linux-kernel - [PATCH v2 0/7] Tracing vs CR2 (and cleanups)

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Message-Id: <20190704195555.580363209@infradead.org>
Date:   Thu, 04 Jul 2019 21:55:55 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     tglx@...utronix.de, bp@...en8.de, mingo@...nel.org,
        rostedt@...dmis.org, luto@...nel.org, torvalds@...ux-foundation.org
Cc:     hpa@...or.com, dave.hansen@...ux.intel.com, jgross@...e.com,
        linux-kernel@...r.kernel.org, zhe.he@...driver.com,
        joel@...lfernandes.org, devel@...ukata.com, peterz@...radead.org
Subject: [PATCH v2 0/7] Tracing vs CR2 (and cleanups)

Hi,

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:

  https://lkml.kernel.org/r/20190320221534.165ab87b@oasis.local.home

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.