Messages in this thread Patch in this message | | | From | John Kacur <> | Subject | [PATCH 12/26] printk: Convert lock to raw_spinlock | Date | Mon, 11 Jan 2010 22:26:42 +0100 |
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Convert locks that cannot sleep in preempt-rt to raw_spinlocks.
See also: 0835f1f82a88e366d8dd20874c94133915dcccdb
Signed-off-by: John Kacur <jkacur@redhat.com> --- include/linux/ratelimit.h | 4 ++-- kernel/printk.c | 42 +++++++++++++++++++++--------------------- lib/ratelimit.c | 4 ++-- 3 files changed, 25 insertions(+), 25 deletions(-)
diff --git a/include/linux/ratelimit.h b/include/linux/ratelimit.h index 668cf1b..7596e38 100644 --- a/include/linux/ratelimit.h +++ b/include/linux/ratelimit.h @@ -8,7 +8,7 @@ #define DEFAULT_RATELIMIT_BURST 10 struct ratelimit_state { - spinlock_t lock; /* protect the state */ + raw_spinlock_t lock; /* protect the state */ int interval; int burst; @@ -20,7 +20,7 @@ struct ratelimit_state { #define DEFINE_RATELIMIT_STATE(name, interval_init, burst_init) \ \ struct ratelimit_state name = { \ - .lock = __SPIN_LOCK_UNLOCKED(name.lock), \ + .lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \ .interval = interval_init, \ .burst = burst_init, \ } diff --git a/kernel/printk.c b/kernel/printk.c index 17463ca..4ebb6e0 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -102,7 +102,7 @@ static int console_locked, console_suspended; * It is also used in interesting ways to provide interlocking in * release_console_sem(). */ -static DEFINE_SPINLOCK(logbuf_lock); +static DEFINE_RAW_SPINLOCK(logbuf_lock); #define LOG_BUF_MASK (log_buf_len-1) #define LOG_BUF(idx) (log_buf[(idx) & LOG_BUF_MASK]) @@ -181,7 +181,7 @@ static int __init log_buf_len_setup(char *str) goto out; } - spin_lock_irqsave(&logbuf_lock, flags); + raw_spin_lock_irqsave(&logbuf_lock, flags); log_buf_len = size; log_buf = new_log_buf; @@ -195,7 +195,7 @@ static int __init log_buf_len_setup(char *str) log_start -= offset; con_start -= offset; log_end -= offset; - spin_unlock_irqrestore(&logbuf_lock, flags); + raw_spin_unlock_irqrestore(&logbuf_lock, flags); printk(KERN_NOTICE "log_buf_len: %d\n", log_buf_len); } @@ -305,18 +305,18 @@ int do_syslog(int type, char __user *buf, int len) if (error) goto out; i = 0; - spin_lock_irq(&logbuf_lock); + raw_spin_lock_irq(&logbuf_lock); while (!error && (log_start != log_end) && i < len) { c = LOG_BUF(log_start); log_start++; - spin_unlock_irq(&logbuf_lock); + raw_spin_unlock_irq(&logbuf_lock); error = __put_user(c,buf); buf++; i++; cond_resched(); - spin_lock_irq(&logbuf_lock); + raw_spin_lock_irq(&logbuf_lock); } - spin_unlock_irq(&logbuf_lock); + raw_spin_unlock_irq(&logbuf_lock); if (!error) error = i; break; @@ -337,7 +337,7 @@ int do_syslog(int type, char __user *buf, int len) count = len; if (count > log_buf_len) count = log_buf_len; - spin_lock_irq(&logbuf_lock); + raw_spin_lock_irq(&logbuf_lock); if (count > logged_chars) count = logged_chars; if (do_clear) @@ -354,12 +354,12 @@ int do_syslog(int type, char __user *buf, int len) if (j + log_buf_len < log_end) break; c = LOG_BUF(j); - spin_unlock_irq(&logbuf_lock); + raw_spin_unlock_irq(&logbuf_lock); error = __put_user(c,&buf[count-1-i]); cond_resched(); - spin_lock_irq(&logbuf_lock); + raw_spin_lock_irq(&logbuf_lock); } - spin_unlock_irq(&logbuf_lock); + raw_spin_unlock_irq(&logbuf_lock); if (error) break; error = i; @@ -542,7 +542,7 @@ static void zap_locks(void) oops_timestamp = jiffies; /* If a crash is occurring, make sure we can't deadlock */ - spin_lock_init(&logbuf_lock); + raw_spin_lock_init(&logbuf_lock); /* And make sure that we print immediately */ init_MUTEX(&console_sem); } @@ -646,7 +646,7 @@ static int acquire_console_semaphore_for_printk(unsigned int cpu) } } printk_cpu = UINT_MAX; - spin_unlock(&logbuf_lock); + raw_spin_unlock(&logbuf_lock); return retval; } static const char recursion_bug_msg [] = @@ -704,7 +704,7 @@ asmlinkage int vprintk(const char *fmt, va_list args) } lockdep_off(); - spin_lock(&logbuf_lock); + raw_spin_lock(&logbuf_lock); printk_cpu = this_cpu; if (recursion_bug) { @@ -1053,14 +1053,14 @@ void release_console_sem(void) console_may_schedule = 0; for ( ; ; ) { - spin_lock_irqsave(&logbuf_lock, flags); + raw_spin_lock_irqsave(&logbuf_lock, flags); wake_klogd |= log_start - log_end; if (con_start == log_end) break; /* Nothing to print */ _con_start = con_start; _log_end = log_end; con_start = log_end; /* Flush */ - spin_unlock(&logbuf_lock); + raw_spin_unlock(&logbuf_lock); stop_critical_timings(); /* don't trace print latency */ call_console_drivers(_con_start, _log_end); start_critical_timings(); @@ -1068,7 +1068,7 @@ void release_console_sem(void) } console_locked = 0; up(&console_sem); - spin_unlock_irqrestore(&logbuf_lock, flags); + raw_spin_unlock_irqrestore(&logbuf_lock, flags); if (wake_klogd) wake_up_klogd(); } @@ -1286,9 +1286,9 @@ void register_console(struct console *newcon) * release_console_sem() will print out the buffered messages * for us. */ - spin_lock_irqsave(&logbuf_lock, flags); + raw_spin_lock_irqsave(&logbuf_lock, flags); con_start = log_start; - spin_unlock_irqrestore(&logbuf_lock, flags); + raw_spin_unlock_irqrestore(&logbuf_lock, flags); } release_console_sem(); @@ -1496,10 +1496,10 @@ void kmsg_dump(enum kmsg_dump_reason reason) /* Theoretically, the log could move on after we do this, but there's not a lot we can do about that. The new messages will overwrite the start of what we dump. */ - spin_lock_irqsave(&logbuf_lock, flags); + raw_spin_lock_irqsave(&logbuf_lock, flags); end = log_end & LOG_BUF_MASK; chars = logged_chars; - spin_unlock_irqrestore(&logbuf_lock, flags); + raw_spin_unlock_irqrestore(&logbuf_lock, flags); if (logged_chars > end) { s1 = log_buf + log_buf_len - logged_chars + end; diff --git a/lib/ratelimit.c b/lib/ratelimit.c index 09f5ce1..39588b3 100644 --- a/lib/ratelimit.c +++ b/lib/ratelimit.c @@ -34,7 +34,7 @@ int ___ratelimit(struct ratelimit_state *rs, const char *func) * in addition to the one that will be printed by * the entity that is holding the lock already: */ - if (!spin_trylock_irqsave(&rs->lock, flags)) + if (!raw_spin_trylock_irqsave(&rs->lock, flags)) return 1; if (!rs->begin) @@ -55,7 +55,7 @@ int ___ratelimit(struct ratelimit_state *rs, const char *func) rs->missed++; ret = 0; } - spin_unlock_irqrestore(&rs->lock, flags); + raw_spin_unlock_irqrestore(&rs->lock, flags); return ret; } -- 1.6.5.2
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