user/sven/linux.git/arch/microblaze, branch v3.2.80

vm: add VM_FAULT_SIGSEGV handling support

2015-02-20T00:49:40Z

commit 33692f27597fcab536d7cbbcc8f52905133e4aa7 upstream. The core VM already knows about VM_FAULT_SIGBUS, but cannot return a "you should SIGSEGV" error, because the SIGSEGV case was generally handled by the caller - usually the architecture fault handler. That results in lots of duplication - all the architecture fault handlers end up doing very similar "look up vma, check permissions, do retries etc" - but it generally works. However, there are cases where the VM actually wants to SIGSEGV, and applications _expect_ SIGSEGV. In particular, when accessing the stack guard page, libsigsegv expects a SIGSEGV. And it usually got one, because the stack growth is handled by that duplicated architecture fault handler. However, when the generic VM layer started propagating the error return from the stack expansion in commit fee7e49d4514 ("mm: propagate error from stack expansion even for guard page"), that now exposed the existing VM_FAULT_SIGBUS result to user space. And user space really expected SIGSEGV, not SIGBUS. To fix that case, we need to add a VM_FAULT_SIGSEGV, and teach all those duplicate architecture fault handlers about it. They all already have the code to handle SIGSEGV, so it's about just tying that new return value to the existing code, but it's all a bit annoying. This is the mindless minimal patch to do this. A more extensive patch would be to try to gather up the mostly shared fault handling logic into one generic helper routine, and long-term we really should do that cleanup. Just from this patch, you can generally see that most architectures just copied (directly or indirectly) the old x86 way of doing things, but in the meantime that original x86 model has been improved to hold the VM semaphore for shorter times etc and to handle VM_FAULT_RETRY and other "newer" things, so it would be a good idea to bring all those improvements to the generic case and teach other architectures about them too. Reported-and-tested-by: Takashi Iwai Tested-by: Jan Engelhardt Acked-by: Heiko Carstens # "s390 still compiles and boots" Cc: linux-arch@vger.kernel.org Signed-off-by: Linus Torvalds [bwh: Backported to 3.2: - Adjust filenames, context - Drop arc, metag, nios2 and lustre changes - For sh, patch both 32-bit and 64-bit implementations to use goto bad_area - For s390, pass int_code and trans_exc_code as arguments to do_no_context() and do_sigsegv()] Signed-off-by: Ben Hutchings

microblaze: Fix makefile to work with latest toolchain

2014-09-13T22:41:51Z

commit 00708d421a22a0f82de2dbb91ca6213b3dcc5267 upstream. When building with latest binutils, vmlinux includes some sections which need to be stripped out when building the binary image. Signed-off-by: Michal Simek Signed-off-by: Ben Hutchings

microblaze: Fix __futex_atomic_op macro register usage

2013-09-10T00:57:39Z

commit 8cf662ed3ef190fddc186bb5b1cd75eb3880d5a9 upstream. Old Microblaze toolchain supported "b" contstrains for all register but it always points to general purpose reg. New Microblaze toolchain is more strict in this and general purpose register should be used there "r". Signed-off-by: Michal Simek Signed-off-by: Ben Hutchings

microblaze: Update microblaze defconfigs

2013-09-10T00:57:30Z

commit d0e045401f268a8de6f87d65678214748b772680 upstream. The main reason is 0-day testing system which can directly use these defconfigs for testing. Enable support for all xilinx drivers which Microblaze can use and disable dependency on external rootfs.cpio. There is only one exception which is axi ethernet driver which still uses NO_IRQ which is not defined for Microblaze. Signed-off-by: Michal Simek Cc: Guenter Roeck Signed-off-by: Greg Kroah-Hartman Signed-off-by: Ben Hutchings

microblaze: Do not select GENERIC_GPIO by default

2012-06-10T13:41:39Z

commit 59516b07b4ffa7e607a5787674ea3c405f1b390c upstream. The microblaze architecture does not provide a native GPIO API implementation nor requires GPIOLIB, but still selects GENERIC_GPIO by default. As a result the following build error occurs, if GPIOLIB is not selected: include/asm-generic/gpio.h: In function 'gpio_get_value_cansleep': include/asm-generic/gpio.h:218: error: implicit declaration of function '__gpio_get_value' include/asm-generic/gpio.h: In function 'gpio_set_value_cansleep': include/asm-generic/gpio.h:224: error: implicit declaration of function '__gpio_set_value' This patch addresses the issue by not selecting GENERIC_GPIO by default. This causes the GPIO API to be stubbed out if no implementation is provided. Signed-off-by: Lars-Peter Clausen Tested-by: Michal Simek Signed-off-by: Ben Hutchings

