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Diffstat (limited to 'arch/alpha/kernel/smp.c')
-rw-r--r--arch/alpha/kernel/smp.c508
1 files changed, 65 insertions, 443 deletions
diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c
index e211aa7404e..99ac36d5de4 100644
--- a/arch/alpha/kernel/smp.c
+++ b/arch/alpha/kernel/smp.c
@@ -16,9 +16,9 @@
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/mm.h>
+#include <linux/err.h>
#include <linux/threads.h>
#include <linux/smp.h>
-#include <linux/smp_lock.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
@@ -27,10 +27,11 @@
#include <linux/cache.h>
#include <linux/profile.h>
#include <linux/bitops.h>
+#include <linux/cpu.h>
#include <asm/hwrpb.h>
#include <asm/ptrace.h>
-#include <asm/atomic.h>
+#include <linux/atomic.h>
#include <asm/io.h>
#include <asm/irq.h>
@@ -52,6 +53,7 @@
/* A collection of per-processor data. */
struct cpuinfo_alpha cpu_data[NR_CPUS];
+EXPORT_SYMBOL(cpu_data);
/* A collection of single bit ipi messages. */
static struct {
@@ -61,27 +63,16 @@ static struct {
enum ipi_message_type {
IPI_RESCHEDULE,
IPI_CALL_FUNC,
+ IPI_CALL_FUNC_SINGLE,
IPI_CPU_STOP,
};
/* Set to a secondary's cpuid when it comes online. */
-static int smp_secondary_alive __initdata = 0;
-
-/* Which cpus ids came online. */
-cpumask_t cpu_present_mask;
-cpumask_t cpu_online_map;
-
-EXPORT_SYMBOL(cpu_online_map);
-
-/* cpus reported in the hwrpb */
-static unsigned long hwrpb_cpu_present_mask __initdata = 0;
+static int smp_secondary_alive = 0;
int smp_num_probed; /* Internal processor count */
int smp_num_cpus = 1; /* Number that came online. */
-
-extern void calibrate_delay(void);
-
-
+EXPORT_SYMBOL(smp_num_cpus);
/*
* Called by both boot and secondaries to move global data into
@@ -125,15 +116,16 @@ wait_boot_cpu_to_stop(int cpuid)
/*
* Where secondaries begin a life of C.
*/
-void __init
+void
smp_callin(void)
{
int cpuid = hard_smp_processor_id();
- if (cpu_test_and_set(cpuid, cpu_online_map)) {
+ if (cpu_online(cpuid)) {
printk("??, cpu 0x%x already present??\n", cpuid);
BUG();
}
+ set_cpu_online(cpuid, true);
/* Turn on machine checks. */
wrmces(7);
@@ -146,14 +138,19 @@ smp_callin(void)
/* Get our local ticker going. */
smp_setup_percpu_timer(cpuid);
+ init_clockevent();
/* Call platform-specific callin, if specified */
- if (alpha_mv.smp_callin) alpha_mv.smp_callin();
+ if (alpha_mv.smp_callin)
+ alpha_mv.smp_callin();
/* All kernel threads share the same mm context. */
atomic_inc(&init_mm.mm_count);
current->active_mm = &init_mm;
+ /* inform the notifiers about the new cpu */
+ notify_cpu_starting(cpuid);
+
/* Must have completely accurate bogos. */
local_irq_enable();
@@ -171,12 +168,12 @@ smp_callin(void)
DBGS(("smp_callin: commencing CPU %d current %p active_mm %p\n",
cpuid, current, current->active_mm));
- /* Do nothing. */
- cpu_idle();
+ preempt_disable();
+ cpu_startup_entry(CPUHP_ONLINE);
}
/* Wait until hwrpb->txrdy is clear for cpu. Return -1 on timeout. */
-static int __init
+static int
wait_for_txrdy (unsigned long cpumask)
{
unsigned long timeout;
@@ -199,7 +196,7 @@ wait_for_txrdy (unsigned long cpumask)
* Send a message to a secondary's console. "START" is one such
* interesting message. ;-)
*/
-static void __init
+static void
send_secondary_console_msg(char *str, int cpuid)
{
struct percpu_struct *cpu;
@@ -269,9 +266,10 @@ recv_secondary_console_msg(void)
if (cnt <= 0 || cnt >= 80)
strcpy(buf, "<<< BOGUS MSG >>>");
else {
- cp1 = (char *) &cpu->ipc_buffer[11];
+ cp1 = (char *) &cpu->ipc_buffer[1];
cp2 = buf;
- strcpy(cp2, cp1);
+ memcpy(cp2, cp1, cnt);
+ cp2[cnt] = '\0';
while ((cp2 = strchr(cp2, '\r')) != 0) {
*cp2 = ' ';
@@ -290,7 +288,7 @@ recv_secondary_console_msg(void)
/*
* Convince the console to have a secondary cpu begin execution.
