[v2,18.1/34] hurd: Do not declare local variables volatile
Commit Message
These are just regular local variables that are not accessed in any
funny ways, not even though a pointer. There's absolutely no reason to
declare them volatile. It only ends up hurting the quality of the
generated machine code.
If anything, it would make sense to decalre sigsp as *pointing* to
volatile memory (volatile void *sigsp), but evidently that's not needed
either.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
---
hurd/trampoline.c | 2 +-
sysdeps/mach/hurd/i386/trampoline.c | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
Comments
Applied, thanks!
Sergey Bugaev, le lun. 03 avril 2023 14:56:20 +0300, a ecrit:
> These are just regular local variables that are not accessed in any
> funny ways, not even though a pointer. There's absolutely no reason to
> declare them volatile. It only ends up hurting the quality of the
> generated machine code.
>
> If anything, it would make sense to decalre sigsp as *pointing* to
> volatile memory (volatile void *sigsp), but evidently that's not needed
> either.
>
> Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
> ---
> hurd/trampoline.c | 2 +-
> sysdeps/mach/hurd/i386/trampoline.c | 4 ++--
> 2 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/hurd/trampoline.c b/hurd/trampoline.c
> index 5bd8dec9..1447b13f 100644
> --- a/hurd/trampoline.c
> +++ b/hurd/trampoline.c
> @@ -29,7 +29,7 @@ struct sigcontext *
> _hurd_setup_sighandler (struct hurd_sigstate *ss, const struct sigaction *action,
> __sighandler_t handler,
> int signo, struct hurd_signal_detail *detail,
> - volatile int rpc_wait,
> + int rpc_wait,
> struct machine_thread_all_state *state)
> {
> #error "Need to write sysdeps/mach/hurd/MACHINE/trampoline.c"
> diff --git a/sysdeps/mach/hurd/i386/trampoline.c b/sysdeps/mach/hurd/i386/trampoline.c
> index ab67fb9c..9cd60b9c 100644
> --- a/sysdeps/mach/hurd/i386/trampoline.c
> +++ b/sysdeps/mach/hurd/i386/trampoline.c
> @@ -83,13 +83,13 @@ struct sigcontext *
> _hurd_setup_sighandler (struct hurd_sigstate *ss, const struct sigaction *action,
> __sighandler_t handler,
> int signo, struct hurd_signal_detail *detail,
> - volatile int rpc_wait,
> + int rpc_wait,
> struct machine_thread_all_state *state)
> {
> void trampoline (void);
> void rpc_wait_trampoline (void);
> void firewall (void);
> - void *volatile sigsp;
> + void *sigsp;
> struct sigcontext *scp;
> struct
> {
> --
> 2.39.2
>
@@ -29,7 +29,7 @@ struct sigcontext *
_hurd_setup_sighandler (struct hurd_sigstate *ss, const struct sigaction *action,
__sighandler_t handler,
int signo, struct hurd_signal_detail *detail,
- volatile int rpc_wait,
+ int rpc_wait,
struct machine_thread_all_state *state)
{
#error "Need to write sysdeps/mach/hurd/MACHINE/trampoline.c"
@@ -83,13 +83,13 @@ struct sigcontext *
_hurd_setup_sighandler (struct hurd_sigstate *ss, const struct sigaction *action,
__sighandler_t handler,
int signo, struct hurd_signal_detail *detail,
- volatile int rpc_wait,
+ int rpc_wait,
struct machine_thread_all_state *state)
{
void trampoline (void);
void rpc_wait_trampoline (void);
void firewall (void);
- void *volatile sigsp;
+ void *sigsp;
struct sigcontext *scp;
struct
{