linux-kernel - [PATCH v4 06/40] mips: sgi-ip30: optimize heart_alloc_int() by using find_and_set

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Message-ID: <20240620175703.605111-7-yury.norov@gmail.com>
Date: Thu, 20 Jun 2024 10:56:29 -0700
From: Yury Norov <yury.norov@...il.com>
To: linux-kernel@...r.kernel.org,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	linux-mips@...r.kernel.org
Cc: Yury Norov <yury.norov@...il.com>,
	Alexey Klimov <alexey.klimov@...aro.org>,
	Bart Van Assche <bvanassche@....org>,
	Jan Kara <jack@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Wilcox <willy@...radead.org>,
	Mirsad Todorovac <mirsad.todorovac@....unizg.hr>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Sergey Shtylyov <s.shtylyov@....ru>
Subject: [PATCH v4 06/40] mips: sgi-ip30: optimize heart_alloc_int() by using find_and_set_bit()

heart_alloc_int() opencodes find_and_set_bit(). Simplify it by using the
dedicated function, and make a nice one-liner.

Signed-off-by: Yury Norov <yury.norov@...il.com>
---
 arch/mips/sgi-ip30/ip30-irq.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/arch/mips/sgi-ip30/ip30-irq.c b/arch/mips/sgi-ip30/ip30-irq.c
index 423c32cb66ed..a70e7af93643 100644
--- a/arch/mips/sgi-ip30/ip30-irq.c
+++ b/arch/mips/sgi-ip30/ip30-irq.c
@@ -2,6 +2,7 @@
 /*
  * ip30-irq.c: Highlevel interrupt handling for IP30 architecture.
  */
+#include <linux/find_atomic.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
@@ -28,17 +29,9 @@ static DEFINE_PER_CPU(unsigned long, irq_enable_mask);
 
 static inline int heart_alloc_int(void)
 {
-	int bit;
+	int bit = find_and_set_bit(heart_irq_map, HEART_NUM_IRQS);
 
-again:
-	bit = find_first_zero_bit(heart_irq_map, HEART_NUM_IRQS);
-	if (bit >= HEART_NUM_IRQS)
-		return -ENOSPC;
-
-	if (test_and_set_bit(bit, heart_irq_map))
-		goto again;
-
-	return bit;
+	return bit < HEART_NUM_IRQS ? bit : -ENOSPC;
 }
 
 static void ip30_error_irq(struct irq_desc *desc)
-- 
2.43.0