*/
-static int __init
+static int
secondary_cpu_start(int cpuid, struct task_struct *idle)
{
struct percpu_struct *cpu;
@@ -302,7 +300,7 @@ secondary_cpu_start(int cpuid, struct task_struct *idle)
+ hwrpb->processor_offset
+ cpuid * hwrpb->processor_size);
hwpcb = (struct pcb_struct *) cpu->hwpcb;
- ipcb = &idle->thread_info->pcb;
+ ipcb = &task_thread_info(idle)->pcb;
/* Initialize the CPU's HWPCB to something just good enough for
us to get started. Immediately after starting, we'll swpctx
@@ -361,25 +359,11 @@ secondary_cpu_start(int cpuid, struct task_struct *idle)
/*
* Bring one cpu online.
*/
-static int __init
-smp_boot_one_cpu(int cpuid)
+static int
+smp_boot_one_cpu(int cpuid, struct task_struct *idle)
{
- struct task_struct *idle;
unsigned long timeout;
- /* Cook up an idler for this guy. Note that the address we
- give to kernel_thread is irrelevant -- it's going to start
- where HWRPB.CPU_restart says to start. But this gets all
- the other task-y sort of data structures set up like we
- wish. We can't use kernel_thread since we must avoid
- rescheduling the child. */
- idle = fork_idle(cpuid);
- if (IS_ERR(idle))
- panic("failed fork for CPU %d", cpuid);
-
- DBGS(("smp_boot_one_cpu: CPU %d state 0x%lx flags 0x%lx\n",
- cpuid, idle->state, idle->flags));
-
/* Signal the secondary to wait a moment. */
smp_secondary_alive = -1;
@@ -441,8 +425,8 @@ setup_smp(void)
((char *)cpubase + i*hwrpb->processor_size);
if ((cpu->flags & 0x1cc) == 0x1cc) {
smp_num_probed++;
- /* Assume here that "whami" == index */
- hwrpb_cpu_present_mask |= (1UL << i);
+ set_cpu_possible(i, true);
+ set_cpu_present(i, true);
cpu->pal_revision = boot_cpu_palrev;
}
@@ -453,12 +437,10 @@ setup_smp(void)
}
} else {
smp_num_probed = 1;
- hwrpb_cpu_present_mask = (1UL << boot_cpuid);
}
- cpu_present_mask = cpumask_of_cpu(boot_cpuid);
printk(KERN_INFO "SMP: %d CPUs probed -- cpu_present_mask = %lx\n",
- smp_num_probed, hwrpb_cpu_present_mask);
+ smp_num_probed, cpumask_bits(cpu_present_mask)[0]);
}
/*
@@ -467,8 +449,6 @@ setup_smp(void)
void __init
smp_prepare_cpus(unsigned int max_cpus)
{
- int cpu_count, i;
-
/* Take care of some initial bookkeeping. */
memset(ipi_data, 0, sizeof(ipi_data));
@@ -479,42 +459,26 @@ smp_prepare_cpus(unsigned int max_cpus)
/* Nothing to do on a UP box, or when told not to. */
if (smp_num_probed == 1 || max_cpus == 0) {
- cpu_present_mask = cpumask_of_cpu(boot_cpuid);
+ init_cpu_possible(cpumask_of(boot_cpuid));
+ init_cpu_present(cpumask_of(boot_cpuid));
printk(KERN_INFO "SMP mode deactivated.\n");
return;
}
printk(KERN_INFO "SMP starting up secondaries.\n");
- cpu_count = 1;
- for (i = 0; (i < NR_CPUS) && (cpu_count < max_cpus); i++) {
- if (i == boot_cpuid)
- continue;
-
- if (((hwrpb_cpu_present_mask >> i) & 1) == 0)
- continue;
-
- cpu_set(i, cpu_possible_map);
- cpu_count++;
- }
-
- smp_num_cpus = cpu_count;
+ smp_num_cpus = smp_num_probed;
}
-void __devinit
+void
smp_prepare_boot_cpu(void)
{
- /*
- * Mark the boot cpu (current cpu) as both present and online
- */
- cpu_set(smp_processor_id(), cpu_present_mask);
- cpu_set(smp_processor_id(), cpu_online_map);
}
-int __devinit
-__cpu_up(unsigned int cpu)
+int
