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| author | Helge Deller <deller@gmx.de> | 2013-05-07 19:28:52 +0000 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2013-05-07 21:34:07 +0200 |
| commit | 9372450cc22d185f708e5cc3557cf991be4b7dc5 (patch) | |
| tree | f537999c1134549b14fce04a020e6e4d23d03d4c /arch/parisc/Kconfig.debug | |
| parent | c207a76bf155cb5cf24cf849c08f6555e9180594 (diff) | |
| download | linux-0-day-9372450cc22d185f708e5cc3557cf991be4b7dc5.tar.gz linux-0-day-9372450cc22d185f708e5cc3557cf991be4b7dc5.tar.xz | |
parisc: add kernel stack overflow check
Add the CONFIG_DEBUG_STACKOVERFLOW config option to enable checks to
detect kernel stack overflows.
Stack overflows can not be detected reliable since we do not want to
introduce too much overhead.
Instead, during irq processing in do_cpu_irq_mask() we check kernel
stack usage of the interrupted kernel process. Kernel threads can be
easily detected by checking the value of space register 7 (sr7) which
is zero when running inside the kernel.
Since THREAD_SIZE is 16k and PAGE_SIZE is 4k, reduce the alignment of
the init thread to the lower value (PAGE_SIZE) in the kernel
vmlinux.ld.S linker script.
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/Kconfig.debug')
| -rw-r--r-- | arch/parisc/Kconfig.debug | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/parisc/Kconfig.debug b/arch/parisc/Kconfig.debug index bc989e522a045..08a332f6ee874 100644 --- a/arch/parisc/Kconfig.debug +++ b/arch/parisc/Kconfig.debug @@ -13,3 +13,14 @@ config DEBUG_RODATA If in doubt, say "N". endmenu + +config DEBUG_STACKOVERFLOW + bool "Check for stack overflows" + default y + depends on DEBUG_KERNEL + ---help--- + 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". |