diff mbox series

[06/46] Compiler Attributes, lto: introduce __noreorder

Message ID 20221114114344.18650-7-jirislaby@kernel.org
State New
Headers
Series gcc-LTO support for the kernel |

Commit Message

Jiri Slaby Nov. 14, 2022, 11:43 a.m. UTC 
  From: Andi Kleen <ak@linux.intel.com>

gcc 5 has a new no_reorder attribute that prevents top level reordering
only for that symbol. So add a new __noreorder wrapper for the
no_reorder attribute. This will be used in the next patches to support
gcc LTO.

[js] split this to introduction & use

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Martin Liska <mliska@suse.cz>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 include/linux/compiler_attributes.h | 10 ++++++++++
 1 file changed, 10 insertions(+)
diff mbox series

Patch

diff --git a/include/linux/compiler_attributes.h b/include/linux/compiler_attributes.h
index 898b3458b24a..be6c71fd5ebb 100644
--- a/include/linux/compiler_attributes.h
+++ b/include/linux/compiler_attributes.h
@@ -379,4 +379,14 @@ 
  */
 #define __fix_address noinline __noclone
 
+/*
+ * https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#Common-Function-Attributes
+ */
+
+#if __has_attribute(__no_reorder__)
+#define __noreorder			__attribute__((no_reorder))
+#else
+#define __noreorder
+#endif
+
 #endif /* __LINUX_COMPILER_ATTRIBUTES_H */