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    SubjectRe: [RFC] [PATCH 2.6.37-rc5-tip 13/20] 13: x86: x86 specific probe handling
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    On Thu, 2010-12-16 at 15:29 +0530, Srikar Dronamraju wrote:
    >
    > +void arch_uprobe_enable_sstep(struct pt_regs *regs)
    > +{
    > + /*
    > + * Enable single-stepping by
    > + * - Set TF on stack
    > + * - Set TIF_SINGLESTEP: Guarantees that TF is set when
    > + * returning to user mode.
    > + * - Indicate that TF is set by us.
    > + */
    > + regs->flags |= X86_EFLAGS_TF;
    > + set_thread_flag(TIF_SINGLESTEP);
    > + set_thread_flag(TIF_FORCED_TF);
    > +}
    > +
    > +void arch_uprobe_disable_sstep(struct pt_regs *regs)
    > +{
    > + /* Disable single-stepping by clearing what we set */
    > + clear_thread_flag(TIF_SINGLESTEP);
    > + clear_thread_flag(TIF_FORCED_TF);
    > + regs->flags &= ~X86_EFLAGS_TF;
    > +}

    Why not use the code from arch/x86/kernel/step.c?


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