microblaze: bury asm/namei.h

2011-11-21T21:48:28Z

altroot support has been gone for years, along with arch/*/asm/namei.h; looks like a dummy survivor that sat it out in microblaze tree... Signed-off-by: Al Viro

Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux

2011-11-07T03:44:47Z

* 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux: (230 commits) Revert "tracing: Include module.h in define_trace.h" irq: don't put module.h into irq.h for tracking irqgen modules. bluetooth: macroize two small inlines to avoid module.h ip_vs.h: fix implicit use of module_get/module_put from module.h nf_conntrack.h: fix up fallout from implicit moduleparam.h presence include: replace linux/module.h with "struct module" wherever possible include: convert various register fcns to macros to avoid include chaining crypto.h: remove unused crypto_tfm_alg_modname() inline uwb.h: fix implicit use of asm/page.h for PAGE_SIZE pm_runtime.h: explicitly requires notifier.h linux/dmaengine.h: fix implicit use of bitmap.h and asm/page.h miscdevice.h: fix up implicit use of lists and types stop_machine.h: fix implicit use of smp.h for smp_processor_id of: fix implicit use of errno.h in include/linux/of.h of_platform.h: delete needless include acpi: remove module.h include from platform/aclinux.h miscdevice.h: delete unnecessary inclusion of module.h device_cgroup.h: delete needless include net: sch_generic remove redundant use of net: inet_timewait_sock doesnt need ... Fix up trivial conflicts (other header files, and removal of the ab3550 mfd driver) in - drivers/media/dvb/frontends/dibx000_common.c - drivers/media/video/{mt9m111.c,ov6650.c} - drivers/mfd/ab3550-core.c - include/linux/dmaengine.h

microblaze: Add export.h to arch/microblaze files as required

2011-10-31T23:31:06Z

For access to the EXPORT_SYMBOL variants and THIS_MODULE macros. Signed-off-by: Paul Gortmaker

Merge branch 'next' of git://git.monstr.eu/linux-2.6-microblaze

2011-10-31T23:13:44Z

* 'next' of git://git.monstr.eu/linux-2.6-microblaze: microblaze: Remove __ARCH_WANT_INTERRUPTS_ON_CTXSW usage microblaze: Use delay slot in __strnlen_user, __strncpy_user microblaze: Remove NET_IP_ALIGN from system.h microblaze: Add __ucmpdi2() helper function microblaze: Raise SIGFPE/FPE_INTDIV for div by zero microblaze: Switch ELF_ARCH code to 189 microblaze: Added DMA sync operations microblaze: Moved __dma_sync() to dma-mapping.h microblaze: Add PVR for Microblaze v8.20.a microblaze: Fix access_ok macro microblaze: Add loop unrolling for PAGE in copy_tofrom_user microblaze: Simplify logic for unaligned byte copying microblaze: Change label names - copy_tofrom_user microblaze: Separate fixup section definition microblaze: Change label name in copy_tofrom_user microblaze: Clear top bit from cnt32_to_63

microblaze: Remove __ARCH_WANT_INTERRUPTS_ON_CTXSW usage

2011-10-14T10:28:42Z

As far as I can tell the only reason microblaze has __ARCH_WANT_INTERRUPTS_ON_CTXSW is because it initializes new task state with interrupts enabled so that on switch_to() interrupts get enabled. So change copy_thread() to clear MSR_IE instead of set it, this will ensure switch_to() will always keep IRQs disabled. The scheduler will disable IRQs when taking rq->lock in schedule() and enable IRQs in finish_lock_switch() after its done its magic. This leaves ARM the only __ARCH_WANT_INTERRUPTS_ON_CTXSW user. Signed-off-by: Peter Zijlstra Signed-off-by: Michal Simek