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 <[email protected]> (failed allmodconfig build) Signed-off-by: Tony Luck <[email protected]>
kawasaki · Jul 19, 2012 · e9c31b3 · e9c31b3
1 parent f28fa72
commit e9c31b3
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
@@ -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.