch/sparc/include/asm/processor_32.h
> @@ -32,10 +32,6 @@ struct fpq {
>  };
>  #endif
>  
> -typedef struct {
> -	int seg;
> -} mm_segment_t;
> -
>  /* The Sparc processor specific thread struct. */
>  struct thread_struct {
>  	struct pt_regs *kregs;
> @@ -50,11 +46,9 @@ struct thread_struct {
>  	unsigned long   fsr;
>  	unsigned long   fpqdepth;
>  	struct fpq	fpqueue[16];
> -	mm_segment_t current_ds;
>  };
>  
>  #define INIT_THREAD  { \
> -	.current_ds = KERNEL_DS, \
>  	.kregs = (struct pt_regs *)(init_stack+THREAD_SIZE)-1 \
>  }
>  
> diff --git a/arch/sparc/include/asm/uaccess_32.h b/arch/sparc/include/asm/uaccess_32.h
> index 367747116260..9fd6c53644b6 100644
> --- a/arch/sparc/include/asm/uaccess_32.h
> +++ b/arch/sparc/include/asm/uaccess_32.h
> @@ -12,19 +12,6 @@
>  #include <linux/string.h>
>  
>  #include <asm/processor.h>
> -
> -/* Sparc is not segmented, however we need to be able to fool access_ok()
> - * when doing system calls from kernel mode legitimately.
> - *
> - * "For historical reasons, these macros are grossly misnamed." -Linus
> - */
> -
> -#define KERNEL_DS   ((mm_segment_t) { 0 })
> -#define USER_DS     ((mm_segment_t) { -1 })
> -
> -#define get_fs()	(current->thread.current_ds)
> -#define set_fs(val)	((current->thread.current_ds) = (val))
> -
>  #include <asm-generic/access_ok.h>
>  
>  /* Uh, these should become the main single-value transfer routines..
> diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c
> index 2dc0bf9fe62e..88c0c14aaff0 100644
> --- a/arch/sparc/kernel/process_32.c
> +++ b/arch/sparc/kernel/process_32.c
> @@ -300,7 +300,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long arg,
>  		extern int nwindows;
>  		unsigned long psr;
>  		memset(new_stack, 0, STACKFRAME_SZ + TRACEREG_SZ);
> -		p->thread.current_ds = KERNEL_DS;
>  		ti->kpc = (((unsigned long) ret_from_kernel_thread) - 0x8);
>  		childregs->u_regs[UREG_G1] = sp; /* function */
>  		childregs->u_regs[UREG_G2] = arg;
> @@ -311,7 +310,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long arg,
>  	}
>  	memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
>  	childregs->u_regs[UREG_FP] = sp;
> -	p->thread.current_ds = USER_DS;
>  	ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
>  	ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
>  	ti->kwim = current->thread.fork_kwim;

Other than the above the sparc32 changes looks fine, and with the Kconf
stuff fixed:
Acked-by: Sam Ravnborg <sam@ravnborg.org> # for sparc32 changes