[PATCH] (4/4) stack updates for x86

Dave Hansen (haveblue@us.ibm.com)
Sun, 15 Dec 2002 21:59:19 -0800


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D-4k-stack-2.5.52+bk-6.patch
make a config option to turn on 4k stacks.

Make sure this is applied too, or you'll oops when bringing up
secondary cpus:
http://marc.theaimsgroup.com/?l=linux-kernel&m=103956921711074&w=2

-- 
Dave Hansen
haveblue@us.ibm.com

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# This is a BitKeeper generated patch for the following project: # Project Name: Linux kernel tree # This patch format is intended for GNU patch command version 2.5 or higher. # This patch includes the following deltas: # ChangeSet 1.862.1.4 -> 1.867 # include/asm-i386/thread_info.h 1.13.1.1 -> 1.17 # arch/i386/Kconfig 1.15 -> 1.16 # # The following is the BitKeeper ChangeSet Log # -------------------------------------------- # 02/12/15 haveblue@elm3b96.(none) 1.867 # Merge elm3b96.(none):/work/dave/bk/linux-2.5-irq-stack+overflow-detect # into elm3b96.(none):/work/dave/bk/linux-2.5-4k_stack # -------------------------------------------- # diff -Nru a/arch/i386/Kconfig b/arch/i386/Kconfig --- a/arch/i386/Kconfig Sun Dec 15 21:27:56 2002 +++ b/arch/i386/Kconfig Sun Dec 15 21:27:56 2002 @@ -622,6 +622,16 @@ low memory. Setting this option will put user-space page table entries in high memory. +config 4K_STACK + bool "Use smaller 4k per-task stacks" + help + This option will shrink the kernel's per-task stack from 8k to + 4k. This will greatly increase your chance of overflowing it. + But, if you use the per-cpu interrupt stacks as well, your chances + go way down. Also try the CONFIG_X86_STACK_CHECK overflow + detection. It is much more reliable than the currently in-kernel + version. + config MATH_EMULATION bool "Math emulation" ---help--- diff -Nru a/include/asm-i386/thread_info.h b/include/asm-i386/thread_info.h --- a/include/asm-i386/thread_info.h Sun Dec 15 21:27:56 2002 +++ b/include/asm-i386/thread_info.h Sun Dec 15 21:27:56 2002 @@ -61,10 +61,16 @@ * * preempt_count needs to be 1 initially, until the scheduler is functional. */ -#define THREAD_ORDER 1 +#ifdef CONFIG_4K_STACK +#define THREAD_ORDER 0 +#define STACK_WARN 0x200 +#define STACK_PANIC 0x100 +#else +#define THREAD_ORDER 1 +#define STACK_WARN ((THREAD_SIZE)>>1) +#define STACK_PANIC 0x100 +#endif #define INIT_THREAD_SIZE THREAD_SIZE -#define STACK_PANIC 0x200ul -#define STACK_WARN ((THREAD_SIZE)>>1) #ifndef __ASSEMBLY__

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