kernel/arch/arm64/include/asm/Kbuild, branch linux-5.1.y

arm64: preempt: Provide our own implementation of asm/preempt.h

2018-12-07T12:35:53Z

The asm-generic/preempt.h implementation doesn't make use of the PREEMPT_NEED_RESCHED flag, since this can interact badly with load/store architectures which rely on the preempt_count word being unchanged across an interrupt. However, since we're a 64-bit architecture and the preempt count is only 32 bits wide, we can simply pack it next to the resched flag and load the whole thing in one go, so that a dec-and-test operation doesn't need to load twice. Acked-by: Peter Zijlstra (Intel) Reviewed-by: Ard Biesheuvel Signed-off-by: Will Deacon

arm64: crypto: add NEON accelerated XOR implementation

2018-12-06T16:47:06Z

This is a NEON acceleration method that can improve performance by approximately 20%. I got the following data from the centos 7.5 on Huawei's HISI1616 chip: [ 93.837726] xor: measuring software checksum speed [ 93.874039] 8regs : 7123.200 MB/sec [ 93.914038] 32regs : 7180.300 MB/sec [ 93.954043] arm64_neon: 9856.000 MB/sec [ 93.954047] xor: using function: arm64_neon (9856.000 MB/sec) I believe this code can bring some optimization for all arm64 platform. thanks for Ard Biesheuvel's suggestions. Signed-off-by: Jackie Liu Reviewed-by: Ard Biesheuvel Signed-off-by: Will Deacon

arm64: locking: Replace ticket lock implementation with qspinlock

2018-07-05T09:05:06Z

It's fair to say that our ticket lock has served us well over time, but it's time to bite the bullet and start using the generic qspinlock code so we can make use of explicit MCS queuing and potentially better PV performance in future. Signed-off-by: Will Deacon

arch: Remove clkdev.h asm-generic from Kbuild

2018-01-03T17:02:11Z

Now that every architecture is using the generic clkdev.h file and we no longer include asm/clkdev.h anywhere in the tree, we can remove it. Cc: Russell King Acked-by: Arnd Bergmann Cc: Acked-by: Geert Uytterhoeven [m68k] Signed-off-by: Stephen Boyd

locking/qrwlock, arm64: Move rwlock implementation over to qrwlocks

2017-10-25T08:57:25Z

Now that the qrwlock can make use of WFE, remove our homebrewed rwlock code in favour of the generic queued implementation. Tested-by: Waiman Long Tested-by: Jeremy Linton Tested-by: Adam Wallis Tested-by: Jan Glauber Signed-off-by: Will Deacon Acked-by: Peter Zijlstra Cc: Jeremy.Linton@arm.com Cc: Linus Torvalds Cc: Thomas Gleixner Cc: boqun.feng@gmail.com Cc: linux-arm-kernel@lists.infradead.org Cc: paulmck@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1507810851-306-5-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar

arm64: neon: replace generic definition of may_use_simd()

2017-08-04T14:00:47Z

In preparation of modifying the logic that decides whether kernel mode NEON is allowable, which is required for SVE support, introduce an implementation of may_use_simd() that reflects the current reality, i.e., that SIMD is allowed in any context. Signed-off-by: Ard Biesheuvel Reviewed-by: Dave Martin Signed-off-by: Catalin Marinas

arm64: move generic-y of exported headers to uapi/asm/Kbuild

2017-07-09T18:43:20Z

Since commit fcc8487d477a ("uapi: export all headers under uapi directories"), all (and only) headers under uapi directories are exported, but asm-generic wrappers are still exceptions. To complete de-coupling the uapi from kernel headers, move generic-y of exported headers to uapi/asm/Kbuild. With this change, "make headers_install" will just need to parse uapi/asm/Kbuild to build up exported headers. For arm64, "generic-y += kvm_para.h" is doubled in asm/Kbuild and uapi/asm/Kbuild. So, the one in the former can be simply removed. Signed-off-by: Masahiro Yamada Acked-by: Catalin Marinas

