[PATCH v3 1/2] x86/sgx: Add the missing ifdef for sgx_set_attribute()

[Jarkko Sakkinen <jarkko@kernel.org>]

Similarly as sgx_virt_*, decorate sgx_set_attribute() with ifdef, so that
calling it without appropraite config flags, will cause a compilation
error, and not a linking error.

Fixes: b3754e5d3da3 ("x86/sgx: Move provisioning device creation out of SGX driver")
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

---
v3:
* Since CONFIG_X86_SGX_KVM depends on CONFIG_X86_SGX surround everything
  with CONFIG_X86_SGX config flag.
  Link: https://lore.kernel.org/linux-sgx/YR6Bs2twT4EK%2FjUK@google.com/
---
 arch/x86/include/asm/sgx.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/sgx.h b/arch/x86/include/asm/sgx.h
index 05f3e21f01a7..996e56590a10 100644
--- a/arch/x86/include/asm/sgx.h
+++ b/arch/x86/include/asm/sgx.h
@@ -365,6 +365,11 @@ struct sgx_sigstruct {
  * comment!
  */
 
+#ifdef CONFIG_X86_SGX
+
+int sgx_set_attribute(unsigned long *allowed_attributes,
+		      unsigned int attribute_fd);
+
 #ifdef CONFIG_X86_SGX_KVM
 int sgx_virt_ecreate(struct sgx_pageinfo *pageinfo, void __user *secs,
 		     int *trapnr);
@@ -372,7 +377,6 @@ int sgx_virt_einit(void __user *sigstruct, void __user *token,
 		   void __user *secs, u64 *lepubkeyhash, int *trapnr);
 #endif
 
-int sgx_set_attribute(unsigned long *allowed_attributes,
-		      unsigned int attribute_fd);
+#endif /* CONFIG_X86_SGX */
 
 #endif /* _ASM_X86_SGX_H */
-- 
2.25.1