linux-kernel - [PATCH AUTOSEL 4.19 4/5] x86/amd_nb: Fix compile-testing without CONFIG_AMD

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Message-ID: <20241104105539.98219-4-sashal@kernel.org>
Date: Mon,  4 Nov 2024 05:55:33 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>,
	Borislav Petkov <bp@...en8.de>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Sasha Levin <sashal@...nel.org>,
	tglx@...utronix.de,
	mingo@...hat.com,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	yazen.ghannam@....com,
	rdunlap@...radead.org,
	bhelgaas@...gle.com
Subject: [PATCH AUTOSEL 4.19 4/5] x86/amd_nb: Fix compile-testing without CONFIG_AMD_NB

From: Arnd Bergmann <arnd@...db.de>

[ 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@...db.de>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Link: https://lore.kernel.org/r/20241029092329.3857004-1-arnd@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/include/asm/amd_nb.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/amd_nb.h b/arch/x86/include/asm/amd_nb.h
index fddb6d26239f5..7957ac2a643fd 100644
--- a/arch/x86/include/asm/amd_nb.h
+++ b/arch/x86/include/asm/amd_nb.h
@@ -115,7 +115,10 @@ 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
-- 
2.43.0