Messages in this thread | | | Date | Fri, 21 Dec 2007 11:17:10 +0100 | From | Pavel Machek <> | Subject | Re: [PATCH 2/3 -mm] kexec jump -v8 : add write support to oldmem device |
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Hi!
> This patch adds writing support for /dev/oldmem. This can be used to > > - Communicate between original kernel and kexeced kernel through write > to some pages in original kernel. > > - Restore the memory contents of hibernated system in kexec based > hibernation. > > Signed-off-by: Huang Ying <ying.huang@intel.com> > > --- a/arch/x86/kernel/crash_dump_32.c > +++ b/arch/x86/kernel/crash_dump_32.c > +ssize_t write_oldmem_page(unsigned long pfn, const char *buf, > + size_t csize, unsigned long offset, int > userbuf)
> --- a/drivers/char/mem.c > +++ b/drivers/char/mem.c > @@ -348,6 +348,37 @@ static ssize_t read_oldmem(struct file * > } > return read; > } > + > +/* > + * Write memory corresponding to the old kernel. > + */ > +static ssize_t write_oldmem(struct file *file, const char __user *buf, > + size_t count, loff_t *ppos) > +{ ... > + rc = write_oldmem_page(pfn, buf, csize, offset, 1);
I believe this is going to break compilation on non-32bit machines. Or is crashdump only supported on i386? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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