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

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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
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GPG key ID: 4AEE18F83AFDEB23
103 changed files with 219 additions and 362 deletions
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21
Kernel/Arch/i386/CPU.cpp
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@ -64,9 +64,9 @@ static GenericInterruptHandler* s_interrupt_handler[GENERIC_INTERRUPT_HANDLERS_C
extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread);
extern "C" void context_first_init(Thread* from_thread, Thread* to_thread, TrapFrame* trap);
extern "C" u32 do_init_context(Thread* thread, u32 flags);
extern "C" void exit_kernel_thread(void);
extern "C" void pre_init_finished(void);
extern "C" void post_init_finished(void);
extern "C" void exit_kernel_thread();
extern "C" void pre_init_finished();
extern "C" void post_init_finished();
extern "C" void handle_interrupt(TrapFrame*);
#define EH_ENTRY(ec, title) \
@ -1490,13 +1490,10 @@ void Processor::switch_context(Thread*& from_thread, Thread*& to_thread)
#endif
}
extern "C" void context_first_init(Thread* from_thread, Thread* to_thread, TrapFrame* trap)
extern "C" void context_first_init([[maybe_unused]] Thread* from_thread, [[maybe_unused]] Thread* to_thread, [[maybe_unused]] TrapFrame* trap)
{
ASSERT(!are_interrupts_enabled());
ASSERT(is_kernel_mode());
(void)from_thread;
(void)to_thread;
(void)trap;
#ifdef CONTEXT_SWITCH_DEBUG
dbg() << "switch_context <-- from " << VirtualAddress(from_thread) << " " << *from_thread << " to " << VirtualAddress(to_thread) << " " << *to_thread << " (context_first_init)";
@ -1513,7 +1510,7 @@ extern "C" void context_first_init(Thread* from_thread, Thread* to_thread, TrapF
Scheduler::leave_on_first_switch(trap->regs->eflags);
}
extern "C" void thread_context_first_enter(void);
extern "C" void thread_context_first_enter();
asm(
// enter_thread_context returns to here first time a thread is executing
".globl thread_context_first_enter \n"
@ -1529,7 +1526,7 @@ asm(
" jmp common_trap_exit \n"
);
void exit_kernel_thread(void)
void exit_kernel_thread()
{
Thread::current()->exit();
}
@ -1674,7 +1671,7 @@ void Processor::assume_context(Thread& thread, u32 flags)
ASSERT_NOT_REACHED();
}
extern "C" void pre_init_finished(void)
extern "C" void pre_init_finished()
{
ASSERT(g_scheduler_lock.own_lock());
@ -1687,7 +1684,7 @@ extern "C" void pre_init_finished(void)
Scheduler::leave_on_first_switch(prev_flags);
}
extern "C" void post_init_finished(void)
extern "C" void post_init_finished()
{
// We need to re-acquire the scheduler lock before a context switch
// transfers control into the idle loop, which needs the lock held
@ -1731,7 +1728,7 @@ void Processor::initialize_context_switching(Thread& initial_thread)
[from_to_thread] "b" (&initial_thread),
[cpu] "c" (id())
);
ASSERT_NOT_REACHED();
}