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debug: Do not permit CONFIG_DEBUG_STACK_USAGE=y on IA64 or PARISC 

The stack_not_used() function in <linux/sched.h> assumes that stacks
grow downwards. This is not true on IA64 or PARISC, so this function
would walk off in the wrong direction and into the weeds.

Found on IA64 because of a compilation failure with recursive dependencies
on IA64_TASKSIZE and IA64_THREAD_INFO_SIZE.

Fixing the code is possible, but should be combined with other
infrastructure additions to set up the "canary" at the end of the stack.

Reported-by: Fengguang Wu <fengguang.wu@intel.com> (failed allmodconfig build)
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Tony Luck 2012-07-18 10:35:05 -07:00
parent f28fa72914
commit e9c31b32f1
1 changed files with 1 additions and 1 deletions
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lib/Kconfig.debug
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@ -694,7 +694,7 @@ config STACKTRACE
config DEBUG_STACK_USAGE
bool "Stack utilization instrumentation"
depends on DEBUG_KERNEL
depends on DEBUG_KERNEL && !IA64 && !PARISC
help
Enables the display of the minimum amount of free stack which each
task has ever had available in the sysrq-T and sysrq-P debug output.