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:	Tue, 26 Apr 2016 17:57:01 +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, schwab@...e.de,
	broonie@...nel.org, linux-doc@...r.kernel.org,
	heiko.carstens@...ibm.com, agraf@...e.de, klimov.linux@...il.com,
	Andrew Pinski <Andrew.Pinski@...iumnetworks.com>,
	bamvor.zhangjian@...wei.com, Andrew Pinski <apinski@...ium.com>,
	schwidefsky@...ibm.com, Nathan_Lynch@...tor.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 Wed, Apr 06, 2016 at 01:08:42AM +0300, Yury Norov wrote:
> +/* Using non-compat syscalls where necessary */
> +#define compat_sys_fadvise64_64        sys_fadvise64_64
> +#define compat_sys_fallocate           sys_fallocate
> +#define compat_sys_ftruncate64         sys_ftruncate
> +#define compat_sys_lookup_dcookie      sys_lookup_dcookie
> +#define compat_sys_pread64             sys_pread64
> +#define compat_sys_pwrite64            sys_pwrite64
> +#define compat_sys_readahead           sys_readahead
> +#define compat_sys_shmat               sys_shmat

Why don't we use compat_sys_shmat? Is it because of COMPAT_SHMLBA?

> +#define compat_sys_sync_file_range     sys_sync_file_range
> +#define compat_sys_truncate64          sys_truncate
> +#define sys_llseek                     sys_lseek
> +#define sys_mmap2		       sys_mmap

Nitpick: there are some whitespace inconsistencies above (just convert
all spaces to tabs).

I think you should also update Documentation/arm64/ilp32.txt to include
the list above.

> +
> +#include <asm/syscall.h>
> +
> +#undef __SYSCALL
> +#undef __SC_COMP
> +#undef __SC_WRAP
> +#undef __SC_3264
> +#undef __SC_COMP_3264

Minor detail: do we actually need to undef all these? Maybe we can get
away with just defining __SYSCALL_COMPAT at the top of the file.

> +
> +#define __SYSCALL_COMPAT
> +#define __SYSCALL(nr, sym)	[nr] = sym,
> +#define __SC_WRAP(nr, sym)	[nr] = compat_##sym,
> +
> +/*
> + * The sys_call_ilp32_table array must be 4K aligned to be accessible from
> + * kernel/entry.S.
> + */
> +void *sys_call_ilp32_table[__NR_syscalls] __aligned(4096) = {
> +	[0 ... __NR_syscalls - 1] = sys_ni_syscall,
> +#include <asm/unistd.h>
> +};

-- 
Catalin