From nobody Thu Apr 9 07:50:23 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 3CE5AC433FE for ; Thu, 3 Nov 2022 07:53:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231429AbiKCHxt (ORCPT ); Thu, 3 Nov 2022 03:53:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45072 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231520AbiKCHwo (ORCPT ); Thu, 3 Nov 2022 03:52:44 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 270FE6470; Thu, 3 Nov 2022 00:52:38 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id CDC71B8269A; Thu, 3 Nov 2022 07:52:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C9000C43140; Thu, 3 Nov 2022 07:52:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1667461955; bh=uPAVEzUw+uho6yxJPCynQKkznTRi0Kzk4knleNhHaqE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kfep/7KcLwnO79w/PeNqtmpbDYeOkMa8tvNBMtwafxei93IHGlEfdk7CuBGxFJnVB omSUGJJtq11u+7Qjve2hmZ6GGzvDdHtpE0C3GIJJkbFXBUGPaNM5E/hqo8BkMcvIUs odgmznutBSogV844o2Fr109c+Mcp2AW72YqQAbI8UeBo+IaVvNvYpfiFCH+NqB/AZR /GGQ2DH6s8ED1gNkKYu9uD0RjHnn2j/wRq+NSFLVweuUdvhoZMtQWgWIZX9HqK13Be N1VOg/RN+EkgZZR5/X0e3JSu+txjr15soTUS/44N1FmamVXPwXUI48Dx8orKOf0sU2 EHgviEqRzDHfg== From: guoren@kernel.org To: arnd@arndb.de, guoren@kernel.org, palmer@rivosinc.com, tglx@linutronix.de, peterz@infradead.org, luto@kernel.org, conor.dooley@microchip.com, heiko@sntech.de, jszhang@kernel.org, lazyparser@gmail.com, falcon@tinylab.org, chenhuacai@kernel.org, apatel@ventanamicro.com, atishp@atishpatra.org, palmer@dabbelt.com, paul.walmsley@sifive.com, mark.rutland@arm.com, zouyipeng@huawei.com, bigeasy@linutronix.de, David.Laight@aculab.com, chenzhongjin@huawei.com, greentime.hu@sifive.com, andy.chiu@sifive.com Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Guo Ren , Andreas Schwab Subject: [PATCH -next V8 09/14] riscv: Add config of thread stack size Date: Thu, 3 Nov 2022 03:50:42 -0400 Message-Id: <20221103075047.1634923-10-guoren@kernel.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20221103075047.1634923-1-guoren@kernel.org> References: <20221103075047.1634923-1-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 0cac21b02ba5 ("risc v: use 16KB kernel stack on 64-bit") increase 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. Signed-off-by: Guo Ren Signed-off-by: Guo Ren Cc: Andreas Schwab --- 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 85241415a935..df067b225757 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -454,6 +454,16 @@ 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 043da8ccc7e6..c970d41dc4c6 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