From: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Fixes: 7e1864332fbc ("riscv: fix race when vmap stack overflow")
Reviewed-by: Guo Ren <guoren@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230210185945.915806-1-conor@xxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/riscv/include/asm/thread_info.h | 1 +
1 file changed, 1 insertion(+)
--- 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>
