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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.

J


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