linux-kernel - Re: [PATCH 16/17] RISC-V: User-facing API

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Date:   Tue, 11 Jul 2017 06:39:48 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     yamada.masahiro@...ionext.com, mmarek@...e.com,
        will.deacon@....com, peterz@...radead.org, boqun.feng@...il.com,
        mingo@...hat.com, daniel.lezcano@...aro.org, tglx@...utronix.de,
        jason@...edaemon.net, marc.zyngier@....com,
        gregkh@...uxfoundation.org, jslaby@...e.com, davem@...emloft.net,
        mchehab@...nel.org, sfr@...b.auug.org.au, fweisbec@...il.com,
        viro@...iv.linux.org.uk, mcgrof@...nel.org, dledford@...hat.com,
        bart.vanassche@...disk.com, sstabellini@...nel.org,
        daniel.vetter@...ll.ch, mpe@...erman.id.au, msalter@...hat.com,
        nicolas.dichtel@...nd.com, james.hogan@...tec.com,
        paul.gortmaker@...driver.com, linux@...ck-us.net,
        heiko.carstens@...ibm.com, schwidefsky@...ibm.com,
        linux-kernel@...r.kernel.org, patches@...ups.riscv.org,
        akpm@...ux-foundation.org, albert@...ive.com
Subject: Re: [PATCH 16/17] RISC-V: User-facing API

> +++ b/arch/riscv/kernel/sys_riscv.c
> @@ -0,0 +1,43 @@
> +/*
> + * Copyright (C) 2012 Regents of the University of California
> + * Copyright (C) 2014 Darius Rad <darius@...espec.com>
> + * Copyright (C) 2017 SiFive
> + *
> + *   This program is free software; you can redistribute it and/or
> + *   modify it under the terms of the GNU General Public License
> + *   as published by the Free Software Foundation, version 2.
> + *
> + *   This program is distributed in the hope that it will be useful,
> + *   but WITHOUT ANY WARRANTY; without even the implied warranty of
> + *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + *   GNU General Public License for more details.
> + */
> +
> +#include <linux/syscalls.h>
> +#include <asm/cmpxchg.h>

Should not be needed.

> +#ifdef CONFIG_64BIT
> +SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
> +	unsigned long, prot, unsigned long, flags,
> +	unsigned long, fd, off_t, offset)
> +{
> +	if (unlikely(offset & (~PAGE_MASK)))
> +		return -EINVAL;
> +	return sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
> +}
> +#else
> +SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
> +	unsigned long, prot, unsigned long, flags,
> +	unsigned long, fd, off_t, offset)
> +{
> +	/*
> +	 * Note that the shift for mmap2 is constant (12),
> +	 * regardless of PAGE_SIZE
> +	 */
> +	if (unlikely(offset & (~PAGE_MASK >> 12)))
> +		return -EINVAL;
> +	return sys_mmap_pgoff(addr, len, prot, flags, fd,
> +		offset >> (PAGE_SHIFT - 12));
> +}
> +#endif /* !CONFIG_64BIT */

Most modern ports seem to expose sys_mmap_pgoff as the
syscall directly.  Any reason you're doing this differently?

But even the code for the older ones should probably be consolidated..