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

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Message-ID: <e590c4f6-ad6a-26a4-4f5f-9e6e63bfb15a@nvidia.com>
Date:   Thu, 22 Apr 2021 09:16:43 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Marco Elver <elver@...gle.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexander Potapenko <glider@...gle.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Christian Brauner <christian@...uner.io>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Jann Horn <jannh@...gle.com>, Jens Axboe <axboe@...nel.dk>,
        Matt Morehouse <mascasa@...gle.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Ian Rogers <irogers@...gle.com>,
        Oleg Nesterov <oleg@...hat.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v4 05/10] signal: Introduce TRAP_PERF si_code and si_perf
 to siginfo


On 22/04/2021 07:47, Marco Elver wrote:
> On Thu, 22 Apr 2021 at 08:12, Marek Szyprowski <m.szyprowski@...sung.com> wrote:
> [...]
>>> So I think we just have to settle on 'unsigned long' here. On many
>>> architectures, like 32-bit Arm, the alignment of a structure is that of
>>> its largest member. This means that there is no portable way to add
>>> 64-bit integers to siginfo_t on 32-bit architectures.
>>>
>>> In the case of the si_perf field, word size is sufficient since the data
>>> it contains is user-defined. On 32-bit architectures, any excess bits of
>>> perf_event_attr::sig_data will therefore be truncated when copying into
>>> si_perf.
>>>
>>> Feel free to test the below if you have time, but the below lets me boot
>>> 32-bit arm which previously timed out. It also passes all the
>>> static_asserts() I added (will send those as separate patches).
>>>
>>> Once I'm convinced this passes all others tests too, I'll send a patch.
>>
>> This fixes the issue I've observed on my test systems. Feel free to add:
>>
>> Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
>>
>> Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
> 
> Thank you for testing! It's been sent:
> https://lkml.kernel.org/r/20210422064437.3577327-1-elver@google.com


Thanks! This fixes the problem for Tegra as well. I have responded to
the above patch with my tested-by.

Cheers
Jon

-- 
nvpublic