linux-kernel - [PATCH 0/2] PM: domains: use separate lockdep class for each genpd

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Message-Id: <20210611101540.3379937-1-dmitry.baryshkov@linaro.org>
Date:   Fri, 11 Jun 2021 13:15:38 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] PM: domains: use separate lockdep class for each genpd

It is not possible to always use mutex nesting when locking/unlocking
genpds. See for example the trace in the patch#2, where genpd calls are
broken with regulator calls (genpd enables regulator, regulator uses
another genpd). This causes lockdep to print a false warning and stop
reporting further warnings. Break this by introducing per-domain lock
classes and use them to clearly track genpd locking sequences.