x86/amd_nb: Fix compile-testing without CONFIG_AMD_NB

[ Upstream commit fce9642c765a18abd1db0339a7d832c29b68456a ]

node_to_amd_nb() is defined to NULL in non-AMD configs:

  drivers/platform/x86/amd/hsmp/plat.c: In function 'init_platform_device':
  drivers/platform/x86/amd/hsmp/plat.c:165:68: error: dereferencing 'void *' pointer [-Werror]
    165 |                 sock->root                      = node_to_amd_nb(i)->root;
        |                                                                    ^~
  drivers/platform/x86/amd/hsmp/plat.c:165:68: error: request for member 'root' in something not a structure or union

Users of the interface who also allow COMPILE_TEST will cause the above build
error so provide an inline stub to fix that.

  [ bp: Massage commit message. ]

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20241029092329.3857004-1-arnd@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/x86/include/asm/amd_nb.h b/arch/x86/include/asm/amd_nb.h
index 455066a06f607eb5ba54f5fb68097f0ec289e7d5..d561f7866fa1696db1745f035ec7adfbf9746c97 100644 (file)
--- a/arch/x86/include/asm/amd_nb.h
+++ b/arch/x86/include/asm/amd_nb.h
@@ -118,7 +118,10 @@ static inline bool amd_gart_present(void)
 
 #define amd_nb_num(x)          0
 #define amd_nb_has_feature(x)  false
-#define node_to_amd_nb(x)      NULL
+static inline struct amd_northbridge *node_to_amd_nb(int node)
+{
+       return NULL;
+}
 #define amd_gart_present(x)    false
 
 #endif