linux-kernel - [PATCH v2] kernel/modsign_certificate.S: use real contents instead of macro GLOBAL()

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Date:	Tue, 29 Oct 2013 10:17:50 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Joern Rennecke <joern.rennecke@...ecosm.com>,
	James Hogan <james.hogan@...tec.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Takashi Iwai <tiwai@...e.de>
CC:	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	"jeremy.bennett@...ecosm.com" <jeremy.bennett@...ecosm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Claudiu Zissulescu <Claudiu.Zissulescu@...opsys.com>,
	Francois Bedard <Francois.Bedard@...opsys.com>,
	Max Filippov <jcmvbkbc@...il.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v2] kernel/modsign_certificate.S: use real contents instead
 of macro GLOBAL()

If a macro is only used within 2 times, and also its contents are
within 2 lines, recommend to expand it to shrink code line.

For our case, the macro is not portable either: some architectures'
assembler may use another character to mark newline in a macro (e.g.
'`' for arc), which will cause issue (e.g. arc with allmodconfig):

    LD      init/built-in.o
  kernel/built-in.o: In function `load_module_signing_keys':
  kernel/modsign_pubkey.c:66: undefined reference to `modsign_certificate_list'
  kernel/modsign_pubkey.c:71: undefined reference to `modsign_certificate_list_end'
  kernel/modsign_pubkey.c:67: undefined reference to `modsign_certificate_list_end'

If still want to use macro and let it portable enough, it will need
additional line -- include additional header file (e.g "#include
<linux/linkage.h>", although it also need be fixed).


Signed-off-by: Chen Gang <gang.chen@...anux.com>
---
 kernel/modsign_certificate.S |   10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/kernel/modsign_certificate.S b/kernel/modsign_certificate.S
index 4a9a86d..1967dcd 100644
--- a/kernel/modsign_certificate.S
+++ b/kernel/modsign_certificate.S
@@ -1,12 +1,10 @@
 #include <linux/export.h>
 
-#define GLOBAL(name)	\
-	.globl VMLINUX_SYMBOL(name);	\
-	VMLINUX_SYMBOL(name):
-
 	.section ".init.data","aw"
 
-GLOBAL(modsign_certificate_list)
+	.globl VMLINUX_SYMBOL(modsign_certificate_list)
+VMLINUX_SYMBOL(modsign_certificate_list):
 	.incbin "signing_key.x509"
 	.incbin "extra_certificates"
-GLOBAL(modsign_certificate_list_end)
+	.globl VMLINUX_SYMBOL(modsign_certificate_list_end)
+VMLINUX_SYMBOL(modsign_certificate_list_end):
-- 
1.7.7.6


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