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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
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 V5 10/11] riscv: Add config of thread stack size
Date: Sun, 18 Sep 2022 11:52:45 -0400	[thread overview]
Message-ID: <20220918155246.1203293-11-guoren@kernel.org> (raw)
In-Reply-To: <20220918155246.1203293-1-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                   | 18 ++++++++++++++++++
 arch/riscv/include/asm/thread_info.h | 12 +-----------
 2 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index dfe600f3526c..8241b12399d7 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -442,6 +442,24 @@ 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
+	int "Kernel stack size (in bytes)" if EXPERT
+	range 4096 65536
+	default 8192 if 32BIT && !KASAN
+	default 32768 if 64BIT && KASAN
+	default 16384
+	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.
+
+config THREAD_SIZE_ORDER
+	int
+	default 0 if THREAD_SIZE = 4096
+	default 1 if THREAD_SIZE <= 8192
+	default 2 if THREAD_SIZE <= 16384
+	default 3 if THREAD_SIZE <= 32768
+	default 4
+
 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


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

WARNING: multiple messages have this Message-ID (diff)
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
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 V5 10/11] riscv: Add config of thread stack size
Date: Sun, 18 Sep 2022 11:52:45 -0400	[thread overview]
Message-ID: <20220918155246.1203293-11-guoren@kernel.org> (raw)
In-Reply-To: <20220918155246.1203293-1-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                   | 18 ++++++++++++++++++
 arch/riscv/include/asm/thread_info.h | 12 +-----------
 2 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index dfe600f3526c..8241b12399d7 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -442,6 +442,24 @@ 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
+	int "Kernel stack size (in bytes)" if EXPERT
+	range 4096 65536
+	default 8192 if 32BIT && !KASAN
+	default 32768 if 64BIT && KASAN
+	default 16384
+	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.
+
+config THREAD_SIZE_ORDER
+	int
+	default 0 if THREAD_SIZE = 4096
+	default 1 if THREAD_SIZE <= 8192
+	default 2 if THREAD_SIZE <= 16384
+	default 3 if THREAD_SIZE <= 32768
+	default 4
+
 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


  parent reply	other threads:[~2022-09-18 15:54 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-18 15:52 [PATCH V5 00/11] riscv: Add GENERIC_ENTRY support and related features guoren
2022-09-18 15:52 ` guoren
2022-09-18 15:52 ` [PATCH V5 01/11] riscv: elf_kexec: Fixup compile warning guoren
2022-09-18 15:52   ` guoren
2022-09-18 15:52 ` [PATCH V5 02/11] riscv: compat_syscall_table: " guoren
2022-09-18 15:52   ` guoren
2022-09-18 15:52 ` [PATCH V5 03/11] riscv: ptrace: Remove duplicate operation guoren
2022-09-18 15:52   ` guoren
2022-09-18 15:52 ` [PATCH V5 04/11] compiler_types.h: Add __noinstr_section() for noinstr guoren
2022-09-18 15:52   ` guoren
2022-09-18 15:52 ` [PATCH V5 05/11] riscv: traps: Add noinstr to prevent instrumentation inserted guoren
2022-09-18 15:52   ` guoren
2022-09-18 15:52 ` [PATCH V5 06/11] entry: Prevent DEBUG_PREEMPT warning guoren
2022-09-18 15:52   ` guoren
2022-09-19 11:58   ` Peter Zijlstra
2022-09-19 11:58     ` Peter Zijlstra
2022-09-20  1:45     ` Guo Ren
2022-09-20  1:45       ` Guo Ren
2022-09-30 12:27       ` Guo Ren
2022-09-30 12:27         ` Guo Ren
2022-09-18 15:52 ` [PATCH V5 07/11] riscv: convert to generic entry guoren
2022-09-18 15:52   ` guoren
2022-09-19 13:34   ` Peter Zijlstra
2022-09-19 13:34     ` Peter Zijlstra
2022-09-20  6:36     ` Guo Ren
2022-09-20  6:36       ` Guo Ren
2022-09-20  7:22       ` Peter Zijlstra
2022-09-20  7:22         ` Peter Zijlstra
2022-09-30 11:28         ` Guo Ren
2022-09-30 11:28           ` Guo Ren
2022-09-18 15:52 ` [PATCH V5 08/11] riscv: Support HAVE_IRQ_EXIT_ON_IRQ_STACK guoren
2022-09-18 15:52   ` guoren
2022-09-19 13:45   ` Peter Zijlstra
2022-09-19 13:45     ` Peter Zijlstra
2022-09-20  6:08     ` Guo Ren
2022-09-20  6:08       ` Guo Ren
2022-09-20  7:27       ` Peter Zijlstra
2022-09-20  7:27         ` Peter Zijlstra
2022-09-20  7:34         ` Peter Zijlstra
2022-09-20  7:34           ` Peter Zijlstra
2022-09-21  6:16           ` Guo Ren
2022-09-21  6:16             ` Guo Ren
2022-09-21  8:34   ` Chen Zhongjin
2022-09-21  8:34     ` Chen Zhongjin
2022-09-21  9:53     ` Guo Ren
2022-09-21  9:53       ` Guo Ren
2022-09-21 11:56       ` Chen Zhongjin
2022-09-21 11:56         ` Chen Zhongjin
2022-09-22  1:26         ` Guo Ren
2022-09-22  1:26           ` Guo Ren
2022-09-18 15:52 ` [PATCH V5 09/11] riscv: Support HAVE_SOFTIRQ_ON_OWN_STACK guoren
2022-09-18 15:52   ` guoren
2022-09-20  0:11   ` Guo Ren
2022-09-20  0:11     ` Guo Ren
2022-09-18 15:52 ` guoren [this message]
2022-09-18 15:52   ` [PATCH V5 10/11] riscv: Add config of thread stack size guoren
2022-09-18 15:52 ` [PATCH V5 11/11] riscv: Add support for STACKLEAK gcc plugin guoren
2022-09-18 15:52   ` guoren

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