kernel.git/arch/hexagon/kernel, branch linux-5.12.y

hexagon: use common DISCARDS macro

2021-07-20T14:02:22Z

[ Upstream commit 681ba73c72302214686401e707e2087ed11a6556 ] ld.lld warns that the '.modinfo' section is not currently handled: ld.lld: warning: kernel/built-in.a(workqueue.o):(.modinfo) is being placed in '.modinfo' ld.lld: warning: kernel/built-in.a(printk/printk.o):(.modinfo) is being placed in '.modinfo' ld.lld: warning: kernel/built-in.a(irq/spurious.o):(.modinfo) is being placed in '.modinfo' ld.lld: warning: kernel/built-in.a(rcu/update.o):(.modinfo) is being placed in '.modinfo' The '.modinfo' section was added in commit 898490c010b5 ("moduleparam: Save information about built-in modules in separate file") to the DISCARDS macro but Hexagon has never used that macro. The unification of DISCARDS happened in commit 023bf6f1b8bf ("linker script: unify usage of discard definition") in 2009, prior to Hexagon being added in 2011. Switch Hexagon over to the DISCARDS macro so that anything that is expected to be discarded gets discarded. Link: https://lkml.kernel.org/r/20210521011239.1332345-3-nathan@kernel.org Fixes: e95bf452a9e2 ("Hexagon: Add configuration and makefiles for the Hexagon architecture.") Signed-off-by: Nathan Chancellor Reviewed-by: Nick Desaulniers Acked-by: Brian Cain Cc: David Rientjes Cc: Oliver Glitta Cc: Vlastimil Babka Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin

hexagon: handle {,SOFT}IRQENTRY_TEXT in linker script

2021-07-20T14:02:22Z

[ Upstream commit 6fef087d0d37ba7dba8f3d75566eb4c256cd6742 ] Patch series "hexagon: Fix build error with CONFIG_STACKDEPOT and select CONFIG_ARCH_WANT_LD_ORPHAN_WARN". This series fixes an error with ARCH=hexagon that was pointed out by the patch "mm/slub: use stackdepot to save stack trace in objects". The first patch fixes that error by handling the '.irqentry.text' and '.softirqentry.text' sections. The second patch switches Hexagon over to the common DISCARDS macro, which should have been done when Hexagon was merged into the tree to match commit 023bf6f1b8bf ("linker script: unify usage of discard definition"). The third patch selects CONFIG_ARCH_WANT_LD_ORPHAN_WARN so that something like this does not happen again. This patch (of 3): Patch "mm/slub: use stackdepot to save stack trace in objects" in -mm selects CONFIG_STACKDEPOT when CONFIG_STACKTRACE_SUPPORT is selected and CONFIG_STACKDEPOT requires IRQENTRY_TEXT and SOFTIRQENTRY_TEXT to be handled after commit 505a0ef15f96 ("kasan: stackdepot: move filter_irq_stacks() to stackdepot.c") due to the use of the __{,soft}irqentry_text_{start,end} section symbols. If those sections are not handled, the build is broken. $ make ARCH=hexagon CROSS_COMPILE=hexagon-linux- LLVM=1 LLVM_IAS=1 defconfig all ... ld.lld: error: undefined symbol: __irqentry_text_start >>> referenced by stackdepot.c >>> stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a >>> referenced by stackdepot.c >>> stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a ld.lld: error: undefined symbol: __irqentry_text_end >>> referenced by stackdepot.c >>> stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a >>> referenced by stackdepot.c >>> stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a ld.lld: error: undefined symbol: __softirqentry_text_start >>> referenced by stackdepot.c >>> stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a >>> referenced by stackdepot.c >>> stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a ld.lld: error: undefined symbol: __softirqentry_text_end >>> referenced by stackdepot.c >>> stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a >>> referenced by stackdepot.c >>> stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a ... Add these sections to the Hexagon linker script so the build continues to work. ld.lld's orphan section warning would have caught this prior to the -mm commit mentioned above: ld.lld: warning: kernel/built-in.a(softirq.o):(.softirqentry.text) is being placed in '.softirqentry.text' ld.lld: warning: kernel/built-in.a(softirq.o):(.softirqentry.text) is being placed in '.softirqentry.text' ld.lld: warning: kernel/built-in.a(softirq.o):(.softirqentry.text) is being placed in '.softirqentry.text' Link: https://lkml.kernel.org/r/20210521011239.1332345-1-nathan@kernel.org Link: https://lkml.kernel.org/r/20210521011239.1332345-2-nathan@kernel.org Link: https://github.com/ClangBuiltLinux/linux/issues/1381 Fixes: 505a0ef15f96 ("kasan: stackdepot: move filter_irq_stacks() to stackdepot.c") Signed-off-by: Nathan Chancellor Reviewed-by: Nick Desaulniers Acked-by: Brian Cain Cc: Oliver Glitta Cc: Vlastimil Babka Cc: David Rientjes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin

