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Subject[PATCH] x86/mm: Fix -Wmissing-prototypes warning in init.c
Date
Fix -Wmissing-prototypes warning by including the respective header containing prototypes:

arch/x86/mm/init.c:81:6:
warning: no previous prototype for ‘x86_has_pat_wp’ [-Wmissing-prototypes]
bool x86_has_pat_wp(void)

arch/x86/mm/init.c:86:22:
warning: no previous prototype for ‘pgprot2cachemode’ [-Wmissing-prototypes]
enum page_cache_mode pgprot2cachemode(pgprot_t pgprot)

Fix:

arch/x86/mm/init.c:893:13:
warning: no previous prototype for ‘mem_encrypt_free_decrypted_mem’ [-Wmissing-prototypes]
void __weak mem_encrypt_free_decrypted_mem(void) { }

by making it static inline for the !CONFIG_AMD_MEM_ENCRYPT case.
This warning happens when CONFIG_AMD_MEM_ENCRYPT is not enabled (defconfig for example):

./arch/x86/include/asm/mem_encrypt.h:80:27:
warning: inline function ‘mem_encrypt_free_decrypted_mem’ declared weak [-Wattributes]
static inline void __weak mem_encrypt_free_decrypted_mem(void) { }
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
It's ok to convert to static inline because the function is only use in x86.
Is not shared with other architectures so that it is not necessary to be __weak.

Signed-off-by: Benjamin Thiel <b.thiel@posteo.de>
---
arch/x86/include/asm/mem_encrypt.h | 2 ++
arch/x86/mm/init.c | 3 +--
2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h
index 848ce43b9040..8e8140cfded9 100644
--- a/arch/x86/include/asm/mem_encrypt.h
+++ b/arch/x86/include/asm/mem_encrypt.h
@@ -77,6 +77,8 @@ early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0;
static inline int __init
early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; }

+static inline void mem_encrypt_free_decrypted_mem(void) { }
+
#define __bss_decrypted

#endif /* CONFIG_AMD_MEM_ENCRYPT */
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 112d3b98a3b6..a751b15f89c0 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -25,6 +25,7 @@
#include <asm/cpufeature.h>
#include <asm/pti.h>
#include <asm/text-patching.h>
+#include <asm/memtype.h>

/*
* We need to define the tracepoints somewhere, and tlb.c
@@ -890,8 +891,6 @@ void free_kernel_image_pages(const char *what, void *begin, void *end)
set_memory_np_noalias(begin_ul, len_pages);
}

-void __weak mem_encrypt_free_decrypted_mem(void) { }
-
void __ref free_initmem(void)
{
e820__reallocate_tables();
--
2.20.1
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