1 files changed, 18 insertions, 0 deletions

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index de7353c0ce9c..e63b80e5861c 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -390,6 +390,24 @@ void alternatives_smp_switch(int smp)
         mutex_unlock(&smp_alt);
 }
 
+/* Return 1 if the address range is reserved for smp-alternatives */
+int alternatives_text_reserved(void *start, void *end)
+{
+        struct smp_alt_module *mod;
+        u8 **ptr;
+        u8 *text_start = start;
+        u8 *text_end = end;
+
+        list_for_each_entry(mod, &smp_alt_modules, next) {
+                if (mod->text > text_end || mod->text_end < text_start)
+                        continue;
+                for (ptr = mod->locks; ptr < mod->locks_end; ptr++)
+                        if (text_start <= *ptr && text_end >= *ptr)
+                                return 1;
+        }
+
+        return 0;
+}
 #endif
 
 #ifdef CONFIG_PARAVIRT