linux-kernel - [patch 1/4] fastboot: make fastboot a config option

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Date:	Sun, 20 Jul 2008 15:12:34 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	linux-kernel@...r.kernel.org
Cc:	Arjan van de Ven <arjan@...radead.org>, mingo@...e.hu,
	Simon Arlott <simon@...e.lp0.eu>,
	Daniel Walker <dwalker@...sta.com>,
	Rene Herman <rene.herman@...access.nl>
Subject: [patch 1/4] fastboot: make fastboot a config option


From: Arjan van de Ven <arjan@...ux.intel.com>
Date: Sun, 20 Jul 2008 10:20:49 -0700
Subject: [PATCH] fastboot: make fastboot a config option

to mitigate the risks of async bootup, make fastboot a configuration
option...

Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 init/Kconfig |   11 +++++++++++
 init/main.c  |    4 ++++
 2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index 6199d11..7545c8b 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -524,6 +524,17 @@ config CC_OPTIMIZE_FOR_SIZE
 
 	  If unsure, say N.
 
+config FASTBOOT
+	bool "Fast boot support"
+	help
+	  The fastboot option will cause the kernel to try to optimize
+	  for faster boot. 
+
+	  This includes doing some of the device initialization asynchronous
+	  as well as opportunistically trying to mount the root fs early.
+
+	  If unsure, say N.
+
 config SYSCTL
 	bool
 
diff --git a/init/main.c b/init/main.c
index 6be1756..bb97add 100644
--- a/init/main.c
+++ b/init/main.c
@@ -776,7 +776,11 @@ static void __init do_initcalls(void)
 	for (call = __initcall_start; call < __initcall_end; call++) {
 		if (phase == 0 && call >= __async_initcall_start) {
 			phase = 1;
+#ifdef CONFIG_FASTBOOT
 			queue_work(async_init_wq, &async_work);
+#else
+			do_async_initcalls(NULL);
+#endif
 		}
 		if (phase == 1 && call >= __async_initcall_end)
 			phase = 2;
-- 
1.5.5.1

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