linux-kernel - Re: [PATCH 19/21] fs: Add prototype declaration to header file include/linux/syscalls.h

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Date:	Tue, 11 Feb 2014 14:44:28 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Rashika Kheria <rashika.kheria@...il.com>
Cc:	linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Dario Faggioli <raistlin@...ux.it>,
	Michal Simek <michal.simek@...inx.com>, josh@...htriplett.org
Subject: Re: [PATCH 19/21] fs: Add prototype declaration to header file
 include/linux/syscalls.h

On Sun, 9 Feb 2014 18:58:34 +0530 Rashika Kheria <rashika.kheria@...il.com> wrote:

> Subject: [PATCH 19/21] fs: Add prototype declaration to header file include/linux/syscalls.h

The subjects are pretty meaningless - this really isn't an "fs" patch.

I'll rewrite it to

Subject: include/linux/syscalls.h: add sys32_quotactl() prototype

> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -198,6 +198,11 @@ extern struct trace_event_functions exit_syscall_print_funcs;
>  	}								\
>  	static inline long SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__))
>  
> +#ifdef CONFIG_QUOTACTL_COMPAT
> +asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special,
> +			       qid_t id, void __user *addr);
> +#endif
> +
>  asmlinkage long sys_time(time_t __user *tloc);
>  asmlinkage long sys_stime(time_t __user *tptr);
>  asmlinkage long sys_gettimeofday(struct timeval __user *tv,

Disagree with the ifdefs.  If we were to do this, syscalls.h would
have a tremendous number of ifdefs in it.  Take a look in
kernel/sys_ni.c.

Removing the ifdefs will cause a compile-time error to be deferred to
link time, which will inconvenience a small number of people a small
number of times.  However it will make the code more readable by a
large number of people a large number of times.  It's a good tradeoff.

--- a/include/linux/syscalls.h~include-linux-syscallsh-add-sys32_quotactl-prototype-fix
+++ a/include/linux/syscalls.h
@@ -198,11 +198,8 @@ extern struct trace_event_functions exit
 	}								\
 	static inline long SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__))
 
-#ifdef CONFIG_QUOTACTL_COMPAT
 asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special,
 			       qid_t id, void __user *addr);
-#endif
-
 asmlinkage long sys_time(time_t __user *tloc);
 asmlinkage long sys_stime(time_t __user *tptr);
 asmlinkage long sys_gettimeofday(struct timeval __user *tv,
_

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