From 1f65c13efef69b6dc908e588f91a133641d8475c Mon Sep 17 00:00:00 2001 From: AKASHI Takahiro Date: Tue, 24 Sep 2013 10:00:50 +0100 Subject: arm64: avoid multiple evaluation of ptr in get_user/put_user() get_user() is defined as a function macro in arm64, and trace_get_user() calls it as followed: get_user(ch, ptr++); Since the second parameter occurs twice in the definition, 'ptr++' is unexpectedly evaluated twice and trace_get_user() will generate a bogus string from user-provided one. As a result, some ftrace sysfs operations, like "echo FUNCNAME > set_ftrace_filter," hit this case and eventually fail. This patch fixes the issue both in get_user() and put_user(). Signed-off-by: AKASHI Takahiro [catalin.marinas@arm.com: added __user type annotation and s/optr/__p/] Signed-off-by: Catalin Marinas --- arch/arm64/include/asm/uaccess.h | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'arch') diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index edb3d5c73a32..7ecc2b23882e 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -166,9 +166,10 @@ do { \ #define get_user(x, ptr) \ ({ \ + __typeof__(*(ptr)) __user *__p = (ptr); \ might_fault(); \ - access_ok(VERIFY_READ, (ptr), sizeof(*(ptr))) ? \ - __get_user((x), (ptr)) : \ + access_ok(VERIFY_READ, __p, sizeof(*__p)) ? \ + __get_user((x), __p) : \ ((x) = 0, -EFAULT); \ }) @@ -227,9 +228,10 @@ do { \ #define put_user(x, ptr) \ ({ \ + __typeof__(*(ptr)) __user *__p = (ptr); \ might_fault(); \ - access_ok(VERIFY_WRITE, (ptr), sizeof(*(ptr))) ? \ - __put_user((x), (ptr)) : \ + access_ok(VERIFY_WRITE, __p, sizeof(*__p)) ? \ + __put_user((x), __p) : \ -EFAULT; \ }) -- cgit v1.2.3 From fc18047c732f6becba92618a397555927687efd3 Mon Sep 17 00:00:00 2001 From: Matthew Leach Date: Wed, 25 Sep 2013 16:33:13 +0100 Subject: arm64: use correct register width when retrieving ASID The ASID is represented as an unsigned int in mm_context_t and we currently use the mmid assembler macro to access this element of the struct. This should be accessed with a register of 32-bit width. If the incorrect register width is used the ASID will be returned in bits[32:63] of the register when running under big-endian. Fix a use of the mmid macro in tlb.S to use a 32-bit access. Signed-off-by: Will Deacon Signed-off-by: Matthew Leach Signed-off-by: Catalin Marinas --- arch/arm64/mm/tlb.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/arm64/mm/tlb.S b/arch/arm64/mm/tlb.S index 8ae80a18e8ec..19da91e0cd27 100644 --- a/arch/arm64/mm/tlb.S +++ b/arch/arm64/mm/tlb.S @@ -35,7 +35,7 @@ */ ENTRY(__cpu_flush_user_tlb_range) vma_vm_mm x3, x2 // get vma->vm_mm - mmid x3, x3 // get vm_mm->context.id + mmid w3, x3 // get vm_mm->context.id dsb sy lsr x0, x0, #12 // align address lsr x1, x1, #12 -- cgit v1.2.3 From 6db83cea1c975b9a102e17def7d2795814e1ae2b Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Fri, 27 Sep 2013 09:04:41 +0100 Subject: arm64: fix possible invalid FPSIMD initialization state If context switching happens during executing fpsimd_flush_thread(), stale value in FPSIMD registers will be saved into current thread's fpsimd_state by fpsimd_thread_switch(). That may cause invalid initialization state for the new process, so disable preemption when executing fpsimd_flush_thread(). Signed-off-by: Jiang Liu Cc: Jiang Liu Signed-off-by: Catalin Marinas --- arch/arm64/kernel/fpsimd.