Messages in this thread | | | Date | Wed, 26 Nov 2008 08:18:02 +0530 | From | "Nikanth K" <> | Subject | Re: [RFC] kreplace: Rebootless kernel updates |
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Hi Masami
On Mon, Nov 24, 2008 at 8:45 PM, Masami Hiramatsu <mhiramat@redhat.com> wrote: > Nikanth Karthikesan wrote: >> On Friday 21 November 2008 20:09:52 Masami Hiramatsu wrote: >>> Hi Nikanth, >>> >>> Nikanth Karthikesan wrote: >> >>> Hmm, >>> Would you like to replace a function to another function? >>> If so, AFAIK, you can do that with kprobe and below pre_handler. >>> (see booster enabled path in setup_singlestep()) >>> >>> pre_handler(...) >>> { >>> reset_current_kprobe(); /* this kprobe doesn't need any more */ >>> regs->ip = new_function; /* change IP to new function */ >>> preempt_enable_no_resched(); /* recover preempt count */ >>> return 1; /* No need to setup singlestep */ >>> } >>> >>> >> >> So, am I seeing worries to enable something, which is already possible, but >> just not documented? > > Actually, you can do this with kprobes, but not documented, > because the regs->ip setup depends on arch. (above code is only for > x86/x86-64). > > I think it's easier to just provide above pre_handler for each arch than > jprobe-based kreplace approach. >
I thought jprobes would provide easy access to function parameters.
Thanks Nikanth
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