+__cpu_up(unsigned int cpu, struct task_struct *tidle)
{
- smp_boot_one_cpu(cpu);
+ smp_boot_one_cpu(cpu, tidle);
return cpu_online(cpu) ? 0 : -ENOSYS;
}
@@ -536,32 +500,7 @@ smp_cpus_done(unsigned int max_cpus)
((bogosum + 2500) / (5000/HZ)) % 100);
}
-
-void
-smp_percpu_timer_interrupt(struct pt_regs *regs)
-{
- int cpu = smp_processor_id();
- unsigned long user = user_mode(regs);
- struct cpuinfo_alpha *data = &cpu_data[cpu];
-
- /* Record kernel PC. */
- profile_tick(CPU_PROFILING, regs);
-
- if (!--data->prof_counter) {
- /* We need to make like a normal interrupt -- otherwise
- timer interrupts ignore the global interrupt lock,
- which would be a Bad Thing. */
- irq_enter();
-
- update_process_times(user);
-
- data->prof_counter = data->prof_multiplier;
-
- irq_exit();
- }
-}
-
-int __init
+int
setup_profiling_timer(unsigned int multiplier)
{
return -EINVAL;
@@ -569,64 +508,19 @@ setup_profiling_timer(unsigned int multiplier)
static void
-send_ipi_message(cpumask_t to_whom, enum ipi_message_type operation)
+send_ipi_message(const struct cpumask *to_whom, enum ipi_message_type operation)
{
int i;
mb();
- for_each_cpu_mask(i, to_whom)
+ for_each_cpu(i, to_whom)
set_bit(operation, &ipi_data[i].bits);
mb();
- for_each_cpu_mask(i, to_whom)
+ for_each_cpu(i, to_whom)
wripir(i);
}
-/* Structure and data for smp_call_function. This is designed to
- minimize static memory requirements. Plus it looks cleaner. */
-
-struct smp_call_struct {
- void (*func) (void *info);
- void *info;
- long wait;
- atomic_t unstarted_count;
- atomic_t unfinished_count;
-};
-
-static struct smp_call_struct *smp_call_function_data;
-
-/* Atomicly drop data into a shared pointer. The pointer is free if
- it is initially locked. If retry, spin until free. */
-
-static int
-pointer_lock (void *lock, void *data, int retry)
-{
- void *old, *tmp;
-
- mb();
- again:
- /* Compare and swap with zero. */
- asm volatile (
- "1: ldq_l %0,%1\n"
- " mov %3,%2\n"
- " bne %0,2f\n"
- " stq_c %2,%1\n"
- " beq %2,1b\n"
- "2:"
- : "=&r"(old), "=m"(*(void **)lock), "=&r"(tmp)
- : "r"(data)
- : "memory");
-
- if (old == 0)
- return 0;
- if (! retry)
- return -EBUSY;
-
- while (*(void **)lock)
- barrier();
- goto again;
-}
-
void
handle_ipi(struct pt_regs *regs)
{
@@ -651,36 +545,16 @@ handle_ipi(struct pt_regs *regs)
switch (which) {
case IPI_RESCHEDULE:
- /* Reschedule callback. Everything to be done
- is done by the interrupt return path. */
+ scheduler_ipi();
break;
case IPI_CALL_FUNC:
- {
- struct smp_call_struct *data;
- void (*func)(void *info);
- void *info;
- int wait;
-
- data = smp_call_function_data;
- func = data->func;
- info = data->info;
- wait = data->wait;
-
- /* Notify the sending CPU that the data has been
- received, and execution is about to begin. */
- mb();
- atomic_dec (&data->unstarted_count);
-
- /* At this point the structure may be gone unless
- wait is true. */
- (*func)(info);
-
- /* Notify the sending CPU that the task is done. */
- mb();
- if (wait) atomic_dec (&data->unfinished_count);
+ generic_smp_call_function_interrupt();
+ break;
+
+ case IPI_CALL_FUNC_SINGLE:
+ generic_smp_call_function_single_interrupt();
break;
- }
case IPI_CPU_STOP:
halt();
