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riscv: stack: Add config of thread stack size

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The commit 0cac21b02b ("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>
Link: https://lore.kernel.org/r/20230614013018.2168426-4-guoren@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Guo Ren 2023-06-13 21:30:18 -04:00 committed by Palmer Dabbelt
parent dd69d07a5a
commit a7555f6b62
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GPG key ID: 2E1319F35FBB1889
2 changed files with 11 additions and 11 deletions
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10
arch/riscv/Kconfig
View file

@ -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.
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"

12
arch/riscv/include/asm/thread_info.h
View file

@ -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)
/*