advise_writes_unsafely_to_part_of_map test fails on powerpc64le-unknown-linux-gnu

[decathorpe]

I'm the maintainer of the package for this crate in Fedora Linux, and with the update to version 0.9.0, I noticed a new test failure on powerpc64le compared to v0.7.1:

---- test::advise_writes_unsafely_to_part_of_map stdout ----
thread 'test::advise_writes_unsafely_to_part_of_map' panicked at 'assertion failed: `(left == right)`
  left: `0`,
 right: `255`', src/lib.rs:1978:9

The error message points to this assertion:
https://github.com/RazrFalcon/memmap2-rs/blob/v0.9.0/src/lib.rs#L1978

I don't know how or why powerpc64le is different here exactly ... the only thing I can think of right now is that the default page size is 64KB on powerpc64le, while it's 4KB on most other architectures.

All tests pass on our other supported architectures ({x86_64,i686,aarch64,s390x}-unknown-linux-gnu).

---

Test environment:

• Fedora Linux 40, 39, 38 / Red Hat Enterprise Linux 9
• Rust 1.74 (Fedora) , Rust 1.71 (RHEL)
• powerpc64le-unknown-linux-gnu (page size: 64K)

[adamreichold]

Yeah, that test assumes 4 kB page size. Will create a fix.

[decathorpe]

Awesome, thank you for the quick fix!