linux-kernel - [PATCH] x86/mm: Fix warning on build with X86_MEM

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Message-Id: <20220126115919.7691-1-kirill.shutemov@linux.intel.com>
Date:   Wed, 26 Jan 2022 14:59:19 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com
Cc:     x86@...nel.org, thomas.lendacky@....com, lkp@...el.com,
        ak@...ux.intel.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        sathyanarayanan.kuppuswamy@...ux.intel.com, tony.luck@...el.com,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH] x86/mm: Fix warning on build with X86_MEM_ENCRYPT=y

So far, AMD_MEM_ENCRYPT is the only user of X86_MEM_ENCRYPT. TDX will be
the second. It will make mem_encrypt.c build without AMD_MEM_ENCRYPT,
which triggers a warning:

arch/x86/mm/mem_encrypt.c:69:13: warning: no previous prototype for
	function 'mem_encrypt_init' [-Wmissing-prototypes]

Fix it by moving mem_encrypt_init() declaration outside of #ifdef
CONFIG_AMD_MEM_ENCRYPT.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Fixes: 20f07a044a76 ("x86/sev: Move common memory encryption code to mem_encrypt.c")
---
 arch/x86/include/asm/mem_encrypt.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h
index e2c6f433ed10..88ceaf3648b3 100644
--- a/arch/x86/include/asm/mem_encrypt.h
+++ b/arch/x86/include/asm/mem_encrypt.h
@@ -49,9 +49,6 @@ void __init early_set_mem_enc_dec_hypercall(unsigned long vaddr, int npages,
 
 void __init mem_encrypt_free_decrypted_mem(void);
 
-/* Architecture __weak replacement functions */
-void __init mem_encrypt_init(void);
-
 void __init sev_es_init_vc_handling(void);
 
 #define __bss_decrypted __section(".bss..decrypted")
@@ -89,6 +86,9 @@ static inline void mem_encrypt_free_decrypted_mem(void) { }
 
 #endif	/* CONFIG_AMD_MEM_ENCRYPT */
 
+/* Architecture __weak replacement functions */
+void __init mem_encrypt_init(void);
+
 /*
  * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when
  * writing to or comparing values from the cr3 register.  Having the
-- 
2.34.1