From nobody Mon Apr 13 13:31:06 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9B1EAC19F2A for ; Wed, 10 Aug 2022 15:21:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233217AbiHJPVc (ORCPT ); Wed, 10 Aug 2022 11:21:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37522 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233208AbiHJPVH (ORCPT ); Wed, 10 Aug 2022 11:21:07 -0400 Received: from mail-pf1-x44a.google.com (mail-pf1-x44a.google.com [IPv6:2607:f8b0:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A56D352DE4 for ; Wed, 10 Aug 2022 08:20:54 -0700 (PDT) Received: by mail-pf1-x44a.google.com with SMTP id v65-20020a626144000000b0052f89472f54so3272470pfb.11 for ; Wed, 10 Aug 2022 08:20:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc; bh=ZH7CdRWCIwNg0rfB6pUeUyBV2qfCWplRtlLFdh/iMUI=; b=apwXC/ww4j5CUuVFoJyNaoq+BSpD4U+4DscUXqUrLk78d+ARYidpwEa5ihZfml/1pS RF9y0n45tYrpC3MIhhZk0erLNzoxOIB7yzKbM9hLF4yWG1H6+9Be3jII4QPCzX71NspY 8ER7PYUunxvMsZrp0iN+lF1j90zPZWLsyqTjoMMP+PVuK77dG36lodOSzGEJgc44BByN tMp2OicDylCbNQIB+0UYfBDeESFY7Ao0DoUwQ8bcyxrduRXq6sMIbzo34wx5Hsjgwe+l Rh0mEqgTh4Trsb8m8VoKxipFaGY2oEPhPnr0B4daIm7vKJzhcnby9pV09OHAUFyG4oEQ zHgw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc; bh=ZH7CdRWCIwNg0rfB6pUeUyBV2qfCWplRtlLFdh/iMUI=; b=SN9N+ukAgjrDXGnar85IdVfxd9mThVISmi8toeagD9rZhCpDiPTSKViJ6zyS0blA/J HBf5s6TJ9Aayucrg+OuoJ3y5fLkWObxrfMHM9s1sG9Hnw/E+5BZpHe/2226wBSJJ5Vk6 iVq3laRYRUjWaSNg33T+Row2oX8i7otcCGnpK0RFH/VV+9n+xl2T9WoHkMahByduXDTK LpzfU8Azwrhg7WIfE0Nf5KpIQWvJGVCxNSubXmD0VkSH6fGhJONlbYeu9anjvzKg+Zmg LwgZ/MXfItzEgEDSCp3pi5nThp7HDs0/TDj82WD3vKSmOYzHKf346TGmq747NVEw/inn De9g== X-Gm-Message-State: ACgBeo30ZGxyoMQT0xkyUxcMU+Uzv/0+3ZobbD52M+hZpKBDlHCgKYLj pIUadS07npENGtzg3X2Z/OqDvL/nv1s= X-Google-Smtp-Source: AA6agR7/peE3sNp+8R/sQNztbFbtY9gi/ShTyBHi6GxvE2QcV08n2v2+coOQi5Gc9nYsEInoAH6es2+2RJY= X-Received: from pgonda1.kir.corp.google.com ([2620:15c:29:203:b185:1827:5b23:bbe2]) (user=pgonda job=sendgmr) by 2002:a63:6cc4:0:b0:41a:ff04:661f with SMTP id h187-20020a636cc4000000b0041aff04661fmr23530639pgc.600.1660144853502; Wed, 10 Aug 2022 08:20:53 -0700 (PDT) Date: Wed, 10 Aug 2022 08:20:31 -0700 In-Reply-To: <20220810152033.946942-1-pgonda@google.com> Message-Id: <20220810152033.946942-10-pgonda@google.com> Mime-Version: 1.0 References: <20220810152033.946942-1-pgonda@google.com> X-Mailer: git-send-email 2.37.1.559.g78731f0fdb-goog Subject: [V3 09/11] tools: Add atomic_test_and_set_bit() From: Peter Gonda To: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, marcorr@google.com, seanjc@google.com, michael.roth@amd.com, thomas.lendacky@amd.com, joro@8bytes.org, mizhang@google.com, pbonzini@redhat.com, andrew.jones@linux.dev, vannapurve@google.com, Peter Gonda Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" atomic_test_and_set_bit() allows for atomic bitmap usage from KVM selftests. Signed-off-by: Peter Gonda Suggested-by: Sean Christopherson --- tools/arch/x86/include/asm/atomic.h | 7 +++++++ tools/include/asm-generic/atomic-gcc.h | 15 +++++++++++++++ 2 files changed, 22 insertions(+) diff --git a/tools/arch/x86/include/asm/atomic.h b/tools/arch/x86/include/a= sm/atomic.h index 1f5e26aae9fc..01cc27ec4520 100644 --- a/tools/arch/x86/include/asm/atomic.h +++ b/tools/arch/x86/include/asm/atomic.h @@ -8,6 +8,7 @@ =20 #define LOCK_PREFIX "\n\tlock; " =20 +#include #include =20 /* @@ -70,4 +71,10 @@ static __always_inline int atomic_cmpxchg(atomic_t *v, i= nt old, int new) return cmpxchg(&v->counter, old, new); } =20 +static inline int atomic_test_and_set_bit(long nr, unsigned long *addr) +{ + GEN_BINARY_RMWcc(LOCK_PREFIX __ASM_SIZE(bts), *addr, "Ir", nr, "%0", "c"); + +} + #endif /* _TOOLS_LINUX_ASM_X86_ATOMIC_H */ diff --git a/tools/include/asm-generic/atomic-gcc.h b/tools/include/asm-gen= eric/atomic-gcc.h index 4c1966f7c77a..8d9b2d1768bf 100644 --- a/tools/include/asm-generic/atomic-gcc.h +++ b/tools/include/asm-generic/atomic-gcc.h @@ -4,6 +4,7 @@ =20 #include #include +#include =20 /* * Atomic operations that C can't guarantee us. Useful for @@ -69,4 +70,18 @@ static inline int atomic_cmpxchg(atomic_t *v, int oldval= , int newval) return cmpxchg(&(v)->counter, oldval, newval); } =20 +static inline int atomic_test_and_set_bit(long nr, unsigned long *addr) +{ + long old, val; + unsigned long mask =3D BIT_MASK(nr); + + addr +=3D BIT_WORD(nr); + val =3D READ_ONCE(*addr); + if (val & mask) + return 1; + + old =3D cmpxchg(addr, val, val & mask); + return !!(old & mask); +} + #endif /* __TOOLS_ASM_GENERIC_ATOMIC_H */ --=20 2.37.1.559.g78731f0fdb-goog