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Message-ID: <Yh9SuiayqcDdIB3B@shell.armlinux.org.uk> Date: Wed, 2 Mar 2022 11:19:22 +0000 From: "Russell King (Oracle)" <linux@...linux.org.uk> To: Anshuman Khandual <anshuman.khandual@....com> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>, Christophe Leroy <christophe.leroy@...roup.eu>, "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>, "linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>, "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>, "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>, "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>, "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>, "linux-hexagon@...r.kernel.org" <linux-hexagon@...r.kernel.org>, "linux-csky@...r.kernel.org" <linux-csky@...r.kernel.org>, Christoph Hellwig <hch@...radead.org>, "linux-snps-arc@...ts.infradead.org" <linux-snps-arc@...ts.infradead.org>, "linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>, Arnd Bergmann <arnd@...db.de>, "linux-um@...ts.infradead.org" <linux-um@...ts.infradead.org>, "linux-m68k@...ts.linux-m68k.org" <linux-m68k@...ts.linux-m68k.org>, "openrisc@...ts.librecores.org" <openrisc@...ts.librecores.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-alpha@...r.kernel.org" <linux-alpha@...r.kernel.org>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org> Subject: Re: [PATCH V3 09/30] arm/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT On Wed, Mar 02, 2022 at 04:36:52PM +0530, Anshuman Khandual wrote: > On 3/2/22 3:35 PM, Geert Uytterhoeven wrote: > > I doubt the switch() variant would give better code on any platform. > > > > What about using tables everywhere, using designated initializers > > to improve readability? > > Designated initializers ? Could you please be more specific. A table look > up on arm platform would be something like this and arm_protection_map[] > needs to be updated with user_pgprot like before. There is *absolutely* nothing wrong with that. Updating it once during boot is way more efficient than having to compute the value each time vm_get_page_prot() gets called. Thanks. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
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