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From:   Christophe Leroy <christophe.leroy@c-s.fr>
Subject: [PATCH 6/9] Add capability to prepend the command line
To:     Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>, danielwa@cisco.com
Cc:     linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-arch@vger.kernel.org
Date:   Tue,  2 Apr 2019 09:08:40 +0000 (UTC)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

This patchs adds an option of prepend a text to the command
line instead of appending it.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
 include/linux/cmdline.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/cmdline.h b/include/linux/cmdline.h
index afcc00d7628d..5caf3724c1ab 100644
--- a/include/linux/cmdline.h
+++ b/include/linux/cmdline.h
@@ -3,7 +3,7 @@
 #define _LINUX_CMDLINE_H
 
 /*
- * This function will append a builtin command line to the command
+ * This function will append or prepend a builtin command line to the command
  * line provided by the bootloader. Kconfig options can be used to alter
  * the behavior of this builtin command line.
  * @dest: The destination of the final appended/prepended string.
@@ -22,6 +22,9 @@ static __always_inline void cmdline_build(char *dest, const char *src, size_t le
 		strlcat(dest, CONFIG_CMDLINE, length);
 		return;
 	}
+
+	if (IS_ENABLED(CONFIG_CMDLINE_PREPEND) && sizeof(CONFIG_CMDLINE) > 1)
+		strlcat(dest, CONFIG_CMDLINE " ", length);
 #endif
 	if (dest != src)
 		strlcat(dest, src, length);
-- 
2.13.3