linux-kernel - [PATCH 01/32] Compiler Attributes: add _

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Message-Id: <20230509165657.1735798-2-kent.overstreet@linux.dev>
Date:   Tue,  9 May 2023 12:56:26 -0400
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-bcachefs@...r.kernel.org
Cc:     Kent Overstreet <kent.overstreet@...il.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Kent Overstreet <kent.overstreet@...ux.dev>
Subject: [PATCH 01/32] Compiler Attributes: add __flatten

From: Kent Overstreet <kent.overstreet@...il.com>

This makes __attribute__((flatten)) available, which is used by
bcachefs.

Signed-off-by: Kent Overstreet <kent.overstreet@...il.com>
Cc: Miguel Ojeda <ojeda@...nel.org> (maintainer:COMPILER ATTRIBUTES)
Cc: Nick Desaulniers <ndesaulniers@...gle.com> (reviewer:COMPILER ATTRIBUTES)
Signed-off-by: Kent Overstreet <kent.overstreet@...ux.dev>
---
 include/linux/compiler_attributes.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/compiler_attributes.h b/include/linux/compiler_attributes.h
index e659cb6fde..e56793bc08 100644
--- a/include/linux/compiler_attributes.h
+++ b/include/linux/compiler_attributes.h
@@ -366,4 +366,9 @@
  */
 #define __fix_address noinline __noclone
 
+/*
+ *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-flatten-function-attribute
+ */
+#define __flatten __attribute__((flatten))
+
 #endif /* __LINUX_COMPILER_ATTRIBUTES_H */
-- 
2.40.1