linux-kernel - Re: [PATCH v4 3/7] x86/flush_tlb: try flush_tlb_single one by one in flush_tlb

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 12 May 2012 16:01:20 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Borislav Petkov <bp@...64.org>
CC:	rob@...dley.net, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, arnd@...db.de, rostedt@...dmis.org,
	fweisbec@...il.com, jeremy@...p.org, gregkh@...uxfoundation.org,
	borislav.petkov@....com, riel@...hat.com, luto@....edu,
	avi@...hat.com, len.brown@...el.com, dhowells@...hat.com,
	fenghua.yu@...el.com, ak@...ux.intel.com, cpw@....com,
	steiner@....com, akpm@...ux-foundation.org, penberg@...nel.org,
	hughd@...gle.com, rientjes@...gle.com,
	kosaki.motohiro@...fujitsu.com, n-horiguchi@...jp.nec.com,
	paul.gortmaker@...driver.com, trenn@...e.de, tj@...nel.org,
	oleg@...hat.com, axboe@...nel.dk, a.p.zijlstra@...llo.nl,
	kamezawa.hiroyu@...fujitsu.com, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/7] x86/flush_tlb: try flush_tlb_single one by one
 in flush_tlb_range

On 05/10/2012 05:04 PM, Alex Shi wrote:

> 
>>> +
>>> +#define FLUSHALL_BAR	16
>>> +
>>
>> Btw, you can save a bunch of indenting on this function, let me add
>> the final version here from the whole patchset so I can comment on it
>> easier:
>>
>>> void __flush_tlb_range(struct mm_struct *mm, unsigned long start,
>>>                                 unsigned long end, unsigned long vmflag)
>>> {
>>>         preempt_disable();
>>>         if (current->active_mm == mm) {
>>
>> 	if (current->active_mm != mm)
>> 		goto flush_all;
>>
>> Now this whole piece below can move one indentation level to the left.


that is helpful and not imply logical too much.

>>
>> Then you can do:
>>
>> 	if (!current->mm)
>> 		goto leave;
>>
>> and add the "leave" label below.


I tried this, found too many goto and label is worse than line breaking. :(

>>
>> Now you're saving yet another indentation level, bringing the meat of
>> the function at 1st indentation level, which is cool and gives you much
>> more room so that you don't have to linebreak longer statements.
>>
> 
> 
> sure, thanks! :)


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/