From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Hildenbrand Subject: [kvm-unit-tests PATCH v1 1/3] lib: provide generic spinlock Date: Fri, 12 May 2017 12:20:40 +0200 Message-ID: <20170512102042.4956-2-david@redhat.com> References: <20170512102042.4956-1-david@redhat.com> Cc: Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Thomas Huth , david@redhat.com, Laurent Vivier , kvm-ppc@vger.kernel.org To: kvm@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:45958 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756428AbdELKUx (ORCPT ); Fri, 12 May 2017 06:20:53 -0400 In-Reply-To: <20170512102042.4956-1-david@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: Let's provide a basic lock implementation that should work on most architectures. Signed-off-by: David Hildenbrand --- lib/asm-generic/spinlock.h | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/lib/asm-generic/spinlock.h b/lib/asm-generic/spinlock.h index 3141744..e8c3a58 100644 --- a/lib/asm-generic/spinlock.h +++ b/lib/asm-generic/spinlock.h @@ -1,4 +1,18 @@ #ifndef _ASM_GENERIC_SPINLOCK_H_ #define _ASM_GENERIC_SPINLOCK_H_ -#error need architecture specific asm/spinlock.h + +struct spinlock { + unsigned int v; +}; + +static inline void spin_lock(struct spinlock *lock) +{ + while (!__sync_bool_compare_and_swap(&lock->v, 0, 1)); +} + +static inline void spin_unlock(struct spinlock *lock) +{ + __sync_bool_compare_and_swap(&lock->v, 1, 0); +} + #endif -- 2.9.3