linux-kernel - [PATCH v1 04/14] compiler: add unique LABEL

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Message-Id: <db3498efc33b3065a0acb534d034f7d33ad03e19.1699025537.git.tanyuan@tinylab.org>
Date:   Fri,  3 Nov 2023 23:59:11 +0800
From:   Yuan Tan <tanyuan@...ylab.org>
To:     falcon@...ylab.org, arnd@...db.de, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-riscv@...ts.infradead.org,
        luc.vanoostenryck@...il.com, linux-sparse@...r.kernel.org
Cc:     linux@...ssschuh.net, palmer@...osinc.com,
        paul.walmsley@...ive.com, paulburton@...nel.org,
        paulmck@...nel.org, tim.bird@...y.com, tsbogend@...ha.franken.de,
        w@....eu, tanyuan@...ylab.org, i@...kray.me
Subject: [PATCH v1 04/14] compiler: add unique LABEL_NAME()

From: Zhangjin Wu <falcon@...ylab.org>

unique LABEL is required by SHF_LINK_ORDER support.

Signed-off-by: Zhangjin Wu <falcon@...ylab.org>
---
 include/linux/compiler.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 5a9cc3209b12..b178f5d51ad6 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -246,6 +246,12 @@ static inline void *offset_to_ptr(const int *off)
 #endif
 #endif
 
+/* Unique Label NAME. */
+/* Label is file scope, __LINE__ is enough, and not change in the same macro call */
+#ifndef __LABEL_NAME
+# define __LABEL_NAME(prefix) __stringify(__PASTE(__PASTE(prefix, _), __LINE__))
+#endif
+
 /* &a[0] degrades to a pointer: a different type from an array */
 #define __must_be_array(a)	BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
 
-- 
2.34.1