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch') diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index 1f2e4d5a5c0f..bb785d23dbde 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -80,8 +80,10 @@ void fpsimd_thread_switch(struct task_struct *next) void fpsimd_flush_thread(void) { + preempt_disable(); memset(¤t->thread.fpsimd_state, 0, sizeof(struct fpsimd_state)); fpsimd_load_state(¤t->thread.fpsimd_state); + preempt_enable(); } #ifdef CONFIG_KERNEL_MODE_NEON -- cgit v1.2.3 From ade37198937a52bc3f59c40ffb14cb6688b273b7 Mon Sep 17 00:00:00 2001 From: Ramkumar Ramachandra Date: Sat, 28 Sep 2013 12:19:55 +0100 Subject: arm64: include EXT4 in defconfig Most readily available root filesystems are formatted as EXT4 these days. For example, see the raring rootfs that the Debian folk is preparing [1]. [1]: http://people.debian.org/~wookey/bootstrap/rootfs/ Cc: Will Deacon Cc: Andreas Schwab Signed-off-by: Ramkumar Ramachandra Signed-off-by: Catalin Marinas --- arch/arm64/configs/defconfig | 1 + 1 file changed, 1 insertion(+) (limited to 'arch') diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig index 5b3e83217b03..798bcbb31fa7 100644 --- a/arch/arm64/configs/defconfig +++ b/arch/arm64/configs/defconfig @@ -72,6 +72,7 @@ CONFIG_LOGO=y # CONFIG_IOMMU_SUPPORT is not set CONFIG_EXT2_FS=y CONFIG_EXT3_FS=y +CONFIG_EXT4_FS=y # CONFIG_EXT3_DEFAULTS_TO_ORDERED is not set # CONFIG_EXT3_FS_XATTR is not set CONFIG_FUSE_FS=y -- cgit v1.2.3 From 4eb507b874035873dafdb381e61935fed7a8ad85 Mon Sep 17 00:00:00 2001 From: Ramkumar Ramachandra Date: Sat, 28 Sep 2013 12:19:56 +0100 Subject: arm64: include VIRTIO_{MMIO,BLK} in defconfig Currently, development on arm64 is aided by a Foundation_v8 emulator distributed by ARM [1]. To run their kernels, users will execute: $ ./Foundation_v8 --image linux-system.axf --block-device raring-rootfs To mount the raring-rootfs filesystem, the kernel parameter should typically include: root=/dev/vda For this device to be present, the kernel must be compiled with VIRTIO_{MMIO,BLK}. To make this work out-of-the-box, make it part of the default configuration. [1]: https://silver.arm.com/browse/FM00A Cc: Will Deacon Cc: Andreas Schwab Signed-off-by: Ramkumar Ramachandra Signed-off-by: Catalin Marinas --- arch/arm64/configs/defconfig | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig index 798bcbb31fa7..31c81e9b792e 100644 --- a/arch/arm64/configs/defconfig +++ b/arch/arm64/configs/defconfig @@ -42,7 +42,7 @@ CONFIG_IP_PNP_BOOTP=y # CONFIG_WIRELESS is not set CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug" CONFIG_DEVTMPFS=y -# CONFIG_BLK_DEV is not set +CONFIG_BLK_DEV=y CONFIG_SCSI=y # CONFIG_SCSI_PROC_FS is not set CONFIG_BLK_DEV_SD=y @@ -91,3 +91,5 @@ CONFIG_DEBUG_KERNEL=y CONFIG_DEBUG_INFO=y # CONFIG_FTRACE is not set CONFIG_ATOMIC64_SELFTEST=y +CONFIG_VIRTIO_MMIO=y +CONFIG_VIRTIO_BLK=y -- cgit v1.2.3 From 09d3ce74d7d60f37d1b030886ec659bbfe2e73bf Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Tue, 1 Oct 2013 21:48:43 +0100 Subject: arm64: Remove duplicate DEBUG_STACK_USAGE config This config item already exists generically in lib/Kconfig.debug. Remove the duplicate config in arm64. Signed-off-by: Stephen Boyd Signed-off-by: Catalin Marinas --- arch/arm64/Kconfig.debug | 7 ------- 1 file changed, 7 deletions(-) (limited to 'arch') diff --git a/arch/arm64/Kconfig.debug b/arch/arm64/Kconfig.debug index 1a6bfe954d49..835c559786bd 100644 --- a/arch/arm64/Kconfig.debug +++ b/arch/arm64/Kconfig.debug @@ -6,13 +6,6 @@ config FRAME_POINTER bool default y -config DEBUG_STACK_USAGE - bool "Enable stack utilization instrumentation" - depends on DEBUG_KERNEL - help - Enables the display of the minimum amount of free stack which each - task has ever had available in the sysrq-T output. - config EARLY_PRINTK bool "Early printk support" default y -- cgit v1.2.3