Messages in this thread | | | Date | Tue, 19 Feb 2019 10:44:38 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH] sched/x86: Save [ER]FLAGS on context switch |
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On Tue, Feb 19, 2019 at 10:04:09AM +0100, Peter Zijlstra wrote: > > Does that make more sense? > > It appears to me you're going about it backwards.
So how about you do a GCC plugin that verifies limits on code-gen between user_access_begin/user_access_end() ?
- No CALL/RET - implies user_access_end() happens - implies no fentry hooks - No __preempt_count frobbing - No tracepoints - ...
That way you put the burden on the special code, not on the rest of the kernel.
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