linux-kernel - Re: [PATCH 2/7] uprobes/x86: Fold prepare_fixups() into arch_uprobe_analyze

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Message-ID: <20140403163304.GB4882@linux.vnet.ibm.com>
Date:	Thu, 3 Apr 2014 22:03:04 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.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 2/7] uprobes/x86: Fold prepare_fixups() into
 arch_uprobe_analyze_insn()

* Oleg Nesterov <oleg@...hat.com> [2014-03-31 21:43:59]:

> No functional changes, preparation.
> 
> Shift the code from prepare_fixups() to arch_uprobe_analyze_insn()
> with the following modifications:
> 
> 	- Do not call insn_get_opcode() again, it was already called
> 	  by validate_insn_bits().
> 
> 	- Move "case 0xea" up. This way "case 0xff" can fall through
> 	  to default case.
> 
> 	- change "case 0xff" to use the nested "switch (MODRM_REG)",
> 	  this way the code looks a bit simpler.
> 
> 	- Make the comments look consistent.
> 
> While at it, kill the initialization of rip_rela_target_address and
> ->fixups, we can rely on kzalloc(). We will add the new members into
> arch_uprobe, it would be better to assume that everything is zero by
> default.
> 
> TODO: cleanup/fix the mess in validate_insn_bits() paths:
> 
> 	- validate_insn_64bits() and validate_insn_32bits() should be
> 	  unified.
> 
> 	- "ifdef" is not used consistently; if good_insns_64 depends
> 	  on CONFIG_X86_64, then probably good_insns_32 should depend
> 	  on CONFIG_X86_32/EMULATION
> 
> 	- the usage of mm->context.ia32_compat looks wrong if the task
> 	  is TIF_X32.
> 
> 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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