linux-kernel - [PATCH] tpm: aovid -Wunused-but-set-variable

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Date: Fri, 22 Mar 2024 14:22:48 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Jarkko Sakkinen <jarkko@...nel.org>,
	Matthew Garrett <mjg59@...gle.com>,
	Bartosz Szczepanek <bsz@...ihalf.com>,
	Ard Biesheuvel <ardb@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] tpm: aovid -Wunused-but-set-variable

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

Outside of the EFI tpm code, the TPM_MEMREMAP()/TPM_MEMUNMAP functions are
defined as trivial macros, leading to the mapping_size variable ending
up unused:

In file included from drivers/char/tpm/tpm-sysfs.c:16:
In file included from drivers/char/tpm/tpm.h:28:
include/linux/tpm_eventlog.h:167:6: error: variable 'mapping_size' set but not used [-Werror,-Wunused-but-set-variable]
  167 |         int mapping_size;

Turn the stubs into inline functions to avoid this warning.

Fixes: c46f3405692d ("tpm: Reserve the TPM final events table")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 include/linux/tpm_eventlog.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/tpm_eventlog.h b/include/linux/tpm_eventlog.h
index 7d68a5cc5881..6e5be15029fb 100644
--- a/include/linux/tpm_eventlog.h
+++ b/include/linux/tpm_eventlog.h
@@ -131,11 +131,16 @@ struct tcg_algorithm_info {
 };
 
 #ifndef TPM_MEMREMAP
-#define TPM_MEMREMAP(start, size) NULL
+static inline void *TPM_MEMREMAP(unsigned long start, size_t size)
+{
+	return NULL;
+}
 #endif
 
 #ifndef TPM_MEMUNMAP
-#define TPM_MEMUNMAP(start, size) do{} while(0)
+static inline void TPM_MEMUNMAP(void *mapping, size_t size)
+{
+}
 #endif
 
 /**
-- 
2.39.2