From: Conor Dooley <conor.dooley@microchip.com>
Date: Fri, 10 Feb 2023 18:59:45 +0000
Subject: [PATCH] RISC-V: add a spin_shadow_stack declaration
References: bsc#1012628
Patch-mainline: 6.2.3
Git-commit: eb9be8310c58c166f9fae3b71c0ad9d6741b4897

commit eb9be8310c58c166f9fae3b71c0ad9d6741b4897 upstream.

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@microchip.com>
Fixes: 7e1864332fbc ("riscv: fix race when vmap stack overflow")
Reviewed-by: Guo Ren <guoren@kernel.org>
Link: https://lore.kernel.org/r/20230210185945.915806-1-conor@kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 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 67322f87..f704c8dd 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>
-- 
2.35.3