[uml-devel] Compiling SMP support in UML

[<r1s...@in...>]

I was trying to compile UML with SMP defined. There is a file
(arch/um/drivers/ubd.c) which causes a compile error. It has a

#ifdef CONFIG_SMP
#error end_request needs some locking
#endif

compiler directive. Has any fixed this? If so can I have a copy of ubd.=
c?

Thanks,
vatsa



Please respond to Jeff Dike <jd...@ka...>

To: =A0 =A0 =A0 =A0Brian Ristuccia <br...@ri...>
cc: =A0 =A0 =A0 =A0l...@vg...,
use...@li..., Alex Pennace
<al...@os...>, Dennis Ristuccia <de...@os...> (bcc: V=

Srivatsa/India/IBM)
Subject: =A0 =A0 =A0 =A0Re: [uml-devel] usermode linux hoses 2.2.18-SMP=
 host
machine when run =A0from regular user account



[IMAGE]
br...@ri... said:
> When run from a normal user account with its current working director=
y
> on a NFS filesystem, usermode linux causes the host machine's kernel
> to enter a hosed state. No processes (including UML) seem to respond,=

> and the machine becomes unusable.

Just to clarify what I think UML is doing that's causing the trouble: i=
t is
an
extensive user of mmap. =A0It creates several files (one 16 meg by defa=
ult,
but
possibly much larger) in $PWD, and mmaps them into all of its threads. =
=A0The
"physical memory" file also has individual pages mapped twice (or more)=

into
various threads.

I've seen this confuse an old version of reiserfs and NFS, although not=
 so
much that the machine hung. =A0UML would just see stale data, get horri=
bly
confused by it, and crash.

=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Jeff



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