riscv: traps: add missing prototype

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: 31da94c ("riscv: add VMAP_STACK overflow detection") Signed-off-by: Conor Dooley <[email protected]> Cc: [email protected] Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Palmer Dabbelt <[email protected]>
ambv · Aug 18, 2022 · d951b20 · d951b20
1 parent b5c3aca
commit d951b20
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Showing 2 changed files with 4 additions and 1 deletion.
diff --git 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>
 

diff --git 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;