[PATCH] powerpc/32: Include thread_info.h in head_booke.h

[Nathan Chancellor <nathan@kernel.org>]

When building with W=1 after commit 80b6093b55e3 ("kbuild: add -Wundef
to KBUILD_CPPFLAGS for W=1 builds"), the following warning occurs.

  In file included from arch/powerpc/kvm/bookehv_interrupts.S:26:
  arch/powerpc/kvm/../kernel/head_booke.h:20:6: warning: "THREAD_SHIFT" is not defined, evaluates to 0 [-Wundef]
     20 | #if (THREAD_SHIFT < 15)
        |      ^~~~~~~~~~~~

THREAD_SHIFT is defined in thread_info.h but it is not directly included
in head_booke.h, so it is possible for THREAD_SHIFT to be undefined. Add
the include to ensure that THREAD_SHIFT is always defined.

Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/202304050954.yskLdczH-lkp@intel.com/
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
 arch/powerpc/kernel/head_booke.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 37d43c172676..b6b5b01a173c 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -5,6 +5,7 @@
 #include <asm/ptrace.h>	/* for STACK_FRAME_REGS_MARKER */
 #include <asm/kvm_asm.h>
 #include <asm/kvm_booke_hv_asm.h>
+#include <asm/thread_info.h>	/* for THREAD_SHIFT */
 
 #ifdef __ASSEMBLY__
 

---
base-commit: b0bbe5a2915201e3231e788d716d39dc54493b03
change-id: 20230406-wundef-thread_shift_booke-e08d806ed656

Best regards,
-- 
Nathan Chancellor <nathan@kernel.org>