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linux-yocto-tiny-kexecboot: revert Yocto specific console check

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Revert Yocto-specific : "check console device file on fs when booting".
Fix kernel panic at boot because of the missing /dev/console.

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
This commit is contained in:
Andrea Adami 2016-02-28 23:51:25 +01:00 committed by Martin Jansa
parent c62f4c141a
commit 7183bacd5c
2 changed files with 49 additions and 0 deletions
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47
meta-initramfs/recipes-kernel/linux/linux-yocto-tiny-kexecboot/revert-check-console.patch Normal file
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@ -0,0 +1,47 @@
From a74e0bf51adcc867b73fc44050eb9bde985c9cba Mon Sep 17 00:00:00 2001
From: Andrea Adami <andrea.adami@gmail.com>
Date: Sun, 28 Feb 2016 01:09:19 +0100
Subject: [PATCH] main.c: revert check on console device
Fix kernel panic because of the missing /dev/console.
Revert Yocto-specific : "check console device file on fs when booting".
The initramfs used in this kernel needs to be of the smallest possible
size so we save a few kb by deploying an empty /dev which is populated
after boot by the init (kexecboot checks and recreates the devices
with or without devtmpfs).
Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
---
init/main.c | 7 -------
1 file changed, 7 deletions(-)
diff --git a/init/main.c b/init/main.c
index d191d2a..9e64d70 100644
--- a/init/main.c
+++ b/init/main.c
@@ -976,7 +976,6 @@ static int __ref kernel_init(void *unused)
static noinline void __init kernel_init_freeable(void)
{
- struct stat console_stat;
/*
* Wait until kthreadd is all set-up.
*/
@@ -1008,12 +1007,6 @@ static noinline void __init kernel_init_freeable(void)
do_basic_setup();
- /* Use /dev/console to infer if the rootfs is setup properly */
- if (sys_newlstat((char __user *) "/dev/console", (struct stat __user *) &console_stat)
- || !S_ISCHR(console_stat.st_mode)) {
- panic("/dev/console is missing or not a character device!\nPlease ensure your rootfs is properly configured\n");
- }
-
/* Open the /dev/console on the rootfs, this should never fail */
if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
pr_err("Warning: unable to open an initial console.\n");
--
1.9.1

2
meta-initramfs/recipes-kernel/linux/linux-yocto-tiny-kexecboot_4.4.bb
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@ -1,6 +1,8 @@
require recipes-kernel/linux/linux-yocto-tiny_${PV}.bb
SUMMARY = "Yocto tiny kernel embedding a minimalistic kexecboot initramfs"
SRC_URI += "file://revert-check-console.patch"
PACKAGES = ""
PROVIDES = ""