[PATCH v2 11/11] smp: modify up.c to adopt the same format of cross CPU call.

From: Donghai Qiao <dqiao@redhat.com>
To: akpm@linux-foundation.org, sfr@canb.auug.org.au, arnd@arndb.de,
	peterz@infradead.org, heying24@huawei.com,
	andriy.shevchenko@linux.intel.com, axboe@kernel.dk,
	rdunlap@infradead.org, tglx@linutronix.de, gor@linux.ibm.com
Cc: donghai.w.qiao@gmail.com, linux-kernel@vger.kernel.org,
	Donghai Qiao <dqiao@redhat.com>
Subject: [PATCH v2 11/11] smp: modify up.c to adopt the same format of cross CPU call.
Date: Fri, 22 Apr 2022 16:00:40 -0400	[thread overview]
Message-ID: <20220422200040.93813-12-dqiao@redhat.com> (raw)
In-Reply-To: <20220422200040.93813-1-dqiao@redhat.com>

Since smp.c has been changed to use the new interface, up.c should
be changed to use the uniprocessor version of cross call as well.

Signed-off-by: Donghai Qiao <dqiao@redhat.com>
---
v1 -> v2: removed 'x' from the function names and change XCALL to SMP_CALL from the new macros

 kernel/up.c | 56 +++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 42 insertions(+), 14 deletions(-)

diff --git a/kernel/up.c b/kernel/up.c
index a38b8b095251..b442e011a059 100644
--- a/kernel/up.c
+++ b/kernel/up.c
@@ -9,8 +9,7 @@
 #include <linux/smp.h>
 #include <linux/hypervisor.h>
 
-int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
-				int wait)
+int smp_call(int cpu, void (*func) (void *info), void *info, unsigned int type)
 {
 	unsigned long flags;
 
@@ -23,37 +22,66 @@ int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
 
 	return 0;
 }
-EXPORT_SYMBOL(smp_call_function_single);
+EXPORT_SYMBOL(smp_call);
 
-int smp_call_function_single_async(int cpu, struct __call_single_data *csd)
+int smp_call_cond(int cpu, smp_call_func_t func, void *info,
+		   smp_cond_func_t cond_func, unsigned int type)
+{
+	int ret = 0;
+
+	preempt_disable();
+	if (!cond_func || cond_func(0, info))
+		ret = smp_call(cpu, func, info, type);
+
+	preempt_enable();
+
+	return ret;
+}
+EXPORT_SYMBOL(smp_call_cond);
+
+void smp_call_mask(const struct cpumask *mask, smp_call_func_t func, void *info, unsigned int type)
 {
 	unsigned long flags;
 
-	local_irq_save(flags);
-	csd->func(csd->info);
-	local_irq_restore(flags);
+	if (!cpumask_test_cpu(0, mask))
+		return;
+
+	preempt_disable();
+	smp_call(cpu, func, info, type);
+	preempt_enable();
+}
+EXPORT_SYMBOL(smp_call_mask);
+
+int smp_call_private(int cpu, struct __call_single_data *csd, unsigned int type)
+{
+	preempt_disable();
+
+	if (csd->func != NULL)
+		smp_call(cpu, csd->func, csd->info, type);
+
+	preempt_enable();
+
 	return 0;
 }
-EXPORT_SYMBOL(smp_call_function_single_async);
+EXPORT_SYMBOL(smp_call_private);
 
 /*
  * Preemption is disabled here to make sure the cond_func is called under the
  * same conditions in UP and SMP.
  */
-void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func,
-			   void *info, bool wait, const struct cpumask *mask)
+void smp_call_mask_cond(const struct cpumask *mask, smp_call_func_t func,
+			 void *info, smp_cond_func_t cond_func,
+			 unsigned int type)
 {
 	unsigned long flags;
 
 	preempt_disable();
 	if ((!cond_func || cond_func(0, info)) && cpumask_test_cpu(0, mask)) {
-		local_irq_save(flags);
-		func(info);
-		local_irq_restore(flags);
+		smp_call(cpu, func, info, type);
 	}
 	preempt_enable();
 }
-EXPORT_SYMBOL(on_each_cpu_cond_mask);
+EXPORT_SYMBOL(smp_call_mask_cond);
 
 int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
 {
-- 
2.27.0

