linux-kernel - Re: [RFC PATCH 08/28] lkl: system call interface and application API

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Date:	Sun, 08 Nov 2015 00:24:42 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Octavian Purdila <octavian.purdila@...el.com>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	thehajime@...il.com
Subject: Re: [RFC PATCH 08/28] lkl: system call interface and application API

On Tuesday 03 November 2015 22:20:39 Octavian Purdila wrote:
> +
> +/*
> + * Unsupported system calls due to lack of support in LKL (e.g. related to
> + * virtual memory, signal, user processes). We also only support 64bit version
> + * of system calls where we have two version to keep the same APi across 32 and
> + * 64 bit hosts.
> + */
> +#define __NR_restart_syscall 0
> +#define __NR_exit 0
> +#define __NR_fork 0
> +#define __NR_execve 0
> +#define __NR_ptrace 0
> +#define __NR_alarm 0
> +#define __NR_pause 0

Why are these not #undef?

> diff --git a/arch/lkl/include/uapi/asm/unistd.h b/arch/lkl/include/uapi/asm/unistd.h
> new file mode 100644
> index 0000000..68b5423
> --- /dev/null
> +++ b/arch/lkl/include/uapi/asm/unistd.h
> @@ -0,0 +1,256 @@
> +#ifndef _ASM_UAPI_LKL_UNISTD_H
> +#define _ASM_UAPI_LKL_UNISTD_H
> +
> +#ifdef __KERNEL__
> +#define __NR_ni_syscall		0
> +#define __NR_reboot		1
> +#endif
> +#define __NR_getpid		2
> +#define __NR_write		3
> +#define __NR_close		4
> +#define __NR_unlink		5
> +#define __NR_open		6
> +#define __NR_poll		7

Could you use the standard numbers from include/uapi/asm-generic/unistd.h?
Maybe include that header and then #undef the ones you don't support?
That would avoid having to assign a new number of each future syscall
that gets added.

	Arnd
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