Messages in this thread | | | Date | Tue, 31 Jul 2007 11:51:01 +0200 | From | Pavel Machek <> | Subject | Re: [PATH 1/1] Kexec jump - v2 - kexec jump |
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Hi!
> This patch implement the functionality of jumping from kexeced kernel > to original kernel. > > A new reboot command named LINUX_REBOOT_CMD_KJUMP is defined to > trigger the jumping to (executing) the new kernel or jumping back to > the original kernel.
Could we get two reboot commands? Exec loaded kernel seems to be quite different operation than "jump back".
How do I test these patches? kexec -p <bzImage>, then kexec -j?
> +static unsigned long kexec_backup_addr = ~0UL; > + > +/* kexec_backup= specifies the location of backuped 0~640k memory of > + * crashed kernel. > + */ > +static int __init parse_kexec_backup(char *arg) > +{ > + if (!arg) > + return -EINVAL; > + > + kexec_backup_addr = memparse(arg, &arg); > + return 0; > +} > +early_param("kexec_backup", parse_kexec_backup);
New kernel parameters should be documented. (Plus I do not know how to use this one, please help :-).
> +int kexec_flags; > + > +static unsigned long kexec_jump_buf_pfn; > + > +static int __init parse_kexec_jump_buf_pfn(char *arg) > +{ > + if (!arg) > + return -EINVAL; > + > + kexec_jump_buf_pfn = memparse(arg, &arg); > + kexec_flags |= KEXEC_FLAGS_IS_KEXECED_KERNEL; > + return 0; > +} > +early_param("kexec_jump_buf_pfn", parse_kexec_jump_buf_pfn);
This one should be documented, too, I'd guess. (Is that internal, kernel-to-kernel communication?)
Pavel
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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