[PATCH 5.4 185/215] riscv: use 16KB kernel stack on 64-bit

[Greg Kroah-Hartman]

From: Andreas Schwab <schwab@xxxxxxx>

commit 0cac21b02ba5f3095fd2dcc77c26a25a0b2432ed upstream.

With the current 8KB stack size there are frequent overflows in a 64-bit
configuration.  We may split IRQ stacks off in the future, but this fixes a
number of issues right now.

Signed-off-by: Andreas Schwab <schwab@xxxxxxx>
Reviewed-by: Anup Patel <anup@xxxxxxxxxxxxxx>
[Palmer: mention irqstack in the commit text]
Fixes: 7db91e57a0ac ("RISC-V: Task implementation")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Palmer Dabbelt <palmerdabbelt@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/riscv/include/asm/thread_info.h |    4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/riscv/include/asm/thread_info.h
+++ b/arch/riscv/include/asm/thread_info.h
@@ -12,7 +12,11 @@
 #include <linux/const.h>
 
 /* thread information allocation */
+#ifdef CONFIG_64BIT
+#define THREAD_SIZE_ORDER	(2)
+#else
 #define THREAD_SIZE_ORDER	(1)
+#endif
 #define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)
 
 #ifndef __ASSEMBLY__