linux-kernel - Re: [dm-devel] dmsetup fails on latest kernel

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Date:	Thu, 19 Jan 2012 18:06:52 +0000
From:	"Bryn M. Reeves" <bmr@...hat.com>
To:	device-mapper development <dm-devel@...hat.com>
CC:	"Kasatkin, Dmitry" <dmitry.kasatkin@...el.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [dm-devel] dmsetup fails on latest kernel

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On 01/19/2012 04:10 PM, Kasatkin, Dmitry wrote:
> It seems "semget" is missing from:
> arch/x86/syscalls/syscall_32.tbl But it presents in:
> arch/x86/syscalls/syscall_64.tbl
> 
> Is it a bug then?

Maybe; I noticed that too but it's also missing in the old x86
unistd_32.h.

I thought Linux only provided the ipc(2) call - glibc sources seem to
confirm that (sysdeps/unix/sysv/linux/semget.c).

sys_sem* and friends are present in include/asm-generic/unistd.h so
maybe these values just need to be propagated to syscall_32.tbl?

Actually there's a bunch of SysV IPC calls defined in syscall_64.tbl
that are not present in syscall_32.tbl:

$ egrep 'shm|sem|msg[a-z]' arch/x86/syscalls/syscall_32.tbl
$ egrep 'shm|sem|msg[a-z]' arch/x86/syscalls/syscall_64.tbl
29	64	shmget			sys_shmget
30	64	shmat			sys_shmat
31	64	shmctl			sys_shmctl
64	64	semget			sys_semget
65	64	semop			sys_semop
66	64	semctl			sys_semctl
67	64	shmdt			sys_shmdt
68	64	msgget			sys_msgget
69	64	msgsnd			sys_msgsnd
70	64	msgrcv			sys_msgrcv
71	64	msgctl			sys_msgctl
220	64	semtimedop		sys_semtimedop

But sys_ipc is there:

$ grep sys_ipc arch/x86/syscalls/syscall_32.tbl
117	i386	ipc			sys_ipc				sys32_ipc

Regards,
Bryn.
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