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Message-Id: <200712112221.17697.arnd@arndb.de> Date: Tue, 11 Dec 2007 22:21:15 +0100 From: Arnd Bergmann <arnd@...db.de> To: linuxppc-dev@...abs.org Cc: Christoph Hellwig <hch@....de>, Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org Subject: Re: [RFC][POWERPC] Provide a way to protect 4k subpages when using 64k pages On Tuesday 11 December 2007, Christoph Hellwig wrote: > Using 4k pages should basically be a pre-process flag > (which it already is as an implementation detail in your patch), and > thus the proper way to mark it should be a personality flag. This > also means it could be implied by certain personalities, e.g. powerpc > 32bit for full compatiblity. All these process would use plain mmap/ > mprotect to deal with the subpage protections. If you want to make it a per-process flag, wouldn't a prctl bit be more appropriate than a personality flag? That way you could at least set it independent from other personality settings. > At least ia64 and mips have multiple pages sizes already and I suspect > more architectures will grow support for it. Another related option might be the alternative page table layouts that Martin Schwidefsky has implemented for concurrent 2/3/4-level page tables on s390. Arnd <>< -- 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/
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