[PATCH] livepatch: apply_alternatives() is only used for livepatch

[Roger Pau Monne]

Guard it with CONFIG_LIVEPATCH.  Note alternatives are applied at boot
using _apply_alternatives().

Signed-off-by: Roger Pau Monné <roger....@citrix.com>
---
 xen/arch/arm/alternative.c             | 2 ++
 xen/arch/arm/include/asm/alternative.h | 2 ++
 xen/arch/x86/alternative.c             | 5 +++--
 xen/arch/x86/include/asm/alternative.h | 2 ++
 4 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/alternative.c b/xen/arch/arm/alternative.c
index 7366af4ea646..016e66978b6d 100644
--- a/xen/arch/arm/alternative.c
+++ b/xen/arch/arm/alternative.c
@@ -223,6 +223,7 @@ void __init apply_alternatives_all(void)
     vunmap(xenmap);
 }
 
+#ifdef CONFIG_LIVEPATCH
 int apply_alternatives(const struct alt_instr *start, const struct alt_instr 
*end)
 {
     const struct alt_region region = {
@@ -232,6 +233,7 @@ int apply_alternatives(const struct alt_instr *start, const 
struct alt_instr *en
 
     return __apply_alternatives(&region, 0);
 }
+#endif
 
 /*
  * Local variables:
diff --git a/xen/arch/arm/include/asm/alternative.h 
b/xen/arch/arm/include/asm/alternative.h
index d3210e82f9e5..ce82dc1ca0d2 100644
--- a/xen/arch/arm/include/asm/alternative.h
+++ b/xen/arch/arm/include/asm/alternative.h
@@ -29,7 +29,9 @@ typedef void (*alternative_cb_t)(const struct alt_instr *alt,
                                 int nr_inst);
 
 void apply_alternatives_all(void);
+#ifdef CONFIG_LIVEPATCH
 int apply_alternatives(const struct alt_instr *start, const struct alt_instr 
*end);
+#endif
 
 #define ALTINSTR_ENTRY(feature, cb)                                          \
        " .word 661b - .\n"                             /* label           */ \
diff --git a/xen/arch/x86/alternative.c b/xen/arch/x86/alternative.c
index 99482766b51f..21af0e825822 100644
--- a/xen/arch/x86/alternative.c
+++ b/xen/arch/x86/alternative.c
@@ -358,11 +358,12 @@ static void init_or_livepatch _apply_alternatives(struct 
alt_instr *start,
     }
 }
 
-void init_or_livepatch apply_alternatives(struct alt_instr *start,
-                                          struct alt_instr *end)
+#ifdef CONFIG_LIVEPATCH
+void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
 {
     _apply_alternatives(start, end, true);
 }
+#endif
 
 static unsigned int __initdata alt_todo;
 static unsigned int __initdata alt_done;
diff --git a/xen/arch/x86/include/asm/alternative.h 
b/xen/arch/x86/include/asm/alternative.h
index a1cd6a9fe5b8..688b554099b3 100644
--- a/xen/arch/x86/include/asm/alternative.h
+++ b/xen/arch/x86/include/asm/alternative.h
@@ -24,7 +24,9 @@ struct __packed alt_instr {
 
 extern void add_nops(void *insns, unsigned int len);
 /* Similar to alternative_instructions except it can be run with IRQs enabled. 
*/
+#ifdef CONFIG_LIVEPATCH
 extern void apply_alternatives(struct alt_instr *start, struct alt_instr *end);
+#endif
 extern void alternative_instructions(void);
 extern void alternative_branches(void);
 
-- 
2.40.0