Hexagon: add target builtins to kernel

2021-07-11T10:56:05Z

commit f1f99adf05f2138ff2646d756d4674e302e8d02d upstream. Add the compiler-rt builtins like memcpy to the hexagon kernel. Signed-off-by: Sid Manning Add SYM_FUNC_START/END, ksyms exports Signed-off-by: Brian Cain Cc: Guenter Roeck Tested-by: Nick Desaulniers Signed-off-by: Greg Kroah-Hartman

Hexagon: fix build errors

2021-07-11T10:56:05Z

commit 788dcee0306e1bdbae1a76d1b3478bb899c5838e upstream. Fix type-o in ptrace.c. Add missing include: asm/hexagon_vm.h Remove superfluous cast. Replace 'p3_0' with 'preds'. Signed-off-by: Sid Manning Add -mlong-calls to build flags. Signed-off-by: Brian Cain Tested-by: Nick Desaulniers Reviewed-by: Nick Desaulniers Cc: Guenter Roeck Signed-off-by: Greg Kroah-Hartman

arch: setup PF_IO_WORKER threads like PF_KTHREAD

2021-02-22T00:25:22Z

PF_IO_WORKER are kernel threads too, but they aren't PF_KTHREAD in the sense that we don't assign ->set_child_tid with our own structure. Just ensure that every arch sets up the PF_IO_WORKER threads like kthreads in the arch implementation of copy_thread(). Signed-off-by: Jens Axboe

Merge tag 'tif-task_work.arch-2020-12-14' of git://git.kernel.dk/linux-block

2020-12-16T20:33:35Z

Pull TIF_NOTIFY_SIGNAL updates from Jens Axboe: "This sits on top of of the core entry/exit and x86 entry branch from the tip tree, which contains the generic and x86 parts of this work. Here we convert the rest of the archs to support TIF_NOTIFY_SIGNAL. With that done, we can get rid of JOBCTL_TASK_WORK from task_work and signal.c, and also remove a deadlock work-around in io_uring around knowing that signal based task_work waking is invoked with the sighand wait queue head lock. The motivation for this work is to decouple signal notify based task_work, of which io_uring is a heavy user of, from sighand. The sighand lock becomes a huge contention point, particularly for threaded workloads where it's shared between threads. Even outside of threaded applications it's slower than it needs to be. Roman Gershman reported that his networked workload dropped from 1.6M QPS at 80% CPU to 1.0M QPS at 100% CPU after io_uring was changed to use TIF_NOTIFY_SIGNAL. The time was all spent hammering on the sighand lock, showing 57% of the CPU time there [1]. There are further cleanups possible on top of this. One example is TIF_PATCH_PENDING, where a patch already exists to use TIF_NOTIFY_SIGNAL instead. Hopefully this will also lead to more consolidation, but the work stands on its own as well" [1] https://github.com/axboe/liburing/issues/215 * tag 'tif-task_work.arch-2020-12-14' of git://git.kernel.dk/linux-block: (28 commits) io_uring: remove 'twa_signal_ok' deadlock work-around kernel: remove checking for TIF_NOTIFY_SIGNAL signal: kill JOBCTL_TASK_WORK io_uring: JOBCTL_TASK_WORK is no longer used by task_work task_work: remove legacy TWA_SIGNAL path sparc: add support for TIF_NOTIFY_SIGNAL riscv: add support for TIF_NOTIFY_SIGNAL nds32: add support for TIF_NOTIFY_SIGNAL ia64: add support for TIF_NOTIFY_SIGNAL h8300: add support for TIF_NOTIFY_SIGNAL c6x: add support for TIF_NOTIFY_SIGNAL alpha: add support for TIF_NOTIFY_SIGNAL xtensa: add support for TIF_NOTIFY_SIGNAL arm: add support for TIF_NOTIFY_SIGNAL microblaze: add support for TIF_NOTIFY_SIGNAL hexagon: add support for TIF_NOTIFY_SIGNAL csky: add support for TIF_NOTIFY_SIGNAL openrisc: add support for TIF_NOTIFY_SIGNAL sh: add support for TIF_NOTIFY_SIGNAL um: add support for TIF_NOTIFY_SIGNAL ...

