linux-kernel - Re: [PATCH 28/44] Add translate

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Date:	Tue, 4 Mar 2014 19:41:09 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Richard Weinberger <richard@....at>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	viro@...iv.linux.org.uk, vgupta@...opsys.com,
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	tj@...nel.org, hch@...radead.org
Subject: Re: [PATCH 28/44] Add translate_signal() helper

On 03/03, Richard Weinberger wrote:
>
> +static inline int translate_signal(int sig)
> +{
> +	struct thread_info *info = current_thread_info();
> +
> +	if (info->exec_domain

Afaics it can't be NULL.

> && info->exec_domain->signal_invmap && sig < 32)
> +		return info->exec_domain->signal_invmap[sig];
> +

And why default_exec_domain has .signal_invmap = ident_map ?
translate_signal-like code should check ->signal_invmap != NULL
anyway.

Off topic, but can't we kill exec_domain->signal_map ? it seems that
it is unused.

Hmm. And who actually uses exec_domain->handler() ?? asm-offsets.c,
but I do not see any usage of TI_EXEC_DOMAIN.

In short: I agree with this change but I am totally confused. To the
point, I am not sure I even understand ->signal_invmap. I mean, it
seems that only arthur_exec_domain has a non-ident map. Why, say,
x86 does signr_convert() ? and only if CONFIG_X86_32? Is there any
external module which does register_exec_domain(strange_invmap) ?

Oleg.

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