Detect missing symbols used with kallsyms_lookup at compile time

[lttng-modules.git] / wrapper / vmalloc.h

diff --git a/wrapper/vmalloc.h b/wrapper/vmalloc.h
index 2a7b341bf6f93c13affeec6bafba01ee85c9b1c7..362054b162b9e80eab799ca9be66298a697bb068 100644 (file)
--- a/wrapper/vmalloc.h
+++ b/wrapper/vmalloc.h
@@ -22,7 +22,17 @@
 #include <wrapper/kallsyms.h>
 #include <lttng-kernel-version.h>
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,8,0))
+
+/*
+ * wrapper_vmalloc_sync_mappings was removed in v5.8, the vmalloc mappings
+ * are now synchronized when they are created or torn down.
+ */
+static inline
+void wrapper_vmalloc_sync_mappings(void)
+{}
+
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
   || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0)            \
   || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0)            \
   || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0)            \
@@ -54,10 +64,23 @@ void wrapper_vmalloc_sync_mappings(void)
        }
 }
 
+/*
+ * Canary function to check for 'vmalloc_sync_mappings()' at compile time.
+ *
+ * From 'include/linux/vmalloc.h':
+ *
+ *   void vmalloc_sync_mappings(void);
+ */
+static inline
+void __canary__vmalloc_sync_mappings(void)
+{
+       vmalloc_sync_mappings();
+}
+
 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
 
 /*
- * Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.7.
+ * Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.6.
  */
 static inline
 void wrapper_vmalloc_sync_mappings(void)
@@ -79,6 +102,19 @@ void wrapper_vmalloc_sync_mappings(void)
        }
 }
 
+/*
+ * Canary function to check for 'vmalloc_sync_all()' at compile time.
+ *
+ * From 'include/linux/vmalloc.h':
+ *
+ *   void vmalloc_sync_all(void);
+ */
+static inline
+void __canary__vmalloc_sync_all(void)
+{
+       vmalloc_sync_all();
+}
+
 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
 
 #else
@@ -194,6 +230,26 @@ void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align,
        return __vmalloc(size, gfp_mask, prot);
 }
 
+/*
+ * Canary function to check for '__vmalloc_node_range()' at compile time.
+ *
+ * From 'include/linux/vmalloc.h':
+ *
+ *   extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
+ *                           unsigned long start, unsigned long end, gfp_t gfp_mask,
+ *                           pgprot_t prot, unsigned long vm_flags, int node,
+ *                           const void *caller);
+ */
+static inline
+void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align,
+                       unsigned long start, unsigned long end, gfp_t gfp_mask,
+                       pgprot_t prot, unsigned long vm_flags, int node,
+                       const void *caller)
+{
+       return __vmalloc_node_range(size, align, start, end, gfp_mask, prot,
+                       vm_flags, node, caller);
+}
+
 /**
  * lttng_kvmalloc_node - attempt to allocate physically contiguous memory, but upon
  * failure, fall back to non-contiguous (vmalloc) allocation.