linux-kernel - Re: microblaze syscall list

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Date:	Sun, 04 May 2008 15:09:55 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	monstr@...nam.cz
CC:	Arnd Bergmann <arnd@...db.de>, microblaze-uclinux@...e.uq.edu.au,
	Matthew Wilcox <matthew@....cx>,
	Will Newton <will.newton@...il.com>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org, git@...inx.com,
	John Williams <john.williams@...alogix.com>,
	Stephen Neuendorffer <stephen.neuendorffer@...inx.com>,
	John Linn <John.Linn@...inx.com>
Subject: Re: microblaze syscall list

Michal Simek wrote:
> /* fs/select.c */
> 	.long sys_select /* obsolete -> sys_pselect6 */
> ok	.long sys_pselect7
> 	.long sys_pselect6 /* obsolete -> sys_pselect7 */

I thought there was some semantic differences between select() and 
pselect()... perhaps those changes have been removed?

> 
> /* kernel/sys_ni.c */
> 	.long sys_ni_syscall /*  :-)  */
> 

There is a school of thought that it's useful to reserve a system call 
number (usually zero) as a system call that is *guaranteed* to have no 
effect.

> /* arch - microblaze specific */
> /* arch/microblaze/kernel/signal.c */
> 	.long sys_sigreturn /* obsolete -> sys_rt_sigreturn */
> ok	.long sys_rt_sigreturn_wrapper /*.long sys_rt_sigreturn*/
> 	.long sys_sigaction /* obsolete -> rt_sigaction */
> 	.long sys_sigsuspend /* obsolete -> rt_sigsuspend */

Btw, please implement rt_sigreturn sanely; on x86, for example, one has 
to pop a word off the stack before one can invoke the system call, when 
used as sa_restorer...

	-hpa

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