[PATCH v2 6/7] um: remove IRQ_NONE type
Johannes Berg
johannes at sipsolutions.net
Wed Dec 2 06:59:55 EST 2020
From: Johannes Berg <johannes.berg at intel.com>
We don't actually use this in um_request_irq(), so it can
never be assigned. It's also not clear what that would be
useful for, so just remove it.
This results in quite a number of cleanups, all the way to
removing the "SIGIO on close" startup check, since the data
it assigns (pty_close_sigio) is not used anymore.
While at it, also make this an enum so we get a minimum of
type checking, and remove the IRQ_NONE hack in virtio since
we now no longer have the name twice.
Acked-By: Anton Ivanov <anton.ivanov at cambridgegreys.com>
Signed-off-by: Johannes Berg <johannes.berg at intel.com>
---
arch/um/drivers/random.c | 2 +-
arch/um/drivers/virtio_uml.c | 5 -----
arch/um/include/shared/irq_kern.h | 7 ++++---
arch/um/include/shared/irq_user.h | 9 +++++----
arch/um/include/shared/os.h | 6 +++---
arch/um/kernel/irq.c | 15 +++++++--------
arch/um/os-Linux/irq.c | 2 +-
arch/um/os-Linux/sigio.c | 25 +++++--------------------
8 files changed, 26 insertions(+), 45 deletions(-)
diff --git a/arch/um/drivers/random.c b/arch/um/drivers/random.c
index 385cb08d7ec2..efbf88ec48ac 100644
--- a/arch/um/drivers/random.c
+++ b/arch/um/drivers/random.c
@@ -132,7 +132,7 @@ static int __init rng_init (void)
if (err < 0)
goto err_out_cleanup_hw;
- sigio_broken(random_fd, 1);
+ sigio_broken(random_fd);
err = misc_register (&rng_miscdev);
if (err) {
diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c
index 94b112749d5b..27e92d3881ff 100644
--- a/arch/um/drivers/virtio_uml.c
+++ b/arch/um/drivers/virtio_uml.c
@@ -33,11 +33,6 @@
#include <os.h>
#include "vhost_user.h"
-/* Workaround due to a conflict between irq_user.h and irqreturn.h */
-#ifdef IRQ_NONE
-#undef IRQ_NONE
-#endif
-
#define MAX_SUPPORTED_QUEUE_SIZE 256
#define to_virtio_uml_device(_vdev) \
diff --git a/arch/um/include/shared/irq_kern.h b/arch/um/include/shared/irq_kern.h
index 7c04a0fd3a27..7807de593bda 100644
--- a/arch/um/include/shared/irq_kern.h
+++ b/arch/um/include/shared/irq_kern.h
@@ -8,11 +8,12 @@
#include <linux/interrupt.h>
#include <asm/ptrace.h>
+#include "irq_user.h"
#define UM_IRQ_ALLOC -1
-int um_request_irq(int irq, int fd, int type, irq_handler_t handler,
- unsigned long irqflags, const char * devname,
- void *dev_id);
+int um_request_irq(int irq, int fd, enum um_irq_type type,
+ irq_handler_t handler, unsigned long irqflags,
+ const char *devname, void *dev_id);
void um_free_irq(int irq, void *dev_id);
#endif
diff --git a/arch/um/include/shared/irq_user.h b/arch/um/include/shared/irq_user.h
index 5e975a9e8354..07239e801a5b 100644
--- a/arch/um/include/shared/irq_user.h
+++ b/arch/um/include/shared/irq_user.h
@@ -9,10 +9,11 @@
#include <sysdep/ptrace.h>
#include <stdbool.h>
-#define IRQ_READ 0
-#define IRQ_WRITE 1
-#define IRQ_NONE 2
-#define NUM_IRQ_TYPES (IRQ_NONE + 1)
+enum um_irq_type {
+ IRQ_READ,
+ IRQ_WRITE,
+ NUM_IRQ_TYPES,
+};
struct siginfo;
extern void sigio_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index f467d28fc0b4..e2bb7e488d59 100644
--- a/arch/um/include/shared/os.h
+++ b/arch/um/include/shared/os.h
@@ -299,7 +299,7 @@ extern void reboot_skas(void);
extern int os_waiting_for_events_epoll(void);
extern void *os_epoll_get_data_pointer(int index);
extern int os_epoll_triggered(int index, int events);
-extern int os_event_mask(int irq_type);
+extern int os_event_mask(enum um_irq_type irq_type);
extern int os_setup_epoll(void);
extern int os_add_epoll_fd(int events, int fd, void *data);
extern int os_mod_epoll_fd(int events, int fd, void *data);
@@ -310,8 +310,8 @@ extern void os_close_epoll_fd(void);
/* sigio.c */
extern int add_sigio_fd(int fd);
extern int ignore_sigio_fd(int fd);
-extern void maybe_sigio_broken(int fd, int read);
-extern void sigio_broken(int fd, int read);
+extern void maybe_sigio_broken(int fd);
+extern void sigio_broken(int fd);
/* prctl.c */
extern int os_arch_prctl(int pid, int option, unsigned long *arg2);
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index 93eb742ecafe..9e8f776bb43a 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -32,7 +32,7 @@ extern void free_irqs(void);
struct irq_reg {
void *id;
- int type;
+ enum um_irq_type type;
int irq;
int events;
bool active;
@@ -96,7 +96,7 @@ void sigio_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
}
for (i = 0; i < n ; i++) {
- /* Epoll back reference is the entry with 3 irq_reg
+ /* Epoll back reference is the entry with 2 irq_reg
* leaves - one for each irq type.
