net/mlx5: Fix use-after-free in self-healing flow

[linux-2.6-block.git] / include / linux / tracepoint.h

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index d9a084c72541c0ea1c39823687bfcb33289fa580..7f2e16e76ac476b4fb07223af23d15490c14b4d4 100644 (file)
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -249,6 +249,19 @@ extern void syscall_unregfunc(void);
                return static_key_false(&__tracepoint_##name.key);      \
        }
 
+#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
+#define __TRACEPOINT_ENTRY(name)                                       \
+       asm("   .section \"__tracepoints_ptrs\", \"a\"          \n"     \
+           "   .balign 4                                       \n"     \
+           "   .long   __tracepoint_" #name " - .              \n"     \
+           "   .previous                                       \n")
+#else
+#define __TRACEPOINT_ENTRY(name)                                        \
+       static struct tracepoint * const __tracepoint_ptr_##name __used  \
+       __attribute__((section("__tracepoints_ptrs"))) =                 \
+               &__tracepoint_##name
+#endif
+
 /*
  * We have no guarantee that gcc and the linker won't up-align the tracepoint
  * structures, so we create an array of pointers that will be used for iteration
@@ -258,11 +271,9 @@ extern void syscall_unregfunc(void);
        static const char __tpstrtab_##name[]                            \
        __attribute__((section("__tracepoints_strings"))) = #name;       \
        struct tracepoint __tracepoint_##name                            \
-       __attribute__((section("__tracepoints"))) =                      \
+       __attribute__((section("__tracepoints"), used)) =                \
                { __tpstrtab_##name, STATIC_KEY_INIT_FALSE, reg, unreg, NULL };\
-       static struct tracepoint * const __tracepoint_ptr_##name __used  \
-       __attribute__((section("__tracepoints_ptrs"))) =                 \
-               &__tracepoint_##name;
+       __TRACEPOINT_ENTRY(name);
 
 #define DEFINE_TRACE(name)                                             \
        DEFINE_TRACE_FN(name, NULL, NULL);