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Date:   Thu, 04 Jul 2019 21:55:55 +0200
From:   Peter Zijlstra <>
Subject: [PATCH v2 0/7] Tracing vs CR2 (and cleanups)


Eiichi-san re-discovered the bug earlier found by He Zhe which we've failed to
fix due to getting distracted by discussing how to untangle entry_64.S.

These 3 patches are basically a completion of the initial approach I suggested
in that earlier thread:

Since v1:

 - idtentry_part 'cleanup'
 - extra sanity check and comment
 - read_cr2=1 for do_double_fault
 - #BP vs IST cleanup
 - IDTENTRYx() C wrapper

The thing boots on x86_64 with lockdep on, survives function-trace,
selftests/x86 and perf-test.

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