@@ -709,114 +583,30 @@ smp_send_reschedule(int cpu)
printk(KERN_WARNING
"smp_send_reschedule: Sending IPI to self.\n");
#endif
- send_ipi_message(cpumask_of_cpu(cpu), IPI_RESCHEDULE);
+ send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);
}
void
smp_send_stop(void)
{
- cpumask_t to_whom = cpu_possible_map;
- cpu_clear(smp_processor_id(), to_whom);
+ cpumask_t to_whom;
+ cpumask_copy(&to_whom, cpu_possible_mask);
+ cpumask_clear_cpu(smp_processor_id(), &to_whom);
#ifdef DEBUG_IPI_MSG
if (hard_smp_processor_id() != boot_cpu_id)
printk(KERN_WARNING "smp_send_stop: Not on boot cpu.\n");
#endif
- send_ipi_message(to_whom, IPI_CPU_STOP);
+ send_ipi_message(&to_whom, IPI_CPU_STOP);
}
-/*
- * Run a function on all other CPUs.
- * <func> The function to run. This must be fast and non-blocking.
- * <info> An arbitrary pointer to pass to the function.
- * <retry> If true, keep retrying until ready.
- * <wait> If true, wait until function has completed on other CPUs.
- * [RETURNS] 0 on success, else a negative status code.
- *
- * Does not return until remote CPUs are nearly ready to execute <func>
- * or are or have executed.
- * You must not call this function with disabled interrupts or from a
- * hardware interrupt handler or from a bottom half handler.
- */
-
-int
-smp_call_function_on_cpu (void (*func) (void *info), void *info, int retry,
- int wait, cpumask_t to_whom)
+void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
- struct smp_call_struct data;
- unsigned long timeout;
- int num_cpus_to_call;
-
- /* Can deadlock when called with interrupts disabled */
- WARN_ON(irqs_disabled());
-
- data.func = func;
- data.info = info;
- data.wait = wait;
-
- cpu_clear(smp_processor_id(), to_whom);
- num_cpus_to_call = cpus_weight(to_whom);
-
- atomic_set(&data.unstarted_count, num_cpus_to_call);
- atomic_set(&data.unfinished_count, num_cpus_to_call);
-
- /* Acquire the smp_call_function_data mutex. */
- if (pointer_lock(&smp_call_function_data, &data, retry))
- return -EBUSY;
-
- /* Send a message to the requested CPUs. */
- send_ipi_message(to_whom, IPI_CALL_FUNC);
-
- /* Wait for a minimal response. */
- timeout = jiffies + HZ;
- while (atomic_read (&data.unstarted_count) > 0
- && time_before (jiffies, timeout))
- barrier();
-
- /* If there's no response yet, log a message but allow a longer
- * timeout period -- if we get a response this time, log
- * a message saying when we got it..
- */
- if (atomic_read(&data.unstarted_count) > 0) {
- long start_time = jiffies;
- printk(KERN_ERR "%s: initial timeout -- trying long wait\n",
- __FUNCTION__);
- timeout = jiffies + 30 * HZ;
- while (atomic_read(&data.unstarted_count) > 0
- && time_before(jiffies, timeout))
- barrier();
- if (atomic_read(&data.unstarted_count) <= 0) {
- long delta = jiffies - start_time;
- printk(KERN_ERR
- "%s: response %ld.%ld seconds into long wait\n",
- __FUNCTION__, delta / HZ,
- (100 * (delta - ((delta / HZ) * HZ))) / HZ);
- }
- }
-
- /* We either got one or timed out -- clear the lock. */
- mb();
- smp_call_function_data = NULL;
-
- /*
- * If after both the initial and long timeout periods we still don't
- * have a response, something is very wrong...
