linux-kernel - [PATCH 23/46] init.h, lto: mark initcalls as _

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Date:   Mon, 14 Nov 2022 12:43:21 +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 23/46] init.h, lto: mark initcalls as __noreorder

From: Andi Kleen <ak@...ux.intel.com>

Kernels don't like any reordering of initcalls between files, as several
initcalls depend on each other. LTO is allowed to reorder as it wishes
and previously needed to use -fno-toplevel-reordering to prevent boot
failures. Now we can use __noreorder per symbol. So mark initcall
functions as such.

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/init.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/init.h b/include/linux/init.h
index 077d7f93b402..ca827e2fb0da 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -246,7 +246,7 @@ extern bool initcall_debug;
 	static_assert(__same_type(initcall_t, &fn));
 #else
 #define ____define_initcall(fn, __unused, __name, __sec)	\
-	static initcall_t __name __used 			\
+	static initcall_t __name __used __noreorder 		\
 		__attribute__((__section__(__sec))) = fn;
 #endif
 
-- 
2.38.1