livepatch, arm[32|64]: Share arch_livepatch_revert

It is exactly the same in both platforms.

No functional change.

Acked-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

xen/arch/arm/arm32/livepatch.c

@@ -75,18 +75,7 @@ void arch_livepatch_apply(struct livepatch_func *func)
     clean_and_invalidate_dcache_va_range(new_ptr, sizeof (*new_ptr) * len);
 }
 
-void arch_livepatch_revert(const struct livepatch_func *func)
-{
-    uint32_t *new_ptr;
-    unsigned int len;
-
-    new_ptr = func->old_addr - (void *)_start + vmap_of_xen_text;
-
-    len = livepatch_insn_len(func);
-    memcpy(new_ptr, func->opaque, len);
-
-    clean_and_invalidate_dcache_va_range(new_ptr, len);
-}
+/* arch_livepatch_revert shared with ARM 32/ARM 64. */
 
 int arch_livepatch_verify_elf(const struct livepatch_elf *elf)
 {

xen/arch/arm/arm64/livepatch.c

@@ -62,18 +62,7 @@ void arch_livepatch_apply(struct livepatch_func *func)
     clean_and_invalidate_dcache_va_range(new_ptr, sizeof (*new_ptr) * len);
 }
 
-void arch_livepatch_revert(const struct livepatch_func *func)
-{
-    uint32_t *new_ptr;
-    unsigned int len;
-
-    new_ptr = func->old_addr - (void *)_start + vmap_of_xen_text;
-
-    len = livepatch_insn_len(func);
-    memcpy(new_ptr, func->opaque, len);
-
-    clean_and_invalidate_dcache_va_range(new_ptr, len);
-}
+/* arch_livepatch_revert shared with ARM 32/ARM 64. */
 
 int arch_livepatch_verify_elf(const struct livepatch_elf *elf)
 {

xen/arch/arm/livepatch.c

@@ -69,6 +69,19 @@ int arch_livepatch_verify_func(const struct livepatch_func *func)
     return 0;
 }
 
+void arch_livepatch_revert(const struct livepatch_func *func)
+{
+    uint32_t *new_ptr;
+    unsigned int len;
+
+    new_ptr = func->old_addr - (void *)_start + vmap_of_xen_text;
+
+    len = livepatch_insn_len(func);
+    memcpy(new_ptr, func->opaque, len);
+
+    clean_and_invalidate_dcache_va_range(new_ptr, len);
+}
+
 void arch_livepatch_post_action(void)
 {
     /* arch_livepatch_revive has nuked the instruction cache. */