RFR: 8314114: Fix -Wconversion warnings in os code, primarily linux [v2]

[David Holmes]

On Mon, 14 Aug 2023 02:21:22 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> src/hotspot/os/linux/os_linux.cpp:745:48: warning: conversion from 'intx' {aka 'long int'} to 'OSThread::thread_id_t' {aka 'int'} may change value [-Wconversion]
>>   745 |   osthread->set_thread_id(os::current_thread_id());
>>       |                           ~~~~~~~~~~~~~~~~~~~~~^~
>
> I understand there is a conversion warning, but it seems wrong to `check_cast<int>` when the expected type is `thread_id_t` (which just happens to be an `int`).

I see this has been changed now - thanks.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15229#discussion_r1292923264