On Thu, Oct 19, 2017 at 02:29:20AM -0700, Nicolin Chen wrote: > On Fri, Sep 15, 2017 at 12:10:13PM -0700, Nicolin Chen wrote: > > Below is the call trace of tegra210_init_pllu() function: > > start_kernel() > > -> time_init() > > --> of_clk_init() > > ---> tegra210_clock_init() > > ----> tegra210_pll_init() > > -----> tegra210_init_pllu() > > > > Because the preemption is disabled in the start_kernel before calling > > time_init, tegra210_init_pllu is actually in an atomic context while > > it includes a readl_relaxed_poll_timeout that might sleep. > > > > So this patch just changes this readl_relaxed_poll_timeout() to its > > atomic version. > > > > Signed-off-by: Nicolin Chen <[email protected]> > > Acked-By: Peter De Schrijver <[email protected]> > > Thierry, can you also take a look at this one? I sent a month ago. Thanks.
I'm wondering why we're not seeing a splat for this. Usually the kernel will warn if you sleep during atomic context. Does this mean we're just not hitting that case? readx_poll_timeout() has a might_sleep_if(), and therefore it should always cause the splat. Any ideas why this has gone unnoticed for all this time? Thierry
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