powerpc: Unconditionally enabled irq stacks

Irq stacks provide an essential protection from stack overflows through
external interrupts, at the cost of two additionals stacks per CPU.

Enable them unconditionally to simplify the kernel build and prevent
people from accidentally disabling them.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 0 insertions, 7 deletions

diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index 53696da4518f..2d38a50e66ba 100644
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -135,13 +135,6 @@ config DEBUGGER
         depends on KGDB || XMON
         default y
 
-config IRQSTACKS
-        bool "Use separate kernel stacks when processing interrupts"
-        help
-          If you say Y here the kernel will use separate kernel stacks
-          for handling hard and soft interrupts.  This can help avoid
-          overflowing the process kernel stacks.
-
 config VIRQ_DEBUG
         bool "Expose hardware/virtual IRQ mapping via debugfs"
         depends on DEBUG_FS