linux-kernel - Re: [PATCH 2/3] x86: add a is_e820

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:	Thu, 26 Mar 2015 11:04:13 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Christoph Hellwig <hch@....de>
Cc:	linux-nvdimm@...1.01.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	ross.zwisler@...ux.intel.com, axboe@...nel.dk, boaz@...xistor.com
Subject: Re: [PATCH 2/3] x86: add a is_e820_ram() helper


* Christoph Hellwig <hch@....de> wrote:

> On Thu, Mar 26, 2015 at 10:02:15AM +0100, Ingo Molnar wrote:
> > This is_e820_ram() factoring out becomes really messy in patch #3.
> > 
> > So you left out a bunch of places making comparisons with E820_RAM, 
> > notably e820_reserve_resources_late() and memblock_x86_fill() - and of 
> > course those have to be left out, otherwise NVRAM might be registered 
> > and used as real kernel RAM!
> > 
> > And this shows the weakness and confusion caused by the factoring out 
> > of is_e820_ram() and then adding E820_PMEM to its definition...
> > 
> > I'd rather you add explicit checks to E820_PMEM (why not E820_PRAM, to 
> > keep in line with the E820_RAM name?), and not lie about 
> > is_e820_ram(). It should result in the exact same end result, with 
> > less confusion.
> > 
> > I have no fundamental objections to the driver otherwise.
> 
> Does this patch (replaces patches 2 and 3) look better to you?

Yeah, the code is much clearer now:

  Acked-by: Ingo Molnar <mingo@...nel.org>

What tree is this intended for? Should I pick up the x86 bits?

Thanks,

	Ingo
--
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/