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
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-riscv@lists.infradead.org,
Guo Ren <guoren@linux.alibaba.com>,
Andreas Schwab <schwab@suse.de>
Subject: [PATCH V6 10/11] riscv: Add config of thread stack size
Date: Sat, 1 Oct 2022 21:24:50 -0400 [thread overview]
Message-ID: <20221002012451.2351127-11-guoren@kernel.org> (raw)
In-Reply-To: <20221002012451.2351127-1-guoren@kernel.org>
From: Guo Ren <guoren@linux.alibaba.com>
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 <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Cc: Andreas Schwab <schwab@suse.de>
---
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 76bde12d9f8c..602e577c429c 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -443,6 +443,16 @@ 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 043da8ccc7e6..c970d41dc4c6 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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next prev parent reply other threads:[~2022-10-02 1:26 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-02 1:24 [PATCH V6 00/11] riscv: Add GENERIC_ENTRY support and related features guoren
2022-10-02 1:24 ` [PATCH V6 01/11] riscv: elf_kexec: Fixup compile warning guoren
2022-10-25 1:20 ` liaochang (A)
2022-10-25 2:36 ` Guo Ren
2022-10-02 1:24 ` [PATCH V6 02/11] riscv: compat_syscall_table: " guoren
2022-10-02 1:24 ` [PATCH V6 03/11] riscv: ptrace: Remove duplicate operation guoren
2022-10-02 1:24 ` [PATCH V6 04/11] compiler_types.h: Add __noinstr_section() for noinstr guoren
2022-10-03 11:38 ` Mark Rutland
2022-10-08 1:54 ` Guo Ren
2022-10-20 9:15 ` Mark Rutland
2022-10-20 12:29 ` Guo Ren
2022-10-24 11:56 ` Mark Rutland
2022-10-24 12:06 ` Peter Zijlstra
2022-10-24 12:14 ` Mark Rutland
2022-10-25 2:51 ` Guo Ren
2022-10-25 9:47 ` Mark Rutland
2022-10-02 1:24 ` [PATCH V6 05/11] riscv: traps: Add noinstr to prevent instrumentation inserted guoren
2022-10-03 11:40 ` Mark Rutland
2022-10-08 2:16 ` Guo Ren
2022-10-02 1:24 ` [PATCH V6 06/11] riscv: convert to generic entry guoren
2022-10-02 1:24 ` [PATCH V6 07/11] riscv: Support HAVE_IRQ_EXIT_ON_IRQ_STACK guoren
2022-10-02 1:24 ` [PATCH V6 08/11] riscv: Support HAVE_SOFTIRQ_ON_OWN_STACK guoren
2022-10-02 1:24 ` [PATCH V6 09/11] riscv: Add support for STACKLEAK gcc plugin guoren
2022-10-03 11:34 ` Mark Rutland
2022-10-08 0:16 ` Guo Ren
2022-10-08 3:26 ` Guo Ren
2022-10-08 3:44 ` Guo Ren
2022-10-02 1:24 ` guoren [this message]
2022-10-02 1:24 ` [PATCH V6 11/11] riscv: remove extra level wrappers of trace_hardirqs_{on,off} guoren
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