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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Andrew Morton <akpm@osdl.org>
Subject: Re: 2.6.17-rc1-mm1: mlockall() regression on x86_64
Date: Tue, 4 Apr 2006 22:53:05 +0200
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On Tuesday 04 April 2006 10:45, Andrew Morton wrote:
> 
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.17-rc1/2.6.17-rc1-mm1/

With this kernel mlockall(MCL_CURRENT | MCL_FUTURE) returns -EFAULT if called
by root (unconditionally, it seems) on x86_64.

On my box the output of:

#include <sys/mman.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>

int main()
{
	int ret;

	ret = mlockall(MCL_CURRENT | MCL_FUTURE);
	if (ret < 0)
		printf("%s\n", strerror(errno));

	return 0;
}

is "Bad address", if run by root.

Greetings,
Rafael