[PATCH 03/11] tty/sysrq: constify the the sysrq_key_op(s)

From: Emil Velikov
Date: Wed May 13 2020 - 17:47:12 EST

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All the users threat them as immutable - annotate them as such.

Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Jiri Slaby <jslaby@xxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Emil Velikov <emil.l.velikov@xxxxxxxxx>
---
Please keep me in the CC list, as I'm not subscribed to the list.

IMHO it would be better if this gets merged this via the tty tree.
---
drivers/tty/sysrq.c | 52 +++++++++++++++++++++----------------------
include/linux/sysrq.h | 2 +-
2 files changed, 27 insertions(+), 27 deletions(-)

diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index 091c64a3cef0..477cdc1e9cf3 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -106,7 +106,7 @@ static void sysrq_handle_loglevel(int key)
pr_info("Loglevel set to %d\n", i);
console_loglevel = i;
}
-static struct sysrq_key_op sysrq_loglevel_op = {
+static const struct sysrq_key_op sysrq_loglevel_op = {
.handler = sysrq_handle_loglevel,
.help_msg = "loglevel(0-9)",
.action_msg = "Changing Loglevel",
@@ -119,14 +119,14 @@ static void sysrq_handle_SAK(int key)
struct work_struct *SAK_work = &vc_cons[fg_console].SAK_work;
schedule_work(SAK_work);
}
-static struct sysrq_key_op sysrq_SAK_op = {
+static const struct sysrq_key_op sysrq_SAK_op = {
.handler = sysrq_handle_SAK,
.help_msg = "sak(k)",
.action_msg = "SAK",
.enable_mask = SYSRQ_ENABLE_KEYBOARD,
};
#else
-#define sysrq_SAK_op (*(struct sysrq_key_op *)NULL)
+#define sysrq_SAK_op (*(const struct sysrq_key_op *)NULL)
#endif

#ifdef CONFIG_VT
@@ -135,14 +135,14 @@ static void sysrq_handle_unraw(int key)
vt_reset_unicode(fg_console);
}

-static struct sysrq_key_op sysrq_unraw_op = {
+static const struct sysrq_key_op sysrq_unraw_op = {
.handler = sysrq_handle_unraw,
.help_msg = "unraw(r)",
.action_msg = "Keyboard mode set to system default",
.enable_mask = SYSRQ_ENABLE_KEYBOARD,
};
#else
-#define sysrq_unraw_op (*(struct sysrq_key_op *)NULL)
+#define sysrq_unraw_op (*(const struct sysrq_key_op *)NULL)
#endif /* CONFIG_VT */

static void sysrq_handle_crash(int key)
@@ -152,7 +152,7 @@ static void sysrq_handle_crash(int key)

panic("sysrq triggered crash\n");
}
-static struct sysrq_key_op sysrq_crash_op = {
+static const struct sysrq_key_op sysrq_crash_op = {
.handler = sysrq_handle_crash,
.help_msg = "crash(c)",
.action_msg = "Trigger a crash",
@@ -165,20 +165,20 @@ static void sysrq_handle_reboot(int key)
local_irq_enable();
emergency_restart();
}
-static struct sysrq_key_op sysrq_reboot_op = {
+static const struct sysrq_key_op sysrq_reboot_op = {
.handler = sysrq_handle_reboot,
.help_msg = "reboot(b)",
.action_msg = "Resetting",
.enable_mask = SYSRQ_ENABLE_BOOT,
};

-struct sysrq_key_op *__sysrq_reboot_op = &sysrq_reboot_op;
+const struct sysrq_key_op *__sysrq_reboot_op = &sysrq_reboot_op;

static void sysrq_handle_sync(int key)
{
emergency_sync();
}
-static struct sysrq_key_op sysrq_sync_op = {
+static const struct sysrq_key_op sysrq_sync_op = {
.handler = sysrq_handle_sync,
.help_msg = "sync(s)",
.action_msg = "Emergency Sync",
@@ -190,7 +190,7 @@ static void sysrq_handle_show_timers(int key)
sysrq_timer_list_show();
}

