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    SubjectRe: [PATCH] Kwatch: kernel watchpoints using CPU debug registers
    On Wed, Feb 21, 2007 at 03:35:13PM -0500, Alan Stern wrote:
    > Going back to something you mentioned earlier...
    > On Fri, 9 Feb 2007, Roland McGrath wrote:
    > There are two things I am uncertain about: vm86 mode and kprobes. I don't
    > know anything about how either of them works. Judging from the current
    > code, nothing much should be needed -- debug traps in vm86 mode are
    > handled by calling handle_vm86_trap(), and kprobes puts itself at the
    > start of the notify_die() chain so it can handle single-step traps.
    > Eventually it will be necessary to check with someone who really
    > understands the issues.

    Yes, Kprobes needs to get notified first to handle single-step traps. So kwatch
    getting notified secound should be fine.

    Prasanna S.P.
    Linux Technology Center
    India Software Labs, IBM Bangalore
    Ph: 91-80-41776329
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