linux-arm.git - Russell King's ARM Linux kernel tree

Age	Commit message (Collapse)	Author
2021-12-07	locking: Allow to include asm/spinlock_types.h from linux/spinlock_types_raw.h	Sebastian Andrzej Siewior
	The printk header file includes ratelimit_types.h for its __ratelimit() based usage. It is required for the static initializer used in printk_ratelimited(). It uses a raw_spinlock_t and includes the spinlock_types.h. PREEMPT_RT substitutes spinlock_t with a rtmutex based implementation and so its spinlock_t implmentation (provided by spinlock_rt.h) includes rtmutex.h and atomic.h which leads to recursive includes where defines are missing. By including only the raw_spinlock_t defines it avoids the atomic.h related includes at this stage. An example on powerpc: \| CALL scripts/atomic/check-atomics.sh \|In file included from include/linux/bug.h:5, \| from include/linux/page-flags.h:10, \| from kernel/bounds.c:10: \|arch/powerpc/include/asm/page_32.h: In function âclear_pageâ: \|arch/powerpc/include/asm/bug.h:87:4: error: implicit declaration of function â=80=98__WARNâ=80=99 [-Werror=3Dimplicit-function-declaration] \| 87 \| __WARN(); \ \| \| ^~~~~~ \|arch/powerpc/include/asm/page_32.h:48:2: note: in expansion of macro âWARN_ONâ=99 \| 48 \| WARN_ON((unsigned long)addr & (L1_CACHE_BYTES - 1)); \| \| ^~~~~~~ \|arch/powerpc/include/asm/bug.h:58:17: error: invalid application of âsizeofâ=99 to incomplete type âstruct bug_entryâ=99 \| 58 \| "i" (sizeof(struct bug_entry)), \ \| \| ^~~~~~ \|arch/powerpc/include/asm/bug.h:89:3: note: in expansion of macro âBUG_ENTRYâ=99 \| 89 \| BUG_ENTRY(PPC_TLNEI " %4, 0", \ \| \| ^~~~~~~~~ \|arch/powerpc/include/asm/page_32.h:48:2: note: in expansion of macro âWARN_ONâ=99 \| 48 \| WARN_ON((unsigned long)addr & (L1_CACHE_BYTES - 1)); \| \| ^~~~~~~ \|In file included from arch/powerpc/include/asm/ptrace.h:298, \| from arch/powerpc/include/asm/hw_irq.h:12, \| from arch/powerpc/include/asm/irqflags.h:12, \| from include/linux/irqflags.h:16, \| from include/asm-generic/cmpxchg-local.h:6, \| from arch/powerpc/include/asm/cmpxchg.h:526, \| from arch/powerpc/include/asm/atomic.h:11, \| from include/linux/atomic.h:7, \| from include/linux/rwbase_rt.h:6, \| from include/linux/rwlock_types.h:55, \| from include/linux/spinlock_types.h:74, \| from include/linux/ratelimit_types.h:7, \| from include/linux/printk.h:10, \| from include/asm-generic/bug.h:22, \| from arch/powerpc/include/asm/bug.h:109, \| from include/linux/bug.h:5, \| from include/linux/page-flags.h:10, \| from kernel/bounds.c:10: \|include/linux/thread_info.h: In function â=80=98copy_overflowâ=80=99: \|include/linux/thread_info.h:210:2: error: implicit declaration of function â=80=98WARNâ=80=99 [-Werror=3Dimplicit-function-declaration] \| 210 \| WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count); \| \| ^~~~ The WARN / BUG include pulls in printk.h and then ptrace.h expects WARN (from bug.h) which is not yet complete. Even hw_irq.h has WARN_ON() statements. On POWERPC64 there are missing atomic64 defines while building 32bit VDSO: \| VDSO32C arch/powerpc/kernel/vdso32/vgettimeofday.o \|In file included from include/linux/atomic.h:80, \| from include/linux/rwbase_rt.h:6, \| from include/linux/rwlock_types.h:55, \| from include/linux/spinlock_types.h:74, \| from include/linux/ratelimit_types.h:7, \| from include/linux/printk.h:10, \| from include/linux/kernel.h:19, \| from arch/powerpc/include/asm/page.h:11, \| from arch/powerpc/include/asm/vdso/gettimeofday.h:5, \| from include/vdso/datapage.h:137, \| from lib/vdso/gettimeofday.c:5, \| from <command-line>: \|include/linux/atomic-arch-fallback.h: In function âarch_atomic64_incâ=99: \|include/linux/atomic-arch-fallback.h:1447:2: error: implicit declaration of function âarch_atomic64_addâ; did you mean âarch_atomic_addâ? [-Werror=3Dimpl \|icit-function-declaration] \| 1447 \| arch_atomic64_add(1, v); \| \| ^~~~~~~~~~~~~~~~~ \| \| arch_atomic_add The generic fallback is not included, atomics itself are not used. If kernel.h does not include printk.h then it comes later from the bug.h include. Allow asm/spinlock_types.h to be included from linux/spinlock_types_raw.h. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20211129174654.668506-12-bigeasy@linutronix.de
2019-06-19	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234	Thomas Gleixner
	Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 503 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-07-05	arm64: locking: Replace ticket lock implementation with qspinlock	Will Deacon
	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 <will.deacon@arm.com>
2017-10-25	locking/qrwlock, arm64: Move rwlock implementation over to qrwlocks	Will Deacon
	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 <longman@redhat.com> Tested-by: Jeremy Linton <jeremy.linton@arm.com> Tested-by: Adam Wallis <awallis@codeaurora.org> Tested-by: Jan Glauber <jglauber@cavium.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Jeremy.Linton@arm.com Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> 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 <mingo@kernel.org>
2015-07-27	arm64: include linux/types.h in asm/spinlock_types.h	Will Deacon
	Our ticket-based spinlock structures rely on a definition of u16, so include linux/types.h explicitly to ensure the thing compiles. Found by a module build failure in -next: arch/arm64/include/asm/spinlock_types.h:27:2: error: unknown type name 'u16' arch/arm64/include/asm/spinlock_types.h:28:2: error: unknown type name 'u16' arch/arm64/include/asm/spinlock_types.h:33:13: error: expected declaration specifiers or '...' before numeric constant include/linux/spinlock_types.h:21:2: error: unknown type name 'arch_spinlock_t' arch/arm64/include/asm/spinlock.h:34:35: error: unknown type name 'arch_spinlock_t' arch/arm64/include/asm/spinlock.h:65:37: error: unknown type name 'arch_spinlock_t' Reported-by: Russell King <linux@arm.linux.org.uk> Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-10-25	arm64: Fix the endianness of arch_spinlock_t	Catalin Marinas
	The owner and next members of the arch_spinlock_t structure need to be swapped when compiling for big endian. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reported-by: Matthew Leach <matthew.leach@arm.com> Acked-by: Will Deacon <will.deacon@arm.com>
2013-10-24	arm64: locks: introduce ticket-based spinlock implementation	Will Deacon
	This patch introduces a ticket lock implementation for arm64, along the same lines as the implementation for arch/arm/. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-09-17	arm64: SMP support	Catalin Marinas
	This patch adds SMP initialisation and spinlocks implementation for AArch64. The spinlock support uses the new load-acquire/store-release instructions to avoid explicit barriers. The architecture also specifies that an event is automatically generated when clearing the exclusive monitor state to wake up processors in WFE, so there is no need for an explicit DSB/SEV instruction sequence. The SEVL instruction is used to set the exclusive monitor locally as there is no conditional WFE and a branch is more expensive. For the SMP booting protocol, see Documentation/arm64/booting.txt. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>