-static struct sysrq_key_op sysrq_show_timers_op = {
+static const struct sysrq_key_op sysrq_show_timers_op = {
.handler = sysrq_handle_show_timers,
.help_msg = "show-all-timers(q)",
.action_msg = "Show clockevent devices & pending hrtimers (no others)",
@@ -200,7 +200,7 @@ static void sysrq_handle_mountro(int key)
{
emergency_remount();
}
-static struct sysrq_key_op sysrq_mountro_op = {
+static const struct sysrq_key_op sysrq_mountro_op = {
.handler = sysrq_handle_mountro,
.help_msg = "unmount(u)",
.action_msg = "Emergency Remount R/O",
@@ -213,13 +213,13 @@ static void sysrq_handle_showlocks(int key)
debug_show_all_locks();
}

-static struct sysrq_key_op sysrq_showlocks_op = {
+static const struct sysrq_key_op sysrq_showlocks_op = {
.handler = sysrq_handle_showlocks,
.help_msg = "show-all-locks(d)",
.action_msg = "Show Locks Held",
};
#else
-#define sysrq_showlocks_op (*(struct sysrq_key_op *)NULL)
+#define sysrq_showlocks_op (*(const struct sysrq_key_op *)NULL)
#endif

#ifdef CONFIG_SMP
@@ -266,7 +266,7 @@ static void sysrq_handle_showallcpus(int key)
}
}

-static struct sysrq_key_op sysrq_showallcpus_op = {
+static const struct sysrq_key_op sysrq_showallcpus_op = {
.handler = sysrq_handle_showallcpus,
.help_msg = "show-backtrace-all-active-cpus(l)",
.action_msg = "Show backtrace of all active CPUs",
@@ -284,7 +284,7 @@ static void sysrq_handle_showregs(int key)
show_regs(regs);
perf_event_print_debug();
}
-static struct sysrq_key_op sysrq_showregs_op = {
+static const struct sysrq_key_op sysrq_showregs_op = {
.handler = sysrq_handle_showregs,
.help_msg = "show-registers(p)",
.action_msg = "Show Regs",
@@ -296,7 +296,7 @@ static void sysrq_handle_showstate(int key)
show_state();
show_workqueue_state();
}
-static struct sysrq_key_op sysrq_showstate_op = {
+static const struct sysrq_key_op sysrq_showstate_op = {
.handler = sysrq_handle_showstate,
.help_msg = "show-task-states(t)",
.action_msg = "Show State",
@@ -307,7 +307,7 @@ static void sysrq_handle_showstate_blocked(int key)
{
show_state_filter(TASK_UNINTERRUPTIBLE);
}
-static struct sysrq_key_op sysrq_showstate_blocked_op = {
+static const struct sysrq_key_op sysrq_showstate_blocked_op = {
.handler = sysrq_handle_showstate_blocked,
.help_msg = "show-blocked-tasks(w)",
.action_msg = "Show Blocked State",
@@ -321,21 +321,21 @@ static void sysrq_ftrace_dump(int key)
{
ftrace_dump(DUMP_ALL);
}
-static struct sysrq_key_op sysrq_ftrace_dump_op = {
+static const struct sysrq_key_op sysrq_ftrace_dump_op = {
.handler = sysrq_ftrace_dump,
.help_msg = "dump-ftrace-buffer(z)",
.action_msg = "Dump ftrace buffer",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
#else
-#define sysrq_ftrace_dump_op (*(struct sysrq_key_op *)NULL)
+#define sysrq_ftrace_dump_op (*(const struct sysrq_key_op *)NULL)
#endif

