linux-kernel - Re: [PATCH v4 05/10] signal: Introduce TRAP_PERF si_code and si

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Message-ID: <81254854-aa22-fab1-fc6f-22716b7c2732@nvidia.com>
Date:   Wed, 21 Apr 2021 16:07:13 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Marco Elver <elver@...gle.com>, <peterz@...radead.org>,
        <alexander.shishkin@...ux.intel.com>, <acme@...nel.org>,
        <mingo@...hat.com>, <jolsa@...hat.com>, <mark.rutland@....com>,
        <namhyung@...nel.org>, <tglx@...utronix.de>
CC:     <glider@...gle.com>, <viro@...iv.linux.org.uk>, <arnd@...db.de>,
        <christian@...uner.io>, <dvyukov@...gle.com>, <jannh@...gle.com>,
        <axboe@...nel.dk>, <mascasa@...gle.com>, <pcc@...gle.com>,
        <irogers@...gle.com>, <oleg@...hat.com>,
        <kasan-dev@...glegroups.com>, <linux-arch@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <x86@...nel.org>, <linux-kselftest@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v4 05/10] signal: Introduce TRAP_PERF si_code and si_perf
 to siginfo

Hello!

On 08/04/2021 11:36, Marco Elver wrote:
> Introduces the TRAP_PERF si_code, and associated siginfo_t field
> si_perf. These will be used by the perf event subsystem to send signals
> (if requested) to the task where an event occurred.
> 
> Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org> # m68k
> Acked-by: Arnd Bergmann <arnd@...db.de> # asm-generic
> Signed-off-by: Marco Elver <elver@...gle.com>


Since next-20210420 I have noticed a boot regression on all 32-bit Tegra
that we are testing. Bisect is pointing to this commit and reverting
this patch and patch 6/10 does resolve the issue.

Interestingly there is no apparent crash, but these systems just appear
to hang silently after mounting the rootfs. If anyone has any thoughts
let me know!

Thanks
Jon

-- 
nvpublic