linux-kernel - [PATCH] s390/pci: Use the bitmap API to allocate bitmaps

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Message-Id: <8d35e482f710889a45