The patch titled
kdump: introduce "reset_devices" command line option
has been removed from the -mm tree. Its filename is
kdump-introduce-reset_devices-command-line-option.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: kdump: introduce "reset_devices" command line option
From: Vivek Goyal <vgoyal@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
Documentation/kernel-parameters.txt | 3 +++
include/linux/init.h | 1 +
init/main.c | 20 ++++++++++++++++++++
3 files changed, 24 insertions(+)
diff -puN Documentation/kernel-parameters.txt~kdump-introduce-reset_devices-command-line-option Documentation/kernel-parameters.txt
--- a/Documentation/kernel-parameters.txt~kdump-introduce-reset_devices-command-line-option
+++ a/Documentation/kernel-parameters.txt
@@ -1372,6 +1372,9 @@ running once the system is up.
Reserves a hole at the top of the kernel virtual
address space.
+ reset_devices [KNL] Force drivers to reset the underlying device
+ during initialization.
+
resume= [SWSUSP]
Specify the partition device for software suspend
diff -puN include/linux/init.h~kdump-introduce-reset_devices-command-line-option include/linux/init.h
--- a/include/linux/init.h~kdump-introduce-reset_devices-command-line-option
+++ a/include/linux/init.h
@@ -68,6 +68,7 @@ extern initcall_t __security_initcall_st
/* Defined in init/main.c */
extern char saved_command_line[];
+extern unsigned int reset_devices;
/* used by init/main.c */
extern void setup_arch(char **);
diff -puN init/main.c~kdump-introduce-reset_devices-command-line-option init/main.c
--- a/init/main.c~kdump-introduce-reset_devices-command-line-option
+++ a/init/main.c
@@ -128,6 +128,18 @@ static char *ramdisk_execute_command;
static unsigned int max_cpus = NR_CPUS;
/*
+ * If set, this is an indication to the drivers that reset the underlying
+ * device before going ahead with the initialization otherwise driver might
+ * rely on the BIOS and skip the reset operation.
+ *
+ * This is useful if kernel is booting in an unreliable environment.
+ * For ex. kdump situaiton where previous kernel has crashed, BIOS has been
+ * skipped and devices will be in unknown state.
+ */
+unsigned int reset_devices;
+EXPORT_SYMBOL(reset_devices);
+
+/*
* Setup routine for controlling SMP activation
*
* Command-line option of "nosmp" or "maxcpus=0" will disable SMP
@@ -153,6 +165,14 @@ static int __init maxcpus(char *str)
__setup("maxcpus=", maxcpus);
+static int __init set_reset_devices(char *str)
+{
+ reset_devices = 1;
+ return 1;
+}
+
+__setup("reset_devices", set_reset_devices);
+
static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
static const char *panic_later, *panic_param;
_
Patches currently in -mm which might be from vgoyal@xxxxxxxxxx are
origin.patch
kcore-elf-note-namesz-field-fix.patch
stack-overflow-safe-kdump-safe_smp_processor_id.patch
stack-overflow-safe-kdump-safe_smp_processor_id_voyager.patch
stack-overflow-safe-kdump-crash_use_safe_smp_processor_id.patch
stack-overflow-safe-kdump-crash_use_safe_smp_processor_id-fix.patch
stack-overflow-safe-kdump-safe_smp_send_nmi_allbutself.patch
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