linux-kernel - Re: [PATCH 4/5] uprobes/x86: Make good_insns_* depend on CONFIG_X86

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Message-ID: <20140429100611.GD3269@linux.vnet.ibm.com>
Date:	Tue, 29 Apr 2014 15:36:11 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <aarapov@...hat.com>,
	David Long <dave.long@...aro.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	Jonathan Lebon <jlebon@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] uprobes/x86: Make good_insns_* depend on CONFIG_X86_*

* Oleg Nesterov <oleg@...hat.com> [2014-04-19 19:01:59]:

> Add the suitable ifdef's around good_insns_* arrays. We do not want
> to add the ugly ifdef's into their only user, uprobe_init_insn(), so
> the "#else" branch simply defines them as NULL. This doesn't generate
> the extra code, gcc is smart enough, although the code is fine even if
> it could not detect that (without CONFIG_IA32_EMULATION) is_64bit_mm()
> is __builtin_constant_p().
> 
> The patch looks more complicated because it also moves good_insns_64
> up close to good_insns_32.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

> ---
-- 
Thanks and Regards
Srikar Dronamraju

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