[PATCH] tpm: require to compile as part of the kernel

[Jarkko Sakkinen]

Do not allow to compile TPM core as a module. TPM defines a root of
trust for integrity and keyring subsystems and should be always
available and not be loaded from the user space. There is no a
reasonable use case for a loadable module existing.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
---
 drivers/char/tpm/Kconfig | 2 +-
 include/linux/tpm.h      | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index 18c81cbe4704..9728771aecbd 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -3,7 +3,7 @@
 #
 
 menuconfig TCG_TPM
-	tristate "TPM Hardware Support"
+	bool "TPM Hardware Support"
 	depends on HAS_IOMEM
 	select SECURITYFS
 	select CRYPTO
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index 4609b94142d4..cefa61b12891 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -50,8 +50,7 @@ struct tpm_class_ops {
 	void (*clk_enable)(struct tpm_chip *chip, bool value);
 };
 
-#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
-
+#if defined(CONFIG_TCG_TPM)
 extern int tpm_is_tpm2(struct tpm_chip *chip);
 extern int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
 extern int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
-- 
2.17.1