linux-kernel - [PATCH 1/4] linux/export: Fix alignment for 64-bit ksymtab entries

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Date:   Wed, 22 Nov 2023 23:18:11 +0100
From:   deller@...nel.org
To:     linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, linux-modules@...r.kernel.org,
        linux-arch@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>
Subject: [PATCH 1/4] linux/export: Fix alignment for 64-bit ksymtab entries

From: Helge Deller <deller@....de>

An alignment of 4 bytes is wrong for 64-bit platforms which don't define
CONFIG_HAVE_ARCH_PREL32_RELOCATIONS (which then store 64-bit pointers).
Fix their alignment to 8 bytes.

Signed-off-by: Helge Deller <deller@....de>
---
 include/linux/export-internal.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/export-internal.h b/include/linux/export-internal.h
index 69501e0ec239..cd253eb51d6c 100644
--- a/include/linux/export-internal.h
+++ b/include/linux/export-internal.h
@@ -16,10 +16,13 @@
  * and eliminates the need for absolute relocations that require runtime
  * processing on relocatable kernels.
  */
+#define __KSYM_ALIGN		".balign 4"
 #define __KSYM_REF(sym)		".long " #sym "- ."
 #elif defined(CONFIG_64BIT)
+#define __KSYM_ALIGN		".balign 8"
 #define __KSYM_REF(sym)		".quad " #sym
 #else
+#define __KSYM_ALIGN		".balign 4"
 #define __KSYM_REF(sym)		".long " #sym
 #endif
 
@@ -42,7 +45,7 @@
 	    "	.asciz \"" ns "\""					"\n"	\
 	    "	.previous"						"\n"	\
 	    "	.section \"___ksymtab" sec "+" #name "\", \"a\""	"\n"	\
-	    "	.balign	4"						"\n"	\
+		__KSYM_ALIGN						"\n"	\
 	    "__ksymtab_" #name ":"					"\n"	\
 		__KSYM_REF(sym)						"\n"	\
 		__KSYM_REF(__kstrtab_ ##name)				"\n"	\
-- 
2.41.0