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

[David Holmes]

On Thu, 10 Aug 2023 22:30:55 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> src/hotspot/os/linux/os_linux.cpp line 3204:
>> 
>>> 3202:       for (int j = 0; j < cpu_map_valid_size; j++) {
>>> 3203:         if (cpu_map[j] != 0) {
>>> 3204:           for (int k = 0; k < BitsPerCLong; k++) {
>> 
>> For changes to lines 3145 to 3204, wouldn't it be better to keep using size_t?
>
> I started that way and it required more casts.  This was the path of least cast-ness.

For some reason I have an aversion to seeing a `size_t` loop index variable. These changes to `int` are a pleasant surprise. :)

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PR Review Comment: https://git.openjdk.org/jdk/pull/15229#discussion_r1290853385