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    SubjectRe: [PATCH 3/5] tracing/events: add rcu locking around trace event prints
    Theodore Tso wrote:
    > I haven't been following all of the e-mail threads about the include
    > hell problem; what are the issues, exactly? What's the problem with
    > simply including <linux/rcuupdate.h>, and any needed prequisites in
    > ftrace.h?

    I'm adding tracing support to paravirt.h, which in turn gets included in
    various low-level arch/x86 headers. If it starts including other
    high-level linux/ headers, we quickly get into deep #include recursion
    problems and undefined symbols.


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