linux-kernel - Re: [patch] CFS scheduler, -v8

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Date:	Wed, 2 May 2007 18:41:52 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Vegard Nossum <vegard@...tkore.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch] CFS scheduler, -v8


* Vegard Nossum <vegard@...tkore.net> wrote:

> The sys_sched_yield_to() is not callable from userspace on i386 
> because it is not part of the syscall table 
> (arch/i386/kernel/syscall_table.S). This causes sysenter_entry 
> (arch/i386/kernel/entry.S) to use the wrong count for nr_syscalls (320 
> instead of 321) and return with -ENOSYS.

oops, indeed - the patch below should fix this. (x86 should really adopt 
the nice x86_64 technique of building the syscall table out of the 
unistd.h enumeration definitions.)

	Ingo

Index: linux/arch/i386/kernel/syscall_table.S
===================================================================
--- linux.orig/arch/i386/kernel/syscall_table.S
+++ linux/arch/i386/kernel/syscall_table.S
@@ -319,3 +319,4 @@ ENTRY(sys_call_table)
 	.long sys_move_pages
 	.long sys_getcpu
 	.long sys_epoll_pwait
+	.long sys_sched_yield_to	/* 320 */

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