linux-kernel - Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it

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Date:	Mon, 16 May 2016 18:06:05 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Yury Norov <ynorov@...iumnetworks.com>
Cc:	arnd@...db.de, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-s390@...r.kernel.org, pinskia@...il.com,
	Prasun.Kapoor@...iumnetworks.com, heiko.carstens@...ibm.com,
	linux-doc@...r.kernel.org, Nathan_Lynch@...tor.com, agraf@...e.de,
	klimov.linux@...il.com,
	Andrew Pinski <Andrew.Pinski@...iumnetworks.com>,
	broonie@...nel.org, bamvor.zhangjian@...wei.com,
	Andrew Pinski <apinski@...ium.com>, schwab@...e.de,
	schwidefsky@...ibm.com, joseph@...esourcery.com,
	christoph.muellner@...obroma-systems.com
Subject: Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table
 (in entry.S) to use it

On Sat, May 14, 2016 at 06:03:52PM +0300, Yury Norov wrote:
> +SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
> +       unsigned long, prot, unsigned long, flags, unsigned long, fd,
> +       unsigned long, pgoff)

To avoid the types confusion we could add __SC_WRAP to mmap2 in unistd.h
and use COMPAT_SYSCALL_DEFINE6 here (together with compat_ptr_t etc.).

> +{
> +       if (pgoff & (~PAGE_MASK >> 12))
> +               return -EINVAL;
> +
> +       return sys_mmap_pgoff((compat_uptr_t) addr, (compat_size_t) len,
> +		       (int) prot, (int) flags, (int) fd,
> +		       pgoff >> (PAGE_SHIFT-12));

Then we wouldn't need the explicit casting here.

> +}
> +
> +COMPAT_SYSCALL_DEFINE4(pread64, unsigned int, fd, compat_uptr_t __user *, ubuf,
> +		       compat_size_t, count, off_t, offset)
> +{
> +	return sys_pread64(fd, (char *) ubuf, count, offset);
> +}
> +
> +COMPAT_SYSCALL_DEFINE4(pwrite64, unsigned int, fd, compat_uptr_t __user *, ubuf,
> +		       compat_size_t, count, off_t, offset)
> +{
> +	return sys_pwrite64(fd, (char *) ubuf, count, offset);

Nitpick: no space between cast type and variable name: (char *)ubuf, ...

We can also make these functions static as they are not used outside
this file.

-- 
Catalin