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x86: Check stack overflow in detail

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Currently, only kernel stack is checked for the overflow, which
is not sufficient for systems that need a high reliability. To
enhance it, it is required to check the IRQ and exception
stacks, as well.

This patch checks all the stack types and will cause messages of
stacks in detail when free stack space drops below a certain
limit except user stack.

Signed-off-by: Mitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com>
Cc: yrl.pp-manager.tt@hitachi.com
Cc: Randy Dunlap <rdunlap@xenotime.net>
Link: http://lkml.kernel.org/r/20111129060829.11076.51733.stgit@ltc219.sdl.hitachi.co.jp
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
This commit is contained in:
Mitsuo Hayasaka
2011-11-29 15:08:29 +09:00
committed by Ingo Molnar
parent 69682b625a
commit 37fe6a42b3
2 changed files with 28 additions and 8 deletions
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arch/x86/Kconfig.debug
+5 -2
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@@ -63,8 +63,11 @@ config DEBUG_STACKOVERFLOW
bool "Check for stack overflows"
depends on DEBUG_KERNEL
---help---
This option will cause messages to be printed if free stack space
drops below a certain limit.
Say Y here if you want to check the overflows of kernel, IRQ
and exception stacks. This option will cause messages of the
stacks in detail when free stack space drops below a certain
limit.
If in doubt, say "N".
config X86_PTDUMP
bool "Export kernel pagetable layout to userspace via debugfs"