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Steven Capper ded9477984 ARM: 8109/1: mm: Modify pte_write and pmd_write logic for LPAE 
For LPAE, we have the following means for encoding writable or dirty
ptes:
                              L_PTE_DIRTY       L_PTE_RDONLY
    !pte_dirty && !pte_write        0               1
    !pte_dirty && pte_write         0               1
    pte_dirty && !pte_write         1               1
    pte_dirty && pte_write          1               0

So we can't distinguish between writeable clean ptes and read only
ptes. This can cause problems with ptes being incorrectly flagged as
read only when they are writeable but not dirty.

This patch renumbers L_PTE_RDONLY from AP[2] to a software bit #58,
and adds additional logic to set AP[2] whenever the pte is read only
or not dirty. That way we can distinguish between clean writeable ptes
and read only ptes.

HugeTLB pages will use this new logic automatically.

We need to add some logic to Transparent HugePages to ensure that they
correctly interpret the revised pgprot permissions (L_PTE_RDONLY has
moved and no longer matches PMD_SECT_AP2). In the process of revising
THP, the names of the PMD software bits have been prefixed with L_ to
make them easier to distinguish from their hardware bit counterparts.

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
 		2014-07-24 14:27:08 +01:00
..
boot ARM: 8079/1: zImage: identify kernel endianness 2014-07-18 12:29:08 +01:00
common ARM: 8081/1: MCPM: provide infrastructure to allow for MCPM loopback 2014-07-18 11:58:00 +01:00
configs The i.MX fixes for 3.16: 2014-06-23 14:12:48 +02:00
crypto ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
firmware
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include ARM: 8109/1: mm: Modify pte_write and pmd_write logic for LPAE 2014-07-24 14:27:08 +01:00
kernel ARM: 8088/1: vmlinux.lds.S: drop redundant .comment 2014-07-18 12:29:23 +01:00
kvm ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
lib ARM: 8091/2: add get_user() support for 8 byte types 2014-07-18 12:29:34 +01:00
mach-at91 ARM: at91: fix at91_sysirq_mask_rtc for sam9x5 SoCs 2014-06-06 16:08:08 -07:00
mach-axxia ARM: Add platform support for LSI AXM55xx SoC 2014-05-23 18:18:39 +02:00
mach-bcm ARM: use menuconfig for sub-arch menus 2014-06-17 17:09:48 +02:00
mach-berlin ARM: use menuconfig for sub-arch menus 2014-06-17 17:09:48 +02:00
mach-clps711x ARM: 8025/1: Get rid of meminfo 2014-06-01 01:17:12 +01:00
mach-cns3xxx ARM: use menuconfig for sub-arch menus 2014-06-17 17:09:48 +02:00
mach-davinci ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
mach-dove
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mach-ebsa110
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mach-efm32
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mach-ep93xx ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
mach-exynos ARM: make it easier to check the CPU part number correctly 2014-07-18 12:29:02 +01:00
mach-footbridge ARM: 8025/1: Get rid of meminfo 2014-06-01 01:17:12 +01:00
mach-gemini
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mach-highbank ARM: Remove ARCH_HAS_CPUFREQ config option 2014-06-17 17:09:39 +02:00
mach-hisi
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mach-imx ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
mach-integrator ARM: integrator: fix OF-related regression 2014-06-24 14:27:03 +02:00
mach-iop13xx ARM: 8101/1: mach-iop13xx: fix possible build failure 2014-07-18 11:57:59 +01:00
mach-iop32x
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mach-iop33x
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mach-ixp4xx
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mach-keystone ARM: keystone requires ARM_PATCH_PHYS_VIRT 2014-06-17 17:09:22 +02:00
mach-kirkwood mvebu SoC changes for v3.16 2014-05-19 21:59:55 -07:00
mach-ks8695
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mach-lpc32xx mmc: mmci: Enforce DMA configuration through DT 2014-06-02 11:20:25 +02:00
mach-mmp
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mach-moxart ARM: use menuconfig for sub-arch menus 2014-06-17 17:09:48 +02:00