sched/idle: Fix arch_cpu_idle() vs tracing

2020-11-24T15:47:35Z

We call arch_cpu_idle() with RCU disabled, but then use local_irq_{en,dis}able(), which invokes tracing, which relies on RCU. Switch all arch_cpu_idle() implementations to use raw_local_irq_{en,dis}able() and carefully manage the lockdep,rcu,tracing state like we do in entry. (XXX: we really should change arch_cpu_idle() to not return with interrupts enabled) Reported-by: Sven Schnelle Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Mark Rutland Tested-by: Mark Rutland Link: https://lkml.kernel.org/r/20201120114925.594122626@infradead.org

hexagon: add support for TIF_NOTIFY_SIGNAL

2020-11-09T15:16:55Z

Wire up TIF_NOTIFY_SIGNAL handling for hexagon. Cc: linux-hexagon@vger.kernel.org Acked-by: Brian Cain Signed-off-by: Jens Axboe

tracehook: clear TIF_NOTIFY_RESUME in tracehook_notify_resume()

2020-10-17T21:04:36Z

All the callers currently do this, clean it up and move the clearing into tracehook_notify_resume() instead. Reviewed-by: Oleg Nesterov Reviewed-by: Thomas Gleixner Signed-off-by: Jens Axboe

Merge tag 'dma-mapping-5.10' of git://git.infradead.org/users/hch/dma-mapping

2020-10-15T21:43:29Z

Pull dma-mapping updates from Christoph Hellwig: - rework the non-coherent DMA allocator - move private definitions out of - lower CMA_ALIGNMENT (Paul Cercueil) - remove the omap1 dma address translation in favor of the common code - make dma-direct aware of multiple dma offset ranges (Jim Quinlan) - support per-node DMA CMA areas (Barry Song) - increase the default seg boundary limit (Nicolin Chen) - misc fixes (Robin Murphy, Thomas Tai, Xu Wang) - various cleanups * tag 'dma-mapping-5.10' of git://git.infradead.org/users/hch/dma-mapping: (63 commits) ARM/ixp4xx: add a missing include of dma-map-ops.h dma-direct: simplify the DMA_ATTR_NO_KERNEL_MAPPING handling dma-direct: factor out a dma_direct_alloc_from_pool helper dma-direct check for highmem pages in dma_direct_alloc_pages dma-mapping: merge into dma-mapping: move large parts of to kernel/dma dma-mapping: move dma-debug.h to kernel/dma/ dma-mapping: remove dma-mapping: merge into dma-contiguous: remove dma_contiguous_set_default dma-contiguous: remove dev_set_cma_area dma-contiguous: remove dma_declare_contiguous dma-mapping: split cma: decrease CMA_ALIGNMENT lower limit to 2 firewire-ohci: use dma_alloc_pages dma-iommu: implement ->alloc_noncoherent dma-mapping: add new {alloc,free}_noncoherent dma_map_ops methods dma-mapping: add a new dma_alloc_pages API dma-mapping: remove dma_cache_sync 53c700: convert to dma_alloc_noncoherent ...