linux-kernel - Re: [akpm-mm:mm-unstable 302/323] arch/x86/mm/pgprot.c:26:6: warning: no previous prototype for 'add_encrypt_protection

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Date:   Sat, 2 Jul 2022 13:26:32 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        Christoph Hellwig <hch@....de>
Subject: Re: [akpm-mm:mm-unstable 302/323] arch/x86/mm/pgprot.c:26:6:
 warning: no previous prototype for 'add_encrypt_protection_map'

On Sat, 2 Jul 2022 16:32:52 +0800 kernel test robot <lkp@...el.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
> head:   706370e5c2ea7bb4544eee6e1172c4d68117a526
> commit: d845587c05fd4ae52aaa0cd5c8939e8f4793301f [302/323] x86/mm: move protection_map[] inside the platform
> config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20220702/202207021647.Jb0wNWF5-lkp@intel.com/config)
> compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
> reproduce (this is a W=1 build):
>         # https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/commit/?id=d845587c05fd4ae52aaa0cd5c8939e8f4793301f
>         git remote add akpm-mm https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git
>         git fetch --no-tags akpm-mm mm-unstable
>         git checkout d845587c05fd4ae52aaa0cd5c8939e8f4793301f
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/mm/
> 
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):
> 
> >> arch/x86/mm/pgprot.c:26:6: warning: no previous prototype for 'add_encrypt_protection_map' [-Wmissing-prototypes]
>       26 | void add_encrypt_protection_map(void)
>          |      ^~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> 
> vim +/add_encrypt_protection_map +26 arch/x86/mm/pgprot.c
> 
>     25	
>   > 26	void add_encrypt_protection_map(void)
>     27	{
>     28		unsigned int i;
>     29	
>     30		for (i = 0; i < ARRAY_SIZE(protection_map); i++)
>     31			protection_map[i] = pgprot_encrypted(protection_map[i]);
>     32	}
>     33	

Something like this?


 arch/x86/include/asm/mem_encrypt.h |    2 ++
 arch/x86/mm/mem_encrypt_amd.c      |    3 +--
 arch/x86/mm/pgprot.c               |    1 +
 3 files changed, 4 insertions(+), 2 deletions(-)

--- a/arch/x86/include/asm/mem_encrypt.h~x86-mm-move-protection_map-inside-the-platform-fix
+++ a/arch/x86/include/asm/mem_encrypt.h
@@ -89,6 +89,8 @@ static inline void mem_encrypt_free_decr
 /* Architecture __weak replacement functions */
 void __init mem_encrypt_init(void);
 
+void add_encrypt_protection_map(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
--- a/arch/x86/mm/mem_encrypt_amd.c~x86-mm-move-protection_map-inside-the-platform-fix
+++ a/arch/x86/mm/mem_encrypt_amd.c
@@ -26,6 +26,7 @@
 #include <asm/tlbflush.h>
 #include <asm/fixmap.h>
 #include <asm/setup.h>
+#include <asm/mem_encrypt.h>
 #include <asm/bootparam.h>
 #include <asm/set_memory.h>
 #include <asm/cacheflush.h>
@@ -484,8 +485,6 @@ void __init early_set_mem_enc_dec_hyperc
 	enc_dec_hypercall(vaddr, npages, enc);
 }
 
-void add_encrypt_protection_map(void);
-
 void __init sme_early_init(void)
 {
 	if (!sme_me_mask)
--- a/arch/x86/mm/pgprot.c~x86-mm-move-protection_map-inside-the-platform-fix
+++ a/arch/x86/mm/pgprot.c
@@ -3,6 +3,7 @@
 #include <linux/export.h>
 #include <linux/mm.h>
 #include <asm/pgtable.h>
+#include <asm/mem_encrypt.h>
 
 static pgprot_t protection_map[16] __ro_after_init = {
 	[VM_NONE]					= PAGE_NONE,
_