From nobody Wed Feb 11 04:18:57 2026 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C425D28376; Sat, 18 May 2024 09:44:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716025496; cv=none; b=FnAN20w7Ab+a4bUm9F5nQt5VUQ/hZ9xGjOnMezEEhtFB8jf0/k4zeGsMx1LspnWnhhSBIy3jkqvWxBD4UflGtCYFI4D2PXBMClerblD8mkqJfqIvAemYFo29dIs4Dnihzkhzrzcjr9e0La/uTku022E5gQJxGBaWTuYuMMrIhjU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716025496; c=relaxed/simple; bh=YnNbaHbLo6hEpCYus0gSKcmmmNiGpYvHLIWFn4j7U1k=; h=Date:From:To:Subject:Cc:In-Reply-To:References:MIME-Version: Message-ID:Content-Type; b=EeKuh8C06yw0XQEeog2LvGRM2PJC08uXggZsGm+glAZLwMYoPluOd69guXOrahr90fLZuvBADJHHvhw6JgCa2mKiIAPHwW5x1ilNEimUNSbezYxyCIqI2tQqnxa50UpVI8AR/pQJW1IdGtXFGnL4LY3nNJDXcxMo9p4gbfdbdhc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=xgU7ciUD; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=JpDmxsTA; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="xgU7ciUD"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="JpDmxsTA" Date: Sat, 18 May 2024 09:44:52 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1716025493; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=MolmMBZt1LO4RiCedTEusJA5MaqJfY9Y/sAo5N3HZuA=; b=xgU7ciUD+TRqjQmg+z0Bze9aKGplO3j9URgi+hP9K0Nx0hhQfJHc3VlqziPOdNhIA/OlLh 2KtUOJvY7ZgCHEWkFDINPQ9rzwsEB3/FqAyTQFrXBdZVRbnbQDu9MOZhtxcLoKSup/2849 FupZL9KX5hnF2MrjEny2mI6KuLmJSfLdG6b6Ys1HQq9j8+9MrUOihxeG4AWHYqu7T6L7WP u7HTCbUroOnGCGLBeUbQWDMj8qB4mGb8UGVtx09FHyPBPpC3Z0d4dFIdj2eiqvUb15ItSa 6ohtsTAsgMT2k+/LNXKJRCoj4UV0LC78/CVHYNiug6UGvFTVa76a2v46nzwelw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1716025493; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=MolmMBZt1LO4RiCedTEusJA5MaqJfY9Y/sAo5N3HZuA=; b=JpDmxsTAKbAc13WAGBSRr45WmZVNel5k+na8V9Ecis6Po1oeg1xxKedr8GA4OjJ0slK0Uc H1w54zeemB5EICBg== From: "tip-bot2 for Uros Bizjak" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/percpu] x86/percpu: Introduce the __raw_cpu_read_const() macro Cc: Uros Bizjak , Ingo Molnar , Andy Lutomirski , Josh Poimboeuf , Linus Torvalds , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20240430091833.196482-4-ubizjak@gmail.com> References: <20240430091833.196482-4-ubizjak@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <171602549283.10875.15739867145799719700.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The following commit has been merged into the x86/percpu branch of tip: Commit-ID: 539615de7004a46778020183622856f4ca14e4ac Gitweb: https://git.kernel.org/tip/539615de7004a46778020183622856f4c= a14e4ac Author: Uros Bizjak AuthorDate: Tue, 30 Apr 2024 11:17:23 +02:00 Committer: Ingo Molnar CommitterDate: Sat, 18 May 2024 11:18:42 +02:00 x86/percpu: Introduce the __raw_cpu_read_const() macro Introduce the __raw_cpu_read_const() macro to further reduce ifdeffery and differences between configs w/ and w/o USE_X86_SEG_SUPPORT. No functional change intended. Signed-off-by: Uros Bizjak Signed-off-by: Ingo Molnar Cc: Andy Lutomirski Cc: Josh Poimboeuf Cc: Linus Torvalds Link: https://lore.kernel.org/r/20240430091833.196482-4-ubizjak@gmail.com --- arch/x86/include/asm/percpu.h | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h index f360ac5..d202551 100644 --- a/arch/x86/include/asm/percpu.h +++ b/arch/x86/include/asm/percpu.h @@ -156,6 +156,8 @@ do { \ *(qual __my_cpu_type(pcp) *)__my_cpu_ptr(&(pcp)) =3D (val); \ } while (0) =20 +#define __raw_cpu_read_const(pcp) __raw_cpu_read(, , pcp) + #else /* CONFIG_USE_X86_SEG_SUPPORT */ =20 #define __raw_cpu_read(size, qual, _var) \ @@ -180,6 +182,12 @@ do { \ : [val] __pcpu_reg_imm_##size(pto_val__)); \ } while (0) =20 +/* + * The generic per-cpu infrastrucutre is not suitable for + * reading const-qualified variables. + */ +#define __raw_cpu_read_const(pcp) ({ BUILD_BUG(); (typeof(pcp))0; }) + #endif /* CONFIG_USE_X86_SEG_SUPPORT */ =20 #define percpu_stable_op(size, op, _var) \ @@ -470,16 +478,7 @@ do { \ #define this_cpu_write_8(pcp, val) __raw_cpu_write(8, volatile, pcp, val) #endif =20 -#ifdef CONFIG_USE_X86_SEG_SUPPORT -#define this_cpu_read_const(pcp) __raw_cpu_read(, , pcp) -#else /* CONFIG_USE_X86_SEG_SUPPORT */ - -/* - * The generic per-cpu infrastrucutre is not suitable for - * reading const-qualified variables. - */ -#define this_cpu_read_const(pcp) ({ BUILD_BUG(); (typeof(pcp))0; }) -#endif /* CONFIG_USE_X86_SEG_SUPPORT */ +#define this_cpu_read_const(pcp) __raw_cpu_read_const(pcp) =20 #define this_cpu_read_stable_1(pcp) percpu_stable_op(1, "mov", pcp) #define this_cpu_read_stable_2(pcp) percpu_stable_op(2, "mov", pcp)