[PATCH v1] RISC-V: add a spin_shadow_stack declaration

[Conor Dooley]

From: Conor Dooley <conor.dooley at microchip.com>

The patchwork automation reported a sparse complaint that
spin_shadow_stack was not declared and should be static:
../arch/riscv/kernel/traps.c:335:15: warning: symbol 'spin_shadow_stack' was not declared. Should it be static?

However, this is used in entry.S and therefore shouldn't be static.
The same applies to the shadow_stack that this pseudo spinlock is
trying to protect, so do like its charge and add a declaration to
thread_info.h

Signed-off-by: Conor Dooley <conor.dooley at microchip.com>
---
Applies on top of Guo Ren's generic entry series.
---
 arch/riscv/include/asm/thread_info.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/include/asm/thread_info.h b/arch/riscv/include/asm/thread_info.h
index 7de4fb96f0b5..e0d202134b44 100644
--- a/arch/riscv/include/asm/thread_info.h
+++ b/arch/riscv/include/asm/thread_info.h
@@ -43,6 +43,7 @@
 #ifndef __ASSEMBLY__
 
 extern long shadow_stack[SHADOW_OVERFLOW_STACK_SIZE / sizeof(long)];
+extern unsigned long spin_shadow_stack;
 
 #include <asm/processor.h>
 #include <asm/csr.h>
-- 
2.39.1