linux-kernel - [PATCH] lib/test_lockup: Rename disable

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Date:   Tue, 17 Mar 2020 06:36:14 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Subject: [PATCH] lib/test_lockup: Rename disable_irq to fix build error

mips:allmodconfig fails to build.

lib/test_lockup.c:87:13: error:
	'disable_irq' redeclared as different kind of symbol
   87 | static bool disable_irq;
      |             ^~~~~~~~~~~
In file included from arch/mips/include/asm/highmem.h:24,
                 from arch/mips/include/asm/pgtable-32.h:22,
                 from arch/mips/include/asm/pgtable.h:14,
                 from include/linux/mm.h:95,
                 from lib/test_lockup.c:15:
include/linux/interrupt.h:237:13: note:
	previous declaration of 'disable_irq' was here
  237 | extern void disable_irq(unsigned int irq);

Rename the variable to fix the problem.

Fixes: 0e86238873f3 ("lib/test_lockup: test module to generate lockups")
Cc: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 lib/test_lockup.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/lib/test_lockup.c b/lib/test_lockup.c
index b45afd3ad7cb..83683ec1f429 100644
--- a/lib/test_lockup.c
+++ b/lib/test_lockup.c
@@ -84,8 +84,8 @@ static unsigned long lock_wait_threshold = ULONG_MAX;
 module_param(lock_wait_threshold, ulong, 0400);
 MODULE_PARM_DESC(lock_wait_threshold, "print lock wait time longer than this in nanoseconds, default off");
 
-static bool disable_irq;
-module_param(disable_irq, bool, 0400);
+static bool test_disable_irq;
+module_param_named(disable_irq, test_disable_irq, bool, 0400);
 MODULE_PARM_DESC(disable_irq, "disable interrupts: generate hard-lockups");
 
 static bool disable_softirq;
@@ -179,7 +179,7 @@ static void test_lock(bool master, bool verbose)
 			down_write(&main_task->mm->mmap_sem);
 	}
 
-	if (disable_irq)
+	if (test_disable_irq)
 		local_irq_disable();
 
 	if (disable_softirq)
@@ -252,7 +252,7 @@ static void test_unlock(bool master, bool verbose)
 	if (disable_softirq)
 		local_bh_enable();
 
-	if (disable_irq)
+	if (test_disable_irq)
 		local_irq_enable();
 
 	if (lock_mmap_sem && master) {
@@ -479,8 +479,8 @@ static int __init test_lockup_init(void)
 	if ((wait_state != TASK_RUNNING ||
 	     (call_cond_resched && !reacquire_locks) ||
 	     (alloc_pages_nr && gfpflags_allow_blocking(alloc_pages_gfp))) &&
-	    (disable_irq || disable_softirq || disable_preempt || lock_rcu ||
-	     lock_spinlock_ptr || lock_rwlock_ptr)) {
+	    (test_disable_irq || disable_softirq || disable_preempt ||
+	     lock_rcu || lock_spinlock_ptr || lock_rwlock_ptr)) {
 		pr_err("refuse to sleep in atomic context\n");
 		return -EINVAL;
 	}
@@ -495,7 +495,7 @@ static int __init test_lockup_init(void)
 		  cooldown_secs, cooldown_nsecs, iterations, state,
 		  all_cpus ? "all_cpus " : "",
 		  iowait ? "iowait " : "",
-		  disable_irq ? "disable_irq " : "",
+		  test_disable_irq ? "disable_irq " : "",
 		  disable_softirq ? "disable_softirq " : "",
 		  disable_preempt ? "disable_preempt " : "",
 		  lock_rcu ? "lock_rcu " : "",
-- 
2.17.1