treewide: move set_memory_* functions away from cacheflush.h

2017-05-09T00:15:13Z

Patch series "set_memory_* functions header refactor", v3. The set_memory_* APIs came out of a desire to have a better way to change memory attributes. Many of these attributes were linked to cache functionality so the prototypes were put in cacheflush.h. These days, the APIs have grown and have a much wider use than just cache APIs. To support this growth, split off set_memory_* and friends into a separate header file to avoid growing cacheflush.h for APIs that have nothing to do with caches. Link: http://lkml.kernel.org/r/1488920133-27229-2-git-send-email-labbott@redhat.com Signed-off-by: Laura Abbott Acked-by: Russell King Acked-by: Mark Rutland Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

sched/cputime: Remove generic asm headers

2017-02-01T08:14:07Z

cputime_t is now only used by two architectures: * powerpc (when CONFIG_VIRT_CPU_ACCOUNTING_NATIVE=y) * s390 And since the core doesn't use it anymore, we don't need any arch support from the others. So we can remove their stub implementations. A final cleanup would be to provide an efficient pure arch implementation of cputime_to_nsec() for s390 and powerpc and finally remove include/linux/cputime.h . Signed-off-by: Frederic Weisbecker Cc: Benjamin Herrenschmidt Cc: Fenghua Yu Cc: Heiko Carstens Cc: Linus Torvalds Cc: Martin Schwidefsky Cc: Michael Ellerman Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Rik van Riel Cc: Stanislaw Gruszka Cc: Thomas Gleixner Cc: Tony Luck Cc: Wanpeng Li Link: http://lkml.kernel.org/r/1485832191-26889-36-git-send-email-fweisbec@gmail.com Signed-off-by: Ingo Molnar

Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

2016-12-14T00:39:21Z

Pull arm64 updates from Catalin Marinas: - struct thread_info moved off-stack (also touching include/linux/thread_info.h and include/linux/restart_block.h) - cpus_have_cap() reworked to avoid __builtin_constant_p() for static key use (also touching drivers/irqchip/irq-gic-v3.c) - uprobes support (currently only for native 64-bit tasks) - Emulation of kernel Privileged Access Never (PAN) using TTBR0_EL1 switching to a reserved page table - CPU capacity information passing via DT or sysfs (used by the scheduler) - support for systems without FP/SIMD (IOW, kernel avoids touching these registers; there is no soft-float ABI, nor kernel emulation for AArch64 FP/SIMD) - handling of hardware watchpoint with unaligned addresses, varied lengths and offsets from base - use of the page table contiguous hint for kernel mappings - hugetlb fixes for sizes involving the contiguous hint - remove unnecessary I-cache invalidation in flush_cache_range() - CNTHCTL_EL2 access fix for CPUs with VHE support (ARMv8.1) - boot-time checks for writable+executable kernel mappings - simplify asm/opcodes.h and avoid including the 32-bit ARM counterpart and make the arm64 kernel headers self-consistent (Xen headers patch merged separately) - Workaround for broken .inst support in certain binutils versions * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (60 commits) arm64: Disable PAN on uaccess_enable() arm64: Work around broken .inst when defective gas is detected arm64: Add detection code for broken .inst support in binutils arm64: Remove reference to asm/opcodes.h arm64: Get rid of asm/opcodes.h arm64: smp: Prevent raw_smp_processor_id() recursion arm64: head.S: Fix CNTHCTL_EL2 access on VHE system arm64: Remove I-cache invalidation from flush_cache_range() arm64: Enable HIBERNATION in defconfig arm64: Enable CONFIG_ARM64_SW_TTBR0_PAN arm64: xen: Enable user access before a privcmd hvc call arm64: Handle faults caused by inadvertent user access with PAN enabled arm64: Disable TTBR0_EL1 during normal kernel execution arm64: Introduce uaccess_{disable,enable} functionality based on TTBR0_EL1 arm64: Factor out TTBR0_EL1 post-update workaround into a specific asm macro arm64: Factor out PAN enabling/disabling into separate uaccess_* macros arm64: Update the synchronous external abort fault description selftests: arm64: add test for unaligned/inexact watchpoint handling arm64: Allow hw watchpoint of length 3,5,6 and 7 arm64: hw_breakpoint: Handle inexact watchpoint addresses ...