- */
- BUG_ON(atomic_read (&data.unstarted_count) > 0);
-
- /* Wait for a complete response, if needed. */
- if (wait) {
- while (atomic_read (&data.unfinished_count) > 0)
- barrier();
- }
-
- return 0;
+ send_ipi_message(mask, IPI_CALL_FUNC);
}
-int
-smp_call_function (void (*func) (void *info), void *info, int retry, int wait)
+void arch_send_call_function_single_ipi(int cpu)
{
- return smp_call_function_on_cpu (func, info, retry, wait,
- cpu_online_map);
+ send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
}
static void
@@ -829,9 +619,10 @@ void
smp_imb(void)
{
/* Must wait other processors to flush their icache before continue. */
- if (on_each_cpu(ipi_imb, NULL, 1, 1))
+ if (on_each_cpu(ipi_imb, NULL, 1))
printk(KERN_CRIT "smp_imb: timed out\n");
}
+EXPORT_SYMBOL(smp_imb);
static void
ipi_flush_tlb_all(void *ignored)
@@ -844,7 +635,7 @@ flush_tlb_all(void)
{
/* Although we don't have any data to pass, we do want to
synchronize with the other processors. */
- if (on_each_cpu(ipi_flush_tlb_all, NULL, 1, 1)) {
+ if (on_each_cpu(ipi_flush_tlb_all, NULL, 1)) {
printk(KERN_CRIT "flush_tlb_all: timed out\n");
}
}
@@ -881,12 +672,13 @@ flush_tlb_mm(struct mm_struct *mm)
}
}
- if (smp_call_function(ipi_flush_tlb_mm, mm, 1, 1)) {
+ if (smp_call_function(ipi_flush_tlb_mm, mm, 1)) {
printk(KERN_CRIT "flush_tlb_mm: timed out\n");
}
preempt_enable();
}
+EXPORT_SYMBOL(flush_tlb_mm);
struct flush_tlb_page_struct {
struct vm_area_struct *vma;
@@ -933,12 +725,13 @@ flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
data.mm = mm;
data.addr = addr;
- if (smp_call_function(ipi_flush_tlb_page, &data, 1, 1)) {
+ if (smp_call_function(ipi_flush_tlb_page, &data, 1)) {
printk(KERN_CRIT "flush_tlb_page: timed out\n");
}
preempt_enable();
}
+EXPORT_SYMBOL(flush_tlb_page);
void
flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
@@ -946,6 +739,7 @@ flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long e
/* On the Alpha we always flush the whole user tlb. */
flush_tlb_mm(vma->vm_mm);
}
+EXPORT_SYMBOL(flush_tlb_range);
static void
ipi_flush_icache_page(void *x)
@@ -983,181 +777,9 @@ flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
}
}
- if (smp_call_function(ipi_flush_icache_page, mm, 1, 1)) {
+ if (smp_call_function(ipi_flush_icache_page, mm, 1)) {
printk(KERN_CRIT "flush_icache_page: timed out\n");
}
preempt_enable();
}
-
-#ifdef CONFIG_DEBUG_SPINLOCK
-void
-_raw_spin_unlock(spinlock_t * lock)
-{
- mb();
- lock->lock = 0;
-
- lock->on_cpu = -1;
- lock->previous = NULL;
- lock->task = NULL;
- lock->base_file = "none";
- lock->line_no = 0;
-}
-
-void
-debug_spin_lock(spinlock_t * lock, const char *base_file, int line_no)
-{
- long tmp;
- long stuck;
- void *inline_pc = __builtin_return_address(0);
- unsigned long started = jiffies;
- int printed = 0;
- int cpu = smp_processor_id();
-
- stuck = 1L << 30;
- try_again:
-
- /* Use sub-sections to put the actual loop at the end
- of this object file's text section so as to perfect
- branch prediction. */
- __asm__ __volatile__(
- "1: ldl_l %0,%1\n"
- " subq %2,1,%2\n"
- " blbs %0,2f\n"
- " or %0,1,%0\n"
