> Add "int options" into struct ptrace_context. Will be used to hold
> PT_XXX options. Currently is not used, but:

IMHO the traditional PT_* bit assignments are useless.  
We should just store and use the PTRACE_O_* bits directly.

> - introduce __ptrace_set_options() helper which updates ->options
>   and utrace events mask.

Despite overly-common kernel practice, __foo is a lousy name for anything.
The only place where I think __foo makes sense for new code is when foo is
a wrapper that takes a lock around calling __foo.  I'd prefer if we can
just pick meaningful names for new internal functions.  __ names are
especially pointless for static functions.

> +static inline
> +struct ptrace_context *ptrace_context(struct utrace_engine *engine)
> +{
> +     return engine->data;
> +}

When the prototype doesn't fit on a line, the usual way to break it is:

        static inline struct ptrace_context *
        ptrace_context(struct utrace_engine *engine)

But anyway, what's the point of this helper?
What's wrong with or any less clear about plain:

        struct ptrace_context *ctx = engine->data;

?


Thanks,
Roland

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