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Everywhere: Switch from (void) to [[maybe_unused]] (#4473)

Problem:
- `(void)` simply casts the expression to void. This is understood to
  indicate that it is ignored, but this is really a compiler trick to
  get the compiler to not generate a warning.

Solution:
- Use the `[[maybe_unused]]` attribute to indicate the value is unused.

Note:
- Functions taking a `(void)` argument list have also been changed to
  `()` because this is not needed and shows up in the same grep
  command.
This commit is contained in:
Lenny Maiorani 2020-12-20 16:09:48 -07:00 committed by GitHub
parent 4421d98e30
commit 765936ebae
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
103 changed files with 219 additions and 362 deletions

View file

@ -290,7 +290,7 @@ void BlockBasedFS::flush_specific_block_if_needed(unsigned index)
file_description().seek(base_offset, SEEK_SET);
// FIXME: Should this error path be surfaced somehow?
auto entry_data_buffer = UserOrKernelBuffer::for_kernel_buffer(entry.data);
(void)file_description().write(entry_data_buffer, block_size());
[[maybe_unused]] auto rc = file_description().write(entry_data_buffer, block_size());
cleaned_entries.append(&entry);
}
});
@ -311,7 +311,7 @@ void BlockBasedFS::flush_writes_impl()
file_description().seek(base_offset, SEEK_SET);
// FIXME: Should this error path be surfaced somehow?
auto entry_data_buffer = UserOrKernelBuffer::for_kernel_buffer(entry.data);
(void)file_description().write(entry_data_buffer, block_size());
[[maybe_unused]] auto rc = file_description().write(entry_data_buffer, block_size());
++count;
});
cache().mark_all_clean();

View file

@ -71,7 +71,7 @@ FileDescription::~FileDescription()
if (is_fifo())
static_cast<FIFO*>(m_file.ptr())->detach(m_fifo_direction);
// FIXME: Should this error path be observed somehow?
(void)m_file->close();
[[maybe_unused]] auto rc = m_file->close();
m_inode = nullptr;
}

View file

@ -710,7 +710,7 @@ Plan9FSInode::~Plan9FSInode()
Plan9FS::Message clunk_request { fs(), Plan9FS::Message::Type::Tclunk };
clunk_request << fid();
// FIXME: Should we observe this error somehow?
(void)fs().post_message_and_explicitly_ignore_reply(clunk_request);
[[maybe_unused]] auto rc = fs().post_message_and_explicitly_ignore_reply(clunk_request);
}
KResult Plan9FSInode::ensure_open_for_mode(int mode)
@ -909,7 +909,7 @@ KResult Plan9FSInode::traverse_as_directory(Function<bool(const FS::DirectoryEnt
Plan9FS::Message close_message { fs(), Plan9FS::Message::Type::Tclunk };
close_message << clone_fid;
// FIXME: Should we observe this error?
(void)fs().post_message_and_explicitly_ignore_reply(close_message);
[[maybe_unused]] auto rc = fs().post_message_and_explicitly_ignore_reply(close_message);
return result;
}
}
@ -942,7 +942,7 @@ KResult Plan9FSInode::traverse_as_directory(Function<bool(const FS::DirectoryEnt
Plan9FS::Message close_message { fs(), Plan9FS::Message::Type::Tclunk };
close_message << clone_fid;
// FIXME: Should we observe this error?
(void)fs().post_message_and_explicitly_ignore_reply(close_message);
[[maybe_unused]] auto rc = fs().post_message_and_explicitly_ignore_reply(close_message);
return result;
} else {
// TODO

View file

@ -1647,9 +1647,8 @@ KResult ProcFSInode::add_child(Inode&, const StringView&, mode_t)
return KResult(-EPERM);
}
KResult ProcFSInode::remove_child(const StringView& name)
KResult ProcFSInode::remove_child([[maybe_unused]] const StringView& name)
{
(void)name;
return KResult(-EPERM);
}