Re: 2.6.17-rc1-mm1: mlockall() regression on x86_64

[Andrew Morton <akpm@osdl.org>]

"Rafael J. Wysocki" <rjw@sisk.pl> wrote:
>
> 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.
> 

Yes, me too.  It works OK on x86_32.

It's due to mm-posix-memory-lock.patch.  I'd guess that
make_pages_present() is returning -EFAULT for some reason.

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