linux-kernel - Re: [Patch v2 4/6] x86/mm: Refine debug print string retrieval function

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]

Message-ID: <20191206151752.phfiyls3govuqeja@master>
Date:   Fri, 6 Dec 2019 15:17:52 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Wei Yang <richardw.yang@...ux.intel.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, richard.weiyang@...il.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.or,
        tglx@...utronix.de
Subject: Re: [Patch v2 4/6] x86/mm: Refine debug print string retrieval
 function

On Fri, Dec 06, 2019 at 11:27:46AM +0100, Peter Zijlstra wrote:
>On Fri, Dec 06, 2019 at 09:51:26AM +0800, Wei Yang wrote:
>
>> >> +#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_PAE)
>> >> +	static const char *sz[2] = { "4K", "4M" };
>> >> +#else
>> >> +	static const char *sz[4] = { "4K", "2M", "1G", "" };
>> >> +#endif
>> >> +	unsigned int idx, s;
>> >>  
>> >> +	for (idx = 0; idx < maxidx; idx++, mr++) {
>> >> +		s = (mr->page_size_mask >> PG_LEVEL_2M) & (ARRAY_SIZE(sz) - 1);
>> >
>> >Is it at all possible for !PAE to have 1G here, if you use the sz[4]
>> >definition unconditionally?
>> >
>> 
>> You mean remove the ifdef and use sz[4] for both condition?
>> 
>> Then how to differentiate 4M and 2M?
>
>Argh, I'm blind.. I failed to spot that. N/m then.

Never mind. I always do the same thing :-(

-- 
Wei Yang
Help you, Help me