powerpc/powernv: Fix type of opal_mpipl_query_tag() addr argument

opal_mpipl_query_tag() takes a pointer to a 64-bit value, which firmware
writes a value to. As OPAL is traditionally big endian this value will
be big endian.

This can be confirmed by looking at the implementation in skiboot:

  static uint64_t opal_mpipl_query_tag(enum opal_mpipl_tags tag, __be64 *tag_val)
  {
  	...
  	*tag_val = cpu_to_be64(opal_mpipl_tags[tag]);
  	return OPAL_SUCCESS;
  }

Fix the declaration to annotate that the value is big endian.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210421125402.1955013-2-mpe@ellerman.id.au

diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 9986ac3..c761572 100644 (file)
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -307,7 +307,7 @@ int opal_secvar_enqueue_update(const char *key, uint64_t key_len, u8 *data,
 
 s64 opal_mpipl_update(enum opal_mpipl_ops op, u64 src, u64 dest, u64 size);
 s64 opal_mpipl_register_tag(enum opal_mpipl_tags tag, u64 addr);
-s64 opal_mpipl_query_tag(enum opal_mpipl_tags tag, u64 *addr);
+s64 opal_mpipl_query_tag(enum opal_mpipl_tags tag, __be64 *addr);
 
 s64 opal_signal_system_reset(s32 cpu);
 s64 opal_quiesce(u64 shutdown_type, s32 cpu);