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panic/reboot: allow specifying reboot_mode for panic only

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Allow specifying reboot_mode for panic only.  This is needed on systems
where ramoops is used to store panic logs, and user wants to use warm
reset to preserve those, while still having cold reset on normal
reboots.

Link: http://lkml.kernel.org/r/20190322004735.27702-1-aaro.koskinen@iki.fi
Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Aaro Koskinen
2019-05-14 15:45:37 -07:00
committed by Linus Torvalds
parent c39ea0b9dd
commit b287a25a71
4 changed files with 22 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
kernel/reboot.c
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@@ -31,6 +31,7 @@ EXPORT_SYMBOL(cad_pid);
#define DEFAULT_REBOOT_MODE
#endif
enum reboot_mode reboot_mode DEFAULT_REBOOT_MODE;
enum reboot_mode panic_reboot_mode = REBOOT_UNDEFINED;
/*
* This variable is used privately to keep track of whether or not
@@ -519,6 +520,8 @@ EXPORT_SYMBOL_GPL(orderly_reboot);
static int __init reboot_setup(char *str)
{
for (;;) {
enum reboot_mode *mode;
/*
* Having anything passed on the command line via
* reboot= will cause us to disable DMI checking
@@ -526,17 +529,24 @@ static int __init reboot_setup(char *str)
*/
reboot_default = 0;
if (!strncmp(str, "panic_", 6)) {
mode = &panic_reboot_mode;
str += 6;
} else {
mode = &reboot_mode;
}
switch (*str) {
case 'w':
reboot_mode = REBOOT_WARM;
*mode = REBOOT_WARM;
break;
case 'c':
reboot_mode = REBOOT_COLD;
*mode = REBOOT_COLD;
break;
case 'h':
reboot_mode = REBOOT_HARD;
*mode = REBOOT_HARD;
break;
case 's':
@@ -553,11 +563,11 @@ static int __init reboot_setup(char *str)
if (rc)
return rc;
} else
reboot_mode = REBOOT_SOFT;
*mode = REBOOT_SOFT;
break;
}
case 'g':
reboot_mode = REBOOT_GPIO;
*mode = REBOOT_GPIO;
break;
case 'b':