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From: stuart.yoder@freescale.com (Stuart Yoder)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC] arm64: defconfig: enable 48-bit VA by default
Date: Wed, 22 Jul 2015 19:49:15 +0000	[thread overview]
Message-ID: <CY1PR0301MB07488D6DC5F0B171D6B290E187830@CY1PR0301MB0748.namprd03.prod.outlook.com> (raw)

Catalin/Will,

This is not a patch mean to be applied, but a query about whether there
is any reason to not enable 48-bit VA by default in the arm64 defconfig.

The Freescale LS2085A physical memory map requires 48-bit VA in Linux for the
reasons mentioned in [1].

Based on the comment in [1] by Catalin, it seems that the intent
is to turn this on by default.

Is there any issues anyone sees with a patch that does this:

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 4e17e7e..5acf75d 100644
@@ -47,6 +47,7 @@ CONFIG_ARCH_ZYNQMP=y
 CONFIG_PCI=y
 CONFIG_PCI_MSI=y
 CONFIG_PCI_XGENE=y
+CONFIG_ARM64_VA_BITS_48=y
 CONFIG_SMP=y
 CONFIG_PREEMPT=y
 CONFIG_KSM=y

Thanks,
Stuart

[1] https://www.marc.info/?l=linux-arm-kernel&m=140965303205473&w=1

             reply	other threads:[~2015-07-22 19:49 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-22 19:49 Stuart Yoder [this message]
2015-07-23 12:44 ` [RFC] arm64: defconfig: enable 48-bit VA by default Marc Zyngier
2015-07-23 13:59   ` Stuart Yoder
2015-07-29 19:27   ` Stuart Yoder
2015-07-29 19:51     ` Ard Biesheuvel
2015-07-29 20:49       ` Stuart Yoder
2015-07-29 20:57         ` Arnd Bergmann
2015-07-29 20:58         ` Ard Biesheuvel
2015-07-30 10:13         ` Catalin Marinas
2015-07-30 14:52           ` Stuart Yoder
2015-07-30 16:12             ` Catalin Marinas
2015-07-30 16:32               ` Stuart Yoder
2015-07-30 16:41                 ` Catalin Marinas
2015-07-30 17:45                 ` Ard Biesheuvel
2015-07-30 18:10                   ` Stuart Yoder
2015-08-07 19:01                   ` Stuart Yoder
2015-08-08  8:20                     ` Ard Biesheuvel
2015-08-13 19:24                       ` Stuart Yoder
2015-08-14 12:15                         ` Ard Biesheuvel
2015-08-14 13:24                           ` Catalin Marinas
2015-08-14 13:55                             ` Ard Biesheuvel
2015-08-14 15:37                               ` Catalin Marinas
2015-07-30 19:27           ` Ard Biesheuvel
2015-07-31 12:53             ` Catalin Marinas
2015-07-31 13:10               ` Ard Biesheuvel
2015-07-31 13:22                 ` Catalin Marinas
2015-07-31 13:30                   ` Ard Biesheuvel
2015-08-01 21:08                     ` Arnd Bergmann
2015-08-02  6:19                       ` Ard Biesheuvel
2015-08-03  8:00                         ` Arnd Bergmann

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