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Date: Sat, 14 Jan 2006 16:02:37 -0800
From: Ulrich Drepper <drepper@gmail.com>
To: David Singleton <dsingleton@mvista.com>
Subject: Re: [robust-futex-1] futex: robust futex support
Cc: akpm@osdl.org, linux-kernel@vger.kernel.org, mingo@elte.hu
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On 1/13/06, David Singleton <dsingleton@mvista.com> wrote:
=============================================
> --- linux-2.6.15.orig/include/asm-generic/errno.h
> +++ linux-2.6.15/include/asm-generic/errno.h
> @@ -105,5 +105,6 @@
>  /* for robust mutexes */
>  #define        EOWNERDEAD      130     /* Owner died */
>  #define        ENOTRECOVERABLE 131     /* State not recoverable */
> +#define ENOTSHARED     132     /* no pshared attribute */

Do not introduce a new error code if at all possible.  Adding
userlang-visible error codes means the ABI changes due to the stupid
_sys_errlist variable.  Just reuse an error code which cannot be
returned in the futex code so far and which has some kind of
resemblence with what the error means.