*/
irq_entry = (struct irq_entry *)
@@ -139,7 +139,7 @@ static int assign_epoll_events_to_irq(struct irq_entry *irq_entry)
-static int activate_fd(int irq, int fd, int type, void *dev_id)
+static int activate_fd(int irq, int fd, enum um_irq_type type, void *dev_id)
{
struct irq_reg *new_fd;
struct irq_entry *irq_entry;
@@ -217,7 +217,7 @@ static int activate_fd(int irq, int fd, int type, void *dev_id)
/* Turn back IO on with the correct (new) IO event mask */
assign_epoll_events_to_irq(irq_entry);
spin_unlock_irqrestore(&irq_lock, flags);
- maybe_sigio_broken(fd, (type != IRQ_NONE));
+ maybe_sigio_broken(fd);
return 0;
out_unlock:
@@ -444,10 +444,9 @@ void um_free_irq(int irq, void *dev)
}
EXPORT_SYMBOL(um_free_irq);
-int um_request_irq(int irq, int fd, int type,
- irq_handler_t handler,
- unsigned long irqflags, const char * devname,
- void *dev_id)
+int um_request_irq(int irq, int fd, enum um_irq_type type,
+ irq_handler_t handler, unsigned long irqflags,
+ const char *devname, void *dev_id)
{
int err;
diff --git a/arch/um/os-Linux/irq.c b/arch/um/os-Linux/irq.c
index d508310ee5e1..aa90a05b3d78 100644
--- a/arch/um/os-Linux/irq.c
+++ b/arch/um/os-Linux/irq.c
@@ -45,7 +45,7 @@ int os_epoll_triggered(int index, int events)
* access to the right includes/defines for EPOLL constants.
*/
-int os_event_mask(int irq_type)
+int os_event_mask(enum um_irq_type irq_type)
{
if (irq_type == IRQ_READ)
return EPOLLIN | EPOLLPRI;
diff --git a/arch/um/os-Linux/sigio.c b/arch/um/os-Linux/sigio.c
index 75558080d0bf..233b2b2212f1 100644
--- a/arch/um/os-Linux/sigio.c
+++ b/arch/um/os-Linux/sigio.c
@@ -336,7 +336,7 @@ static void write_sigio_workaround(void)
close(l_write_sigio_fds[1]);
}
-void sigio_broken(int fd, int read)
+void sigio_broken(int fd)
{
int err;
@@ -352,7 +352,7 @@ void sigio_broken(int fd, int read)
all_sigio_fds.poll[all_sigio_fds.used++] =
((struct pollfd) { .fd = fd,
- .events = read ? POLLIN : POLLOUT,
+ .events = POLLIN,
.revents = 0 });
out:
sigio_unlock();
@@ -360,17 +360,16 @@ void sigio_broken(int fd, int read)
/* Changed during early boot */
static int pty_output_sigio;
-static int pty_close_sigio;
-void maybe_sigio_broken(int fd, int read)
+void maybe_sigio_broken(int fd)
{
if (!isatty(fd))
return;
- if ((read || pty_output_sigio) && (!read || pty_close_sigio))
+ if (pty_output_sigio)
return;
- sigio_broken(fd, read);
+ sigio_broken(fd);
}
static void sigio_cleanup(void)
@@ -514,19 +513,6 @@ static void tty_output(int master, int slave)
printk(UM_KERN_CONT "tty_output : read failed, err = %d\n", n);
}
-static void tty_close(int master, int slave)
-{
- printk(UM_KERN_INFO "Checking that host ptys support SIGIO on "
- "close...");
-
- close(slave);
- if (got_sigio) {
- printk(UM_KERN_CONT "Yes\n");
- pty_close_sigio = 1;
- } else
- printk(UM_KERN_CONT "No, enabling workaround\n");
-}
-
static void __init check_sigio(void)
{
if ((access("/dev/ptmx", R_OK) < 0) &&
@@ -536,7 +522,6 @@ static void __init check_sigio(void)
return;
}
check_one_sigio(tty_output);
- check_one_sigio(tty_close);
}
/* Here because it only does the SIGIO testing for now */
--
2.26.2
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