linux-kernel - [PATCH 06/46] Compiler Attributes, lto: introduce _

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Date:   Mon, 14 Nov 2022 12:43:04 +0100
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Andi Kleen <ak@...ux.intel.com>, Martin Liska <mliska@...e.cz>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 06/46] Compiler Attributes, lto: introduce __noreorder

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

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 */
-- 
2.38.1