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From: Borislav Petkov <bp@amd64.org>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Jacob Shin <jacob.shin@amd.com>, X86-ML <x86@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"H. Peter Anvin" <hpa@zytor.com>, Tejun Heo <tj@kernel.org>,
	Dave Young <dyoung@redhat.com>, Chao Wang <chaowang@redhat.com>,
	Vivek Goyal <vgoyal@redhat.com>,
	Andreas Herrmann <andreas.herrmann3@amd.com>
Subject: Re: [PATCH 4/6] x86: Only direct map addresses that are marked as E820_RAM
Date: Wed, 29 Aug 2012 23:32:46 +0200	[thread overview]
Message-ID: <20120829213246.GE31869@aftab.osrc.amd.com> (raw)
In-Reply-To: <CAE9FiQWcYmROV1SHzk0_RUQfniDwgbyiCbcbRbXatYvYhuGp7Q@mail.gmail.com>

On Wed, Aug 29, 2012 at 02:17:51PM -0700, Yinghai Lu wrote:
> > +struct range pfn_mapped[E820_X_MAX];
> > +int nr_pfn_mapped;
> 
> change to static?
> 
> > +
> > +void add_pfn_range_mapped(unsigned long start_pfn, unsigned long end_pfn)
> > +{
> > +       nr_pfn_mapped = add_range_with_merge(pfn_mapped, E820_X_MAX,
> > +                                            nr_pfn_mapped, start_pfn, end_pfn);
> > +       nr_pfn_mapped = clean_sort_range(pfn_mapped, E820_X_MAX);
> > +
> > +       max_pfn_mapped = max(max_pfn_mapped, end_pfn);
> > +
> > +       if (end_pfn <= (1UL << (32 - PAGE_SHIFT)))
> > +               max_low_pfn_mapped = max(max_low_pfn_mapped, end_pfn);
> > +}
> > +
> > +bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn)
> > +{
> > +       int i;
> > +
> > +       for (i = 0; i < nr_pfn_mapped; i++)
> > +               if ((start_pfn >= pfn_mapped[i].start) &&
> > +                   (end_pfn <= pfn_mapped[i].end))
> > +                       return true;
> > +
> > +       return false;
> > +}
> > +
> > +bool pfn_is_mapped(unsigned long pfn)
> > +{
> > +       return pfn_range_is_mapped(pfn, pfn + 1);
> > +}
> 
> wonder if those functions have to be in arch/x86/kernel/setup.c.
> 
> also do we need to update the tracking array when we have do memory hot-remove?

Would you please make sure you've reviewed this whole patchset
thoroughly so that Jacob can do all changes at once and not keep
resending them twice a week.

Thanks a lot!

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
GM: Alberto Bozzo
Reg: Dornach, Landkreis Muenchen
HRB Nr. 43632 WEEE Registernr: 129 19551

  reply	other threads:[~2012-08-29 21:33 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-08-29 19:04 [PATCH V5 0/6] x86: Create direct mappings for E820_RAM only Jacob Shin
2012-08-29 19:04 ` [PATCH 1/6] x86, mm: Add page_size_mask() Jacob Shin
2012-08-29 19:04 ` [PATCH 2/6] x86, mm: Split out split_mem_range Jacob Shin
2012-08-29 19:04 ` [PATCH 3/6] x86/mm: find_early_table_space based on memory ranges that are being mapped Jacob Shin
2012-08-29 19:04 ` [PATCH 4/6] x86: Only direct map addresses that are marked as E820_RAM Jacob Shin
2012-08-29 21:17   ` Yinghai Lu
2012-08-29 21:32     ` Borislav Petkov [this message]
2012-08-30  6:28       ` H. Peter Anvin
2012-08-30 23:06         ` [PATCH 0/8] x86, mm: init_memory_mapping cleanup Yinghai Lu
2012-08-30 23:06           ` [PATCH 1/8] x86, mm: Add global page_size_mask Yinghai Lu
2012-08-30 23:06           ` [PATCH 2/8] x86, mm: Split out split_mem_range Yinghai Lu
2012-08-30 23:06           ` [PATCH 3/8] x86, mm: Moving init_memory_mapping calling Yinghai Lu
2012-08-30 23:06           ` [PATCH 4/8] x86, mm: Revert back good_end setting for 64bit Yinghai Lu
2012-08-30 23:06           ` [PATCH 5/8] x86, mm: Find early page table only one time Yinghai Lu
2012-08-30 23:06           ` [PATCH 6/8] x86: if kernel .text .data .bss are not marked as E820_RAM, complain and fix Yinghai Lu
2012-08-30 23:06           ` [PATCH 7/8] x86: Fixup code testing if a pfn is direct mapped Yinghai Lu
2012-08-30 23:06           ` [PATCH 8/8] x86: Only direct map addresses that are marked as E820_RAM Yinghai Lu
2012-08-30 23:14           ` [PATCH 0/8] x86, mm: init_memory_mapping cleanup Yinghai Lu
2012-08-30 23:22           ` Jacob Shin
2012-08-29 21:46     ` [PATCH 4/6] x86: Only direct map addresses that are marked as E820_RAM Jacob Shin
2012-08-29 19:04 ` [PATCH 5/6] x86: Fixup code testing if a pfn is direct mapped Jacob Shin
2012-08-29 21:02   ` Yinghai Lu
2012-08-29 19:04 ` [PATCH 6/6] x86: if kernel .text .data .bss are not marked as E820_RAM, complain and fix Jacob Shin

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