From nobody Wed Dec 17 00:36:34 2025 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 EC2FFCDB47E for ; Thu, 12 Oct 2023 20:18:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1442715AbjJLUSG (ORCPT ); Thu, 12 Oct 2023 16:18:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52196 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344109AbjJLUSB (ORCPT ); Thu, 12 Oct 2023 16:18:01 -0400 Received: from mail-ej1-x62e.google.com (mail-ej1-x62e.google.com [IPv6:2a00:1450:4864:20::62e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BEE8ECA for ; Thu, 12 Oct 2023 13:17:58 -0700 (PDT) Received: by mail-ej1-x62e.google.com with SMTP id a640c23a62f3a-9b275afb6abso536715766b.1 for ; Thu, 12 Oct 2023 13:17:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1697141877; x=1697746677; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=ALeoGKxiNsNupqhZSQanqEeTZk7gDRiZ8s33h27zT00=; b=VjQQA2i+25ld5AjYxv18h+nEEzlPthMa1EMjkm+7Kkh8436osYa2j+xkzg1+NFy8W0 Wum2QXGXs2oF+EGm/k5OZ6nPtowqYCbumneeYaBq9+wx1CwSdAwCnQrmNP+x2IiMFcoC LrgYoZXka3SWlCmHe7dFTQ1eTj7hrVduJZh6ijIhwXS6P0iRAxl44ZF3O36AIh5A7Jid Y4oHaH9p8B/bUDPYf8OPFs/50Cgg2Z3kt21jTrtax4bDSxmDgXP0czP4SMTAMybMSsbq ASONUuUUY/Fe77y8yPbnrLxQk5MmqCD9pA1/MuoY2sez9Y7Z4q8z/UxqWbuoHEk8a3Q0 sCCw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697141877; x=1697746677; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=ALeoGKxiNsNupqhZSQanqEeTZk7gDRiZ8s33h27zT00=; b=j1YQfYFg7rj6Nq1e5TD+zsynYpn9Ij4x2HJg3lFSh/45MlXX8nToyh4LJK9xqUH7vP eLUyGzekCetfzDZvXO76eBD2HeRGkDLWB12f5yq9TMnX4xuId8qLL4uoX9HmE2oXGkug 0A9vkEP3+qNo65lITWqSzkYwTrX+96aDV/TLBtSv7epkyAg1QSWzxmYQZ7mqRmrxx13j FlIEBehUnVQXAtEXMmbs4nHxj+KY8csSllwTkyI2vlVZHeV1e+HQKvFllQnQ5QexcOyp cqcgLza7i3WhVEMTifqtHLEg2rOgUVLZxLNrbZgZsNCz3esosNlRx3hxpef6oahY0cni w8hw== X-Gm-Message-State: AOJu0YyWbAGiNyF+SE4+Re0DBsr+zLqFYWLCKlkdVccKun/OYOZmdo6R PrUVKkEcdMi3FlAEv3Dle6w= X-Google-Smtp-Source: AGHT+IGL/aK1BGpYJaP/mMy11SXb55Cywvjox0gtbzUH0yanedqIAwh6/5blT0OJLYZSBuGZJQt9Dw== X-Received: by 2002:a17:907:9715:b0:9ae:705a:8451 with SMTP id jg21-20020a170907971500b009ae705a8451mr21130335ejc.25.1697141877018; Thu, 12 Oct 2023 13:17:57 -0700 (PDT) Received: from localhost.localdomain ([46.248.82.114]) by smtp.gmail.com with ESMTPSA id i3-20020a1709064ec300b00997d7aa59fasm11692552ejv.14.2023.10.12.13.17.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Oct 2023 13:17:56 -0700 (PDT) From: Uros Bizjak To: x86@kernel.org, xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org Cc: Uros Bizjak , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Peter Zijlstra Subject: [PATCH v2 4/4] x86/percpu: Introduce %rip-relative addressing to PER_CPU_VAR macro Date: Thu, 12 Oct 2023 22:12:07 +0200 Message-ID: <20231012201743.292149-5-ubizjak@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231012201743.292149-1-ubizjak@gmail.com> References: <20231012201743.292149-1-ubizjak@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Introduce x86_64 %rip-relative addressing to PER_CPU_VAR macro. Instruction with %rip-relative address operand is one byte shorter than its absolute address counterpart and is also compatible with position independent executable (-fpie) build. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: "H. Peter Anvin" Cc: Peter Zijlstra Signed-off-by: Uros Bizjak --- arch/x86/include/asm/percpu.h | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h index 83e6a4bcea38..c53c5a7f8e78 100644 --- a/arch/x86/include/asm/percpu.h +++ b/arch/x86/include/asm/percpu.h @@ -4,19 +4,21 @@ =20 #ifdef CONFIG_X86_64 #define __percpu_seg gs +#define __percpu_rel (%rip) #else #define __percpu_seg fs +#define __percpu_rel #endif =20 #ifdef __ASSEMBLY__ =20 #ifdef CONFIG_SMP #define PER_CPU_ARG(arg) %__percpu_seg:arg -#define PER_CPU_VAR(var) %__percpu_seg:var +#define PER_CPU_VAR(var) %__percpu_seg:(var)##__percpu_rel #else /* ! SMP */ #define PER_CPU_ARG(arg) arg -#define PER_CPU_VAR(var) var -#endif /* SMP */ +#define PER_CPU_VAR(var) (var)##__percpu_rel +#endif /* SMP */ =20 #ifdef CONFIG_X86_64_SMP #define INIT_PER_CPU_VAR(var) init_per_cpu__##var --=20 2.41.0