From nobody Sun Feb 8 08:42:50 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 6E2ACEB64DA for ; Wed, 14 Jun 2023 01:31:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241414AbjFNBbF (ORCPT ); Tue, 13 Jun 2023 21:31:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43638 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242115AbjFNBas (ORCPT ); Tue, 13 Jun 2023 21:30:48 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C34C71FCE; Tue, 13 Jun 2023 18:30:36 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id B4E7962F37; Wed, 14 Jun 2023 01:30:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3C855C433CC; Wed, 14 Jun 2023 01:30:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1686706234; bh=qsjRxtxZYf2OUYpf9/BMTkMpzMYIpbCMO3E2fwLXlKI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UZXQlRD/QfHOQjSClgU9X1RRPI3A8OzbdviJ5/Z+3PONCuyh0R2LRMdCgOZzjO8vD OxzFI4PFDIfGvxIKSWQ8/3JIKD08Lr7S5FEaFWAuxre5I+cBxKhjslIAXNu/A0AzuO urgNX6dHtj89ouVC5T+hSvjw7+H34cHza8T2mTQmrP/CzXRRJtOZ6v2mKRnowwhuXT 3zAClr6i/4hOWpF4nBht7oJpHrY57kHYDXRQWl93ZEiztO8TXgLiRUDmq5jeHCa6Nb t9W8rn6fa1SsAZBAjzEemGqUsx5wfbu1cPWUGpBT5das0EdtK28eQK2jKOHpLjaSj9 gHSMHt+kB75FQ== From: guoren@kernel.org To: arnd@arndb.de, guoren@kernel.org, palmer@rivosinc.com, conor.dooley@microchip.com, heiko@sntech.de, jszhang@kernel.org, bjorn@kernel.org, cleger@rivosinc.com Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Guo Ren Subject: [PATCH -next V13 3/3] riscv: stack: Add config of thread stack size Date: Tue, 13 Jun 2023 21:30:18 -0400 Message-Id: <20230614013018.2168426-4-guoren@kernel.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20230614013018.2168426-1-guoren@kernel.org> References: <20230614013018.2168426-1-guoren@kernel.org> 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" From: Guo Ren The commit 0cac21b02ba5 ("riscv: use 16KB kernel stack on 64-bit") increases the thread size mandatory, but some scenarios, such as D1 with a small memory footprint, would suffer from that. After independent irq stack support, let's give users a choice to determine their custom stack size. Link: https://lore.kernel.org/linux-riscv/5f6e6c39-b846-4392-b468-02202404d= e28@www.fastmail.com/ Suggested-by: Arnd Bergmann Tested-by: Jisheng Zhang Signed-off-by: Guo Ren Signed-off-by: Guo Ren --- arch/riscv/Kconfig | 10 ++++++++++ arch/riscv/include/asm/thread_info.h | 12 +----------- 2 files changed, 11 insertions(+), 11 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index f515cb101c19..0599bba13654 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -599,6 +599,16 @@ config IRQ_STACKS Add independent irq & softirq stacks for percpu to prevent kernel stack overflows. We may save some memory footprint by disabling IRQ_STACKS. =20 +config THREAD_SIZE_ORDER + int "Kernel stack size (in power-of-two numbers of page size)" if VMAP_ST= ACK && EXPERT + range 0 4 + default 1 if 32BIT && !KASAN + default 3 if 64BIT && KASAN + default 2 + help + Specify the Pages of thread stack size (from 4KB to 64KB), which also + affects irq stack size, which is equal to thread stack size. + endmenu # "Platform type" =20 menu "Kernel features" diff --git a/arch/riscv/include/asm/thread_info.h b/arch/riscv/include/asm/= thread_info.h index 2f32875276b0..1833beb00489 100644 --- a/arch/riscv/include/asm/thread_info.h +++ b/arch/riscv/include/asm/thread_info.h @@ -11,18 +11,8 @@ #include #include =20 -#ifdef CONFIG_KASAN -#define KASAN_STACK_ORDER 1 -#else -#define KASAN_STACK_ORDER 0 -#endif - /* thread information allocation */ -#ifdef CONFIG_64BIT -#define THREAD_SIZE_ORDER (2 + KASAN_STACK_ORDER) -#else -#define THREAD_SIZE_ORDER (1 + KASAN_STACK_ORDER) -#endif +#define THREAD_SIZE_ORDER CONFIG_THREAD_SIZE_ORDER #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) =20 /* --=20 2.36.1