- " stl_c %0,%1\n"
- " beq %0,3f\n"
- "4: mb\n"
- ".subsection 2\n"
- "2: ldl %0,%1\n"
- " subq %2,1,%2\n"
- "3: blt %2,4b\n"
- " blbs %0,2b\n"
- " br 1b\n"
- ".previous"
- : "=r" (tmp), "=m" (lock->lock), "=r" (stuck)
- : "m" (lock->lock), "2" (stuck) : "memory");
-
- if (stuck < 0) {
- printk(KERN_WARNING
- "%s:%d spinlock stuck in %s at %p(%d)"
- " owner %s at %p(%d) %s:%d\n",
- base_file, line_no,
- current->comm, inline_pc, cpu,
- lock->task->comm, lock->previous,
- lock->on_cpu, lock->base_file, lock->line_no);
- stuck = 1L << 36;
- printed = 1;
- goto try_again;
- }
-
- /* Exiting. Got the lock. */
- lock->on_cpu = cpu;
- lock->previous = inline_pc;
- lock->task = current;
- lock->base_file = base_file;
- lock->line_no = line_no;
-
- if (printed) {
- printk(KERN_WARNING
- "%s:%d spinlock grabbed in %s at %p(%d) %ld ticks\n",
- base_file, line_no, current->comm, inline_pc,
- cpu, jiffies - started);
- }
-}
-
-int
-debug_spin_trylock(spinlock_t * lock, const char *base_file, int line_no)
-{
- int ret;
- if ((ret = !test_and_set_bit(0, lock))) {
- lock->on_cpu = smp_processor_id();
- lock->previous = __builtin_return_address(0);
- lock->task = current;
- } else {
- lock->base_file = base_file;
- lock->line_no = line_no;
- }
- return ret;
-}
-#endif /* CONFIG_DEBUG_SPINLOCK */
-
-#ifdef CONFIG_DEBUG_RWLOCK
-void _raw_write_lock(rwlock_t * lock)
-{
- long regx, regy;
- int stuck_lock, stuck_reader;
- void *inline_pc = __builtin_return_address(0);
-
- try_again:
-
- stuck_lock = 1<<30;
- stuck_reader = 1<<30;
-
- __asm__ __volatile__(
- "1: ldl_l %1,%0\n"
- " blbs %1,6f\n"
- " blt %1,8f\n"
- " mov 1,%1\n"
- " stl_c %1,%0\n"
- " beq %1,6f\n"
- "4: mb\n"
- ".subsection 2\n"
- "6: blt %3,4b # debug\n"
- " subl %3,1,%3 # debug\n"
- " ldl %1,%0\n"
- " blbs %1,6b\n"
- "8: blt %4,4b # debug\n"
- " subl %4,1,%4 # debug\n"
- " ldl %1,%0\n"
- " blt %1,8b\n"
- " br 1b\n"
- ".previous"
- : "=m" (*(volatile int *)lock), "=&r" (regx), "=&r" (regy),
- "=&r" (stuck_lock), "=&r" (stuck_reader)
- : "m" (*(volatile int *)lock), "3" (stuck_lock), "4" (stuck_reader) : "memory");
-
- if (stuck_lock < 0) {
- printk(KERN_WARNING "write_lock stuck at %p\n", inline_pc);
- goto try_again;
- }
- if (stuck_reader < 0) {
- printk(KERN_WARNING "write_lock stuck on readers at %p\n",
- inline_pc);
- goto try_again;
- }
-}
-
-void _raw_read_lock(rwlock_t * lock)
-{
- long regx;
- int stuck_lock;
- void *inline_pc = __builtin_return_address(0);
-
- try_again:
-
- stuck_lock = 1<<30;
-
- __asm__ __volatile__(
- "1: ldl_l %1,%0;"
- " blbs %1,6f;"
- " subl %1,2,%1;"
- " stl_c %1,%0;"
- " beq %1,6f;"
- "4: mb\n"
- ".subsection 2\n"
- "6: ldl %1,%0;"
- " blt %2,4b # debug\n"
- " subl %2,1,%2 # debug\n"
- " blbs %1,6b;"
- " br 1b\n"
- ".previous"
- : "=m" (*(volatile int *)lock), "=&r" (regx), "=&r" (stuck_lock)
- : "m" (*(volatile int *)lock), "2" (stuck_lock) : "memory");
-
- if (stuck_lock < 0) {
- printk(KERN_WARNING "read_lock stuck at %p\n", inline_pc);
- goto try_again;
- }
-}
-#endif /* CONFIG_DEBUG_RWLOCK */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-08 12:42:17 +0000