mach-msm Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into next 2014-06-05 15:57:04 -07:00
mach-mv78xx0
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mach-mvebu ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
mach-mxs
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mach-netx
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mach-nomadik ARM: use menuconfig for sub-arch menus 2014-06-17 17:09:48 +02:00
mach-nspire
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mach-omap1 ARM: OMAP: replace checks for CONFIG_USB_GADGET_OMAP 2014-05-16 14:14:25 -07:00
mach-omap2 ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
mach-orion5x ARM: SoC updates for 3.16 (part 2) 2014-06-11 11:03:24 -07:00
mach-picoxcell
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mach-prima2 ARM: use menuconfig for sub-arch menus 2014-06-17 17:09:48 +02:00
mach-pxa ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
mach-qcom ARM: use menuconfig for sub-arch menus 2014-06-17 17:09:48 +02:00
mach-realview Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into next 2014-06-05 15:57:04 -07:00
mach-rockchip Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into next 2014-06-05 15:57:04 -07:00
mach-rpc
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mach-s3c24xx ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
mach-s3c64xx ARM: samsung: make SAMSUNG_DMADEV optional 2014-06-17 17:09:37 +02:00
mach-s5p64x0 ARM: samsung: make SAMSUNG_DMADEV optional 2014-06-17 17:09:37 +02:00
mach-s5pc100 ARM: samsung: make SAMSUNG_DMADEV optional 2014-06-17 17:09:37 +02:00
mach-s5pv210 ARM: samsung: make SAMSUNG_DMADEV optional 2014-06-17 17:09:37 +02:00
mach-sa1100 ARM: 8085/1: sa1100: collie: add top boot mtd partition 2014-06-29 10:29:34 +01:00
mach-shmobile ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
mach-socfpga ARM: l2c: socfpga: convert to generic l2c OF initialisation 2014-05-30 00:50:04 +01:00
mach-spear ARM: Remove ARCH_HAS_CPUFREQ config option 2014-06-17 17:09:39 +02:00
mach-sti Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2014-06-24 13:59:00 -07:00
mach-sunxi ARM: sunxi: allow building without reset controller 2014-05-26 21:27:22 +02:00
mach-tegra ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
mach-u300 ARM: use menuconfig for sub-arch menus 2014-06-17 17:09:48 +02:00
mach-ux500 Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2014-06-24 13:59:00 -07:00
mach-versatile
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mach-vexpress ARM: make it easier to check the CPU part number correctly 2014-07-18 12:29:02 +01:00
mach-vt8500 ARM: Remove ARCH_HAS_CPUFREQ config option 2014-06-17 17:09:39 +02:00
mach-w90x900
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mach-zynq ARM: Remove ARCH_HAS_CPUFREQ config option 2014-06-17 17:09:39 +02:00
mm ARM: 8109/1: mm: Modify pte_write and pmd_write logic for LPAE 2014-07-24 14:27:08 +01:00
net net: filter: get rid of BPF_S_* enum 2014-06-01 22:16:58 -07:00
nwfpe ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
oprofile ARM: 8075/1: oprofile: Use of arm_get_current_stackframe 2014-07-18 12:29:20 +01:00
plat-iop
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plat-omap ARM: OMAP: add deprecation message for legacy OMAP DMA API 2014-07-01 15:00:26 +01:00
plat-orion
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plat-pxa
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plat-samsung Couple of DT fixes for STi platform issues discovered on V3.16-rc1. 2014-06-20 10:59:05 +02:00
plat-versatile
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tools
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vfp ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
xen ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
Kconfig ARM: exynos: cleanup kconfig option display 2014-06-17 17:09:41 +02:00
Kconfig-nommu
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Kconfig.debug Samsung Exynos updates for 3.16 2014-05-30 21:44:49 -07:00
Makefile ARM: 8096/1: Describe required sort order for textofs-y (TEXT_OFFSET) 2014-07-18 12:29:27 +01:00