[PATCH 5.19 130/158] riscv: traps: add missing prototype

Greg Kroah-Hartman
2022-08-29T11:32:36Z

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

commit d951b20b9def73dcc39a5379831525d0d2a537e9 upstream.

Sparse complains:
arch/riscv/kernel/traps.c:213:6: warning: symbol 'shadow_stack' was not declared. Should it be static?

The variable is used in entry.S, so declare shadow_stack there
alongside SHADOW_OVERFLOW_STACK_SIZE.

Fixes: 31da94c25aea ("riscv: add VMAP_STACK overflow detection")
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20220814141237.493457-5-mail@conchuod.ie
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/riscv/include/asm/thread_info.h | 2 ++
arch/riscv/kernel/traps.c | 3 ++-
2 files changed, 4 insertions(+), 1 deletion(-)

--- a/arch/riscv/include/asm/thread_info.h
+++ b/arch/riscv/include/asm/thread_info.h
@@ -42,6 +42,8 @@

#ifndef __ASSEMBLY__

+extern long shadow_stack[SHADOW_OVERFLOW_STACK_SIZE / sizeof(long)];
+
#include <asm/processor.h>
#include <asm/csr.h>

--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -20,9 +20,10 @@

#include <asm/asm-prototypes.h>
#include <asm/bug.h>
+#include <asm/csr.h>
#include <asm/processor.h>
#include <asm/ptrace.h>
-#include <asm/csr.h>
+#include <asm/thread_info.h>

int show_unhandled_signals = 1;