[PATCH] platform/x86/amd/hsmp: mark hsmp_msg_desc_table[] as maybe_unused

[Arnd Bergmann <arnd@kernel.org>]

From: Arnd Bergmann <arnd@arndb.de>

After the file got split, there are now W=1 warnings for users that
include it without referencing hsmp_msg_desc_table:

In file included from arch/x86/include/asm/amd_hsmp.h:6,
                 from drivers/platform/x86/amd/hsmp/plat.c:12:
arch/x86/include/uapi/asm/amd_hsmp.h:91:35: error: 'hsmp_msg_desc_table' defined but not used [-Werror=unused-const-variable=]
   91 | static const struct hsmp_msg_desc hsmp_msg_desc_table[] = {
      |                                   ^~~~~~~~~~~~~~~~~~~

Mark it as __attribute__((maybe_unused)) to shut up the warning but
keep it in the file in case it is used from userland. The __maybe_unused
shorthand unfurtunately isn't available in userspace, so this has to
be the long form.

Fixes: e47c018a0ee6 ("platform/x86/amd/hsmp: Move platform device specific code to plat.c")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
Ideally this array wouldn't be part of the UAPI at all, since it is
not really a interface, but it's hard to know what part  of the header
is actually used outside of the kernel.
---
 arch/x86/include/uapi/asm/amd_hsmp.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/uapi/asm/amd_hsmp.h b/arch/x86/include/uapi/asm/amd_hsmp.h
index e5d182c7373c..4a7cace06204 100644
--- a/arch/x86/include/uapi/asm/amd_hsmp.h
+++ b/arch/x86/include/uapi/asm/amd_hsmp.h
@@ -88,7 +88,8 @@ struct hsmp_msg_desc {
  *
  * Not supported messages would return -ENOMSG.
  */
-static const struct hsmp_msg_desc hsmp_msg_desc_table[] = {
+static const struct hsmp_msg_desc hsmp_msg_desc_table[]
+				__attribute__((unused)) = {
 	/* RESERVED */
 	{0, 0, HSMP_RSVD},
 
-- 
2.39.5