commit eb9be831 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 <[email protected]>
Fixes: 7e186433 ("riscv: fix race when vmap stack overflow")
Reviewed-by: Guo Ren <[email protected]>
Link: https://lore.kernel.org/r/[email protected]


Cc: [email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>