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, greentime.hu@sifive.com,
vincent.chen@sifive.com, andy.chiu@sifive.com,
paul.walmsley@sifive.com
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-riscv@lists.infradead.org,
Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH -next V12 3/3] riscv: stack: Add config of thread stack size
Date: Mon, 29 May 2023 04:46:00 -0400 [thread overview]
Message-ID: <20230529084600.2878130-4-guoren@kernel.org> (raw)
In-Reply-To: <20230529084600.2878130-1-guoren@kernel.org>
From: Guo Ren <guoren@linux.alibaba.com>
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-b468-02202404de28@www.fastmail.com/
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
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 9567bf5fd5ed..e82be82882fd 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -597,6 +597,16 @@ 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.
+config THREAD_SIZE_ORDER
+ int "Kernel stack size (in power-of-two numbers of page size)" if VMAP_STACK && 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"
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 <asm/page.h>
#include <linux/const.h>
-#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)
/*
--
2.36.1
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prev parent reply other threads:[~2023-05-29 8:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-29 8:45 [PATCH -next V12 0/3] riscv: Add independent irq/softirq stacks guoren
2023-05-29 8:45 ` [PATCH -next V12 1/3] riscv: stack: Support HAVE_IRQ_EXIT_ON_IRQ_STACK guoren
2023-06-13 13:01 ` Clément Léger
2023-06-13 15:21 ` Guo Ren
2023-05-29 8:45 ` [PATCH -next V12 2/3] riscv: stack: Support HAVE_SOFTIRQ_ON_OWN_STACK guoren
2023-05-29 8:46 ` guoren [this message]
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