linux-kernel - Re: dmsetup fails on latest kernel

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Message-ID: <CA+55aFwwkjFsVuSZWgasN4e_d9suRV4Afr94NMvNt4R7Ej0gbw@mail.gmail.com>
Date:	Thu, 19 Jan 2012 11:05:41 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Kasatkin, Dmitry" <dmitry.kasatkin@...el.com>
Cc:	device-mapper development <dm-devel@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: dmsetup fails on latest kernel

On Thu, Jan 19, 2012 at 7:56 AM, Kasatkin, Dmitry
<dmitry.kasatkin@...el.com> wrote:
> On Thu, Jan 19, 2012 at 3:02 PM, Kasatkin, Dmitry
> <dmitry.kasatkin@...el.com> wrote:
>> Hi,
>>
>> (subject added)
>>
>> I rebased on the stop of latest mainline tree and now dmsetup fails...
>> It says: "Failed to create notification semaphore: Function not implemented".
>> I run strace and saw that dmsetup uses "semget" which returns -ENOSYS...
>>
>> It works on
>> 122804ecb59493fbb4d31b3ba9ac59faaf45276f
>>
>> but does not work on
>> ccb19d263fd1c9e34948e2158c53eacbff369344
>>
>> Any ideas?
>>
>> - Dmitry
>
> Hi,
>
> I have bisected the problem...
>
> It is introduced by this commit:
>
> 303395ac3bf3e2cb488435537d416bc840438fcb is the first bad commit
> commit 303395ac3bf3e2cb488435537d416bc840438fcb
> Author: H. Peter Anvin <hpa@...ux.intel.com>
> Date:   Fri Nov 11 16:07:41 2011 -0800
>
>    x86: Generate system call tables and unistd_*.h from tables

Interesting. I just munged the old pre-merge

  arch/x86/kernel/syscall_table_32.S

and the new

  arch/x86/syscalls/syscall_32.tbl

with some trivial shell scripting, and they are definitely identical.

So the tables look like they match 1:1.

The compat tables match too, except the new list contains the entry
for bdflush (134), but that's a legacy thing that doesn't matter.

I wonder what else could be going on. Wrong number of system calls
check? Peter, any ideas?

                        Linus
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