linux-kernel - Re: [PATCH v6 3/4] arm64: mm: support ARCH_MMAP_RND

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Message-ID: <566F2A5D.6010100@android.com>
Date:	Mon, 14 Dec 2015 12:45:17 -0800
From:	Daniel Cashman <dcashman@...roid.com>
To:	Will Deacon <will.deacon@....com>
Cc:	linux-kernel@...r.kernel.org, linux@....linux.org.uk,
	akpm@...ux-foundation.org, keescook@...omium.org, mingo@...nel.org,
	linux-arm-kernel@...ts.infradead.org, corbet@....net,
	dzickus@...hat.com, ebiederm@...ssion.com, xypron.glpk@....de,
	jpoimboe@...hat.com, kirill.shutemov@...ux.intel.com,
	n-horiguchi@...jp.nec.com, aarcange@...hat.com, mgorman@...e.de,
	tglx@...utronix.de, rientjes@...gle.com, linux-mm@...ck.org,
	linux-doc@...r.kernel.org, salyzyn@...roid.com, jeffv@...gle.com,
	nnk@...gle.com, catalin.marinas@....com, hpa@...or.com,
	x86@...nel.org, hecmargi@....es, bp@...e.de, dcashman@...gle.com,
	arnd@...db.de, jonathanh@...dia.com
Subject: Re: [PATCH v6 3/4] arm64: mm: support ARCH_MMAP_RND_BITS.

On 12/14/2015 03:19 AM, Will Deacon wrote:
>> +# max bits determined by the following formula:
>> +#  VA_BITS - PAGE_SHIFT - 3
> 
> Now that we have this comment, I think we can drop the unsupported
> combinations from the list below. That means we just end up with:
> 
>> +config ARCH_MMAP_RND_BITS_MAX
>> +       default 19 if ARM64_VA_BITS=36
>> +       default 24 if ARM64_VA_BITS=39
>> +       default 27 if ARM64_VA_BITS=42
>> +       default 30 if ARM64_VA_BITS=47
>> +       default 29 if ARM64_VA_BITS=48 && ARM64_64K_PAGES
>> +       default 31 if ARM64_VA_BITS=48 && ARM64_16K_PAGES
>> +       default 33 if ARM64_VA_BITS=48

Unless you object, I'd like to keep the last 3 as well, to mirror the
min bits, should any new configurations be added but not reflected here:
+       default 15 if ARM64_64K_PAGES
+       default 17 if ARM64_16K_PAGES
+       default 18

The first two of these three should be changed as well to 14 and 16.

Thanks,
Dan
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