[PATCH] tpm: eventlog: Declare mapping_size __maybe_unused
From: WangYuli
Date: Tue Mar 11 2025 - 08:05:30 EST
Given that when CONFIG_EFI is not enabled, do_mapping is inherently
false. Thus, the mapping_size variable is set but remains unused,
resulting in a compilation warning.
Simply annotating it with __maybe_unused will resolve this compilation
warning.
[ Fix follow errors with clang-19 when W=1e: ]
In file included from drivers/char/tpm/tpm1-cmd.c:21:
./include/linux/tpm_eventlog.h:167:6: error: variable 'mapping_size' set but not used [-Werror,-Wunused-but-set-variable]
167 | int mapping_size;
| ^
1 error generated.
make[8]: *** [scripts/Makefile.build:207: drivers/char/tpm/tpm1-cmd.o] Error 1
make[8]: *** Waiting for unfinished jobs....
In file included from drivers/char/tpm/tpm-dev-common.c:19:
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;
| ^
1 error generated.
make[8]: *** [scripts/Makefile.build:207: drivers/char/tpm/tpm-dev-common.o] Error 1
In file included from drivers/char/tpm/tpm2-cmd.c:14:
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;
| ^
1 error generated.
In file included from drivers/char/tpm/tpm-dev.c:16:
In file included from drivers/char/tpm/tpm-dev.h:6:
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;
| ^
1 error generated.
make[8]: *** [scripts/Makefile.build:207: drivers/char/tpm/tpm-dev.o] Error 1
make[8]: *** [scripts/Makefile.build:207: drivers/char/tpm/tpm2-cmd.o] Error 1
make[8]: *** [scripts/Makefile.build:207: drivers/char/tpm/tpmrm-dev.o] Error 1
In file included from drivers/char/tpm/tpm-chip.c:24:
./include/linux/tpm_eventlog.h:167:6: error: variable 'mapping_size' set but not used [-Werror,-Wunused-but-set-variable]
167 | int mapping_size;
| ^
1 error generated.
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;
| ^
1 error generated.
make[8]: *** [scripts/Makefile.build:207: drivers/char/tpm/tpm-chip.o] Error 1
make[8]: *** [scripts/Makefile.build:207: drivers/char/tpm/tpm-sysfs.o] Error 1
In file included from drivers/char/tpm/tpm2-sessions.c:71:
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;
| ^
1 error generated.
make[8]: *** [scripts/Makefile.build:207: drivers/char/tpm/tpm2-sessions.o] Error 1
In file included from drivers/char/tpm/tpm-interface.c: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;
| ^
1 error generated.
make[8]: *** [scripts/Makefile.build:207: drivers/char/tpm/tpm-interface.o] Error 1
In file included from drivers/char/tpm/tpm2-space.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;
| ^
1 error generated.
make[8]: *** [scripts/Makefile.build:207: drivers/char/tpm/tpm2-space.o] Error 1
In file included from drivers/char/tpm/eventlog/tpm1.c:24:
./include/linux/tpm_eventlog.h:167:6: error: variable 'mapping_size' set but not used [-Werror,-Wunused-but-set-variable]
167 | int mapping_size;
| ^
1 error generated.
make[8]: *** [scripts/Makefile.build:207: drivers/char/tpm/eventlog/tpm1.o] Error 1
In file included from drivers/char/tpm/eventlog/common.c:20:
./include/linux/tpm_eventlog.h:167:6: error: variable 'mapping_size' set but not used [-Werror,-Wunused-but-set-variable]
167 | int mapping_size;
| ^
1 error generated.
make[8]: *** [scripts/Makefile.build:207: drivers/char/tpm/eventlog/common.o] Error 1
In file included from drivers/char/tpm/eventlog/tpm2.c:20:
./include/linux/tpm_eventlog.h:167:6: error: variable 'mapping_size' set but not used [-Werror,-Wunused-but-set-variable]
167 | int mapping_size;
| ^
1 error generated.
make[8]: *** [scripts/Makefile.build:207: drivers/char/tpm/eventlog/tpm2.o] Error 1
In file included from drivers/char/tpm/tpm_vtpm_proxy.c:24:
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;
| ^
1 error generated.
make[8]: *** [scripts/Makefile.build:207: drivers/char/tpm/tpm_vtpm_proxy.o] Error 1
make[7]: *** [scripts/Makefile.build:465: drivers/char/tpm] Error 2
make[6]: *** [scripts/Makefile.build:465: drivers/char] Error 2
make[6]: *** Waiting for unfinished jobs....
Suggested-by: Chen Linxuan <chenlinxuan@xxxxxxxxxxxxx>
Signed-off-by: WangYuli <wangyuli@xxxxxxxxxxxxx>
---
include/linux/tpm_eventlog.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/tpm_eventlog.h b/include/linux/tpm_eventlog.h
index 891368e82558..7ca58b2e96e8 100644
--- a/include/linux/tpm_eventlog.h
+++ b/include/linux/tpm_eventlog.h
@@ -164,7 +164,7 @@ static __always_inline u32 __calc_tpm2_event_size(struct tcg_pcr_event2_head *ev
struct tcg_efi_specid_event_head *efispecid;
struct tcg_event_field *event_field;
void *mapping = NULL;
- int mapping_size;
+ __maybe_unused int mapping_size;
void *marker;
void *marker_start;
u32 halg_size;
--
2.47.2