kernel.git/arch/parisc/mm, branch linux-4.5.y

parisc: Unbreak handling exceptions from kernel modules

2016-04-20T06:45:05Z

commit 2ef4dfd9d9f288943e249b78365a69e3ea3ec072 upstream. Handling exceptions from modules never worked on parisc. It was just masked by the fact that exceptions from modules don't happen during normal use. When a module triggers an exception in get_user() we need to load the main kernel dp value before accessing the exception_data structure, and afterwards restore the original dp value of the module on exit. Noticed-by: Mikulas Patocka Signed-off-by: Helge Deller Signed-off-by: Greg Kroah-Hartman

parisc: Protect huge page pte changes with spinlocks

2016-01-16T18:19:14Z

PA-RISC doesn't have atomic instructions to modify page table entries, so it takes spinlock in the TLB handler and modifies the page table entry non-atomically. If you modify the page table entry without the spinlock, you may race with TLB handler on another CPU and your modification may be lost. Protect against that with usage of purge_tlb_start() and purge_tlb_end() which handles the TLB spinlock. Signed-off-by: Helge Deller Cc: stable@vger.kernel.org # v4.4

Merge branch 'parisc-4.4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

2015-11-22T20:50:58Z

Pull parisc update from Helge Deller: "This patchset adds Huge Page and HUGETLBFS support for parisc" Honestly, the hugepage support should have gone through in the merge window, and is not really an rc-time fix. But it only touches arch/parisc, and I cannot find it in myself to care. If one of the three parisc users notices a breakage, I will point at Helge and make rude farting noises. * 'parisc-4.4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Map kernel text and data on huge pages parisc: Add Huge Page and HUGETLBFS support parisc: Use long branch to do_syscall_trace_exit parisc: Increase initial kernel mapping to 32MB on 64bit kernel parisc: Initialize the fault vector earlier in the boot process. parisc: Add defines for Huge page support parisc: Drop unused MADV_xxxK_PAGES flags from asm/mman.h parisc: Drop definition of start_thread_som for HP-UX SOM binaries parisc: Fix wrong comment regarding first pmd entry flags

parisc: Map kernel text and data on huge pages

2015-11-22T11:23:19Z

Adjust the linker script and map_pages() to map kernel text and data on physical 1MB huge/large pages. Signed-off-by: Helge Deller

parisc: Add Huge Page and HUGETLBFS support

2015-11-22T11:23:10Z

This patch adds huge page support to allow userspace to allocate huge pages and to use hugetlbfs filesystem on 32- and 64-bit Linux kernels. A later patch will add kernel support to map kernel text and data on huge pages. The only requirement is, that the kernel needs to be compiled for a PA8X00 CPU (PA2.0 architecture). Older PA1.X CPUs do not support variable page sizes. 64bit Kernels are compiled for PA2.0 by default. Technically on parisc multiple physical huge pages may be needed to emulate standard 2MB huge pages. Signed-off-by: Helge Deller

parisc: Fixes and cleanups in kernel uapi header files

2015-11-08T19:27:01Z

This patch fixes some bugs and partly cleans up the parisc uapi header files to what glibc defined: - compat_semid64_ds was wrong and did not take the endianess into account - ipc64_perm exported userspace types which broke building userspace packages on debian (e.g. trinity) - ipc64_perm needs to use a 32bit mode_t on 64bit kernel - msqid64_ds and semid64_ds needs unsigned longs for various struct members - shmid64_ds exported size_t instead of __kernel_size_t And finally add some compile-time checks for the sizes of those structs to avoid future breakage. Runtime-tested with the Linux Test Project (LTP) testsuite. Cc: # 3.18+ Reviewed-by: Arnd Bergmann Signed-off-by: Helge Deller

parisc: Additionally check for in_atomic() in page fault handler

2015-09-08T13:30:56Z

Craig Estey noticed that we didn't checked for in_atomic() in our page fault handler like other architectures. This commit adds this check by using faulthandler_disabled() which includes a check for pagefault_disabled() and in_atomic(). Reported-by: Craig Estey Signed-off-by: Helge Deller

mm/fault, arch: Use pagefault_disable() to check for disabled pagefaults in the handler

2015-05-19T06:39:15Z

Introduce faulthandler_disabled() and use it to check for irq context and disabled pagefaults (via pagefault_disable()) in the pagefault handlers. Please note that we keep the in_atomic() checks in place - to detect whether in irq context (in which case preemption is always properly disabled). In contrast, preempt_disable() should never be used to disable pagefaults. With !CONFIG_PREEMPT_COUNT, preempt_disable() doesn't modify the preempt counter, and therefore the result of in_atomic() differs. We validate that condition by using might_fault() checks when calling might_sleep(). Therefore, add a comment to faulthandler_disabled(), describing why this is needed. faulthandler_disabled() and pagefault_disable() are defined in linux/uaccess.h, so let's properly add that include to all relevant files. This patch is based on a patch from Thomas Gleixner. Reviewed-and-tested-by: Thomas Gleixner Signed-off-by: David Hildenbrand Signed-off-by: Peter Zijlstra (Intel) Cc: David.Laight@ACULAB.COM Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: airlied@linux.ie Cc: akpm@linux-foundation.org Cc: benh@kernel.crashing.org Cc: bigeasy@linutronix.de Cc: borntraeger@de.ibm.com Cc: daniel.vetter@intel.com Cc: heiko.carstens@de.ibm.com Cc: herbert@gondor.apana.org.au Cc: hocko@suse.cz Cc: hughd@google.com Cc: mst@redhat.com Cc: paulus@samba.org Cc: ralf@linux-mips.org Cc: schwidefsky@de.ibm.com Cc: yang.shi@windriver.com Link: http://lkml.kernel.org/r/1431359540-32227-7-git-send-email-dahi@linux.vnet.ibm.com Signed-off-by: Ingo Molnar

parisc: expose number of page table levels on Kconfig level

2015-04-14T23:49:02Z

We would want to use number of page table level to define mm_struct. Let's expose it as CONFIG_PGTABLE_LEVELS. Signed-off-by: Kirill A. Shutemov Cc: "James E.J. Bottomley" Cc: Helge Deller Tested-by: Guenter Roeck Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

parisc: hpux - Remove hpux gateway page

2015-02-16T21:35:06Z

Drop code to create HP-UX gateway page and syscall entry code. Signed-off-by: Helge Deller