* Tony Luck <tony.l...@intel.com> wrote:
> 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...@intel.com> (failed allmodconfig build)
> Signed-off-by: Tony Luck <tony.l...@intel.com>
> ---
> lib/Kconfig.debug | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index ff5bdee..4a18650 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -714,7 +714,7 @@ config STACKTRACE
>
> config DEBUG_STACK_USAGE
> bool "Stack utilization instrumentation"
> - depends on DEBUG_KERNEL
> + depends on DEBUG_KERNEL && !IA64 && !PARISC
The modern way of doing this is by adding an ARCH_SUPPORTS_
flag.
Thanks,
Ingo
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