static void sysrq_handle_showmem(int key)
{
show_mem(0, NULL);
}
-static struct sysrq_key_op sysrq_showmem_op = {
+static const struct sysrq_key_op sysrq_showmem_op = {
.handler = sysrq_handle_showmem,
.help_msg = "show-memory-usage(m)",
.action_msg = "Show Memory",
@@ -366,7 +366,7 @@ static void sysrq_handle_term(int key)
send_sig_all(SIGTERM);
console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
}
-static struct sysrq_key_op sysrq_term_op = {
+static const struct sysrq_key_op sysrq_term_op = {
.handler = sysrq_handle_term,
.help_msg = "terminate-all-tasks(e)",
.action_msg = "Terminate All Tasks",
@@ -396,7 +396,7 @@ static void sysrq_handle_moom(int key)
{
schedule_work(&moom_work);
}
-static struct sysrq_key_op sysrq_moom_op = {
+static const struct sysrq_key_op sysrq_moom_op = {
.handler = sysrq_handle_moom,
.help_msg = "memory-full-oom-kill(f)",
.action_msg = "Manual OOM execution",
@@ -408,7 +408,7 @@ static void sysrq_handle_thaw(int key)
{
emergency_thaw_all();
}
-static struct sysrq_key_op sysrq_thaw_op = {
+static const struct sysrq_key_op sysrq_thaw_op = {
.handler = sysrq_handle_thaw,
.help_msg = "thaw-filesystems(j)",
.action_msg = "Emergency Thaw of all frozen filesystems",
@@ -421,7 +421,7 @@ static void sysrq_handle_kill(int key)
send_sig_all(SIGKILL);
console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
}
-static struct sysrq_key_op sysrq_kill_op = {
+static const struct sysrq_key_op sysrq_kill_op = {
.handler = sysrq_handle_kill,
.help_msg = "kill-all-tasks(i)",
.action_msg = "Kill All Tasks",
@@ -432,7 +432,7 @@ static void sysrq_handle_unrt(int key)
{
normalize_rt_tasks();
}
-static struct sysrq_key_op sysrq_unrt_op = {
+static const struct sysrq_key_op sysrq_unrt_op = {
.handler = sysrq_handle_unrt,
.help_msg = "nice-all-RT-tasks(n)",
.action_msg = "Nice All RT Tasks",
@@ -442,7 +442,7 @@ static struct sysrq_key_op sysrq_unrt_op = {
/* Key Operations table and lock */
static DEFINE_SPINLOCK(sysrq_key_table_lock);

-static struct sysrq_key_op *sysrq_key_table[36] = {
+static const struct sysrq_key_op *sysrq_key_table[36] = {
&sysrq_loglevel_op, /* 0 */
&sysrq_loglevel_op, /* 1 */
&sysrq_loglevel_op, /* 2 */
diff --git a/include/linux/sysrq.h b/include/linux/sysrq.h
index 479028391c08..3a582ec7a2f1 100644
--- a/include/linux/sysrq.h
+++ b/include/linux/sysrq.h
@@ -47,7 +47,7 @@ void handle_sysrq(int key);
void __handle_sysrq(int key, bool check_mask);
int register_sysrq_key(int key, const struct sysrq_key_op *op);
int unregister_sysrq_key(int key, const struct sysrq_key_op *op);
-extern struct sysrq_key_op *__sysrq_reboot_op;
+extern const struct sysrq_key_op *__sysrq_reboot_op;

int sysrq_toggle_support(int enable_mask);
int sysrq_mask(void);
--
2.25.1

Next message: Pavel Machek: "Re: [PATCH 4.19 37/48] x86/entry/64: Fix unwind hints in register clearing code"
Previous message: Emil Velikov: "[PATCH 07/11] sparc64: constify sysrq_key_op"
In reply to: David Miller: "Re: [PATCH 07/11] sparc64: constify sysrq_key_op"
Next in thread: Greg Kroah-Hartman: "Re: [PATCH 01/11] tty/sysrq: alpha: export and use __sysrq_get_key_op()"
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