From: Ingo Molnar <mingo@elte.hu>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Tejun Heo <tj@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] x86,mm,64bit: Round up memory boundary for init_memory_mapping_high()
Date: Fri, 25 Feb 2011 11:03:36 +0100 [thread overview]
Message-ID: <20110225100336.GA26608@elte.hu> (raw)
In-Reply-To: <4D674A33.8000809@kernel.org>
* Yinghai Lu <yinghai@kernel.org> wrote:
> init_memory_mapping_active_regions(unsigned long start, unsigned long end)
> {
> struct mapping_work_data data;
> + int use_gbpages;
> +
> + /* see init_memory_mapping() for the setting */
> +#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK)
> + use_gbpages = 0;
> +#else
> + use_gbpages = direct_gbpages;
> +#endif
Sigh. You should *never* ever even think about writing such code. It only results in
crap, and in crap duplicated elsewhere as well:
if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK)
/*
* For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
* This will simplify cpa(), which otherwise needs to support splitting
* large pages into small in interrupt context, etc.
*/
use_pse = use_gbpages = 0;
#else
use_pse = cpu_has_pse;
use_gbpages = direct_gbpages;
#endif
Thanks,
Ingo
next prev parent reply other threads:[~2011-02-25 10:03 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-23 17:19 questions about init_memory_mapping_high() Tejun Heo
2011-02-23 20:24 ` Yinghai Lu
2011-02-23 20:46 ` Tejun Heo
2011-02-23 20:51 ` Yinghai Lu
2011-02-23 21:03 ` Tejun Heo
2011-02-23 22:17 ` Yinghai Lu
2011-02-24 9:15 ` Tejun Heo
2011-02-25 1:37 ` Yinghai Lu
2011-02-25 1:38 ` [PATCH 1/2] x86,mm: Introduce init_memory_mapping_ext() Yinghai Lu
2011-02-25 6:20 ` [PATCH 2/2] x86,mm,64bit: Round up memory boundary for init_memory_mapping_high() Yinghai Lu
2011-02-25 10:03 ` Ingo Molnar [this message]
2011-02-25 20:22 ` Yinghai Lu
2011-02-26 3:06 ` [PATCH 1/3] x86, mm: Introduce global page_size_mask Yinghai Lu
2011-02-26 3:07 ` [PATCH 2/3] x86,mm: Introduce init_memory_mapping_ext() Yinghai Lu
2011-02-26 3:08 ` [PATCH 3/3] x86,mm,64bit: Round up memory boundary for init_memory_mapping_high() Yinghai Lu
2011-02-26 10:36 ` Tejun Heo
2011-02-26 10:55 ` Tejun Heo
2011-02-25 11:16 ` [PATCH 2/2] " Tejun Heo
2011-02-25 20:18 ` Yinghai Lu
2011-02-26 8:57 ` Tejun Heo
2011-02-27 11:53 ` Ingo Molnar
2011-02-28 18:14 ` questions about init_memory_mapping_high() H. Peter Anvin
2011-03-01 8:29 ` Tejun Heo
2011-03-01 19:44 ` H. Peter Anvin
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