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exec: drop cpu_can_do_io, just read cpu->can_do_io

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After commit 626cf8f (icount: set can_do_io outside TB execution,
2014-12-08), can_do_io is set to 1 if not executing code.  It is
no longer necessary to make this assumption in cpu_can_do_io.

It is also possible to remove the use_icount test, simply by
never setting cpu->can_do_io to 0 unless use_icount is true.

With these changes cpu_can_do_io boils down to a read of
cpu->can_do_io.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-06-24 14:16:26 +02:00
parent b4a4b8d0e0
commit 414b15c909
7 changed files with 10 additions and 28 deletions
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21
include/exec/exec-all.h
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@ -346,27 +346,6 @@ extern int singlestep;
/* cpu-exec.c */
extern volatile sig_atomic_t exit_request;
/**
* cpu_can_do_io:
* @cpu: The CPU for which to check IO.
*
* Deterministic execution requires that IO only be performed on the last
* instruction of a TB so that interrupts take effect immediately.
*
* Returns: %true if memory-mapped IO is safe, %false otherwise.
*/
static inline bool cpu_can_do_io(CPUState *cpu)
{
if (!use_icount) {
return true;
}
/* If not executing code then assume we are ok. */
if (cpu->current_tb == NULL) {
return true;
}
return cpu->can_do_io != 0;
}
#if !defined(CONFIG_USER_ONLY)
void migration_bitmap_extend(ram_addr_t old, ram_addr_t new);
#endif