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Message-ID: <1423600952.1128.9.camel@misato.fc.hp.com> Date: Tue, 10 Feb 2015 13:42:32 -0700 From: Toshi Kani <toshi.kani@...com> To: Dave Hansen <dave.hansen@...el.com> Cc: akpm@...ux-foundation.org, hpa@...or.com, tglx@...utronix.de, mingo@...hat.com, arnd@...db.de, linux-mm@...ck.org, x86@...nel.org, linux-kernel@...r.kernel.org, Elliott@...com Subject: Re: [PATCH v2 5/7] x86, mm: Support huge KVA mappings on x86 On Tue, 2015-02-10 at 10:59 -0800, Dave Hansen wrote: > On 02/09/2015 02:45 PM, Toshi Kani wrote: > > Implement huge KVA mapping interfaces on x86. Select > > HAVE_ARCH_HUGE_VMAP when X86_64 or X86_32 with X86_PAE is set. > > Without X86_PAE set, the X86_32 kernel has the 2-level page > > tables and cannot provide the huge KVA mappings. > > Not that it's a big deal, but what's the limitation with the 2-level > page tables on 32-bit? We have a 4MB large page size available there > and we already use it for the kernel linear mapping. ioremap() calls arch-neutral ioremap_page_range() to set up I/O mappings with PTEs. This patch-set enables ioremap_page_range() to set up PUD & PMD mappings. With 2-level page table, I do not think this PUD/PMD mapping code works unless we add some special code. Thanks, -Toshi -- 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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