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authorVivek Goyal <vgoyal@in.ibm.com>2006-09-27 04:50:44 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-27 11:26:17 -0400
commit7e96287ddc4f42081e18248b6167041c0908004c (patch)
tree6c890798c6c7093c74e3c44324d29ae99fade24f /init/main.c
parentbcdc5e019d9f525a9f181a7de642d3a9c27c7610 (diff)
[PATCH] kdump: introduce "reset_devices" command line option
Resetting the devices during driver initialization can be a costly operation in terms of time (especially scsi devices). This option can be used by drivers to know that user forcibly wants the devices to be reset during initialization. This option can be useful while kernel is booting in unreliable environment. For ex. during kdump boot where devices are in unknown random state and BIOS execution has been skipped. Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'init/main.c')
-rw-r--r--init/main.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c
index 913e48d658ee..0766e69712b2 100644
--- a/init/main.c
+++ b/init/main.c
@@ -128,6 +128,18 @@ static char *ramdisk_execute_command;
128static unsigned int max_cpus = NR_CPUS; 128static unsigned int max_cpus = NR_CPUS;
129 129
130/* 130/*
131 * If set, this is an indication to the drivers that reset the underlying
132 * device before going ahead with the initialization otherwise driver might
133 * rely on the BIOS and skip the reset operation.
134 *
135 * This is useful if kernel is booting in an unreliable environment.
136 * For ex. kdump situaiton where previous kernel has crashed, BIOS has been
137 * skipped and devices will be in unknown state.
138 */
139unsigned int reset_devices;
140EXPORT_SYMBOL(reset_devices);
141
142/*
131 * Setup routine for controlling SMP activation 143 * Setup routine for controlling SMP activation
132 * 144 *
133 * Command-line option of "nosmp" or "maxcpus=0" will disable SMP 145 * Command-line option of "nosmp" or "maxcpus=0" will disable SMP
@@ -153,6 +165,14 @@ static int __init maxcpus(char *str)
153 165
154__setup("maxcpus=", maxcpus); 166__setup("maxcpus=", maxcpus);
155 167
168static int __init set_reset_devices(char *str)
169{
170 reset_devices = 1;
171 return 1;
172}
173
174__setup("reset_devices", set_reset_devices);
175
156static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; 176static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
157char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; 177char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
158static const char *panic_later, *panic_param; 178static const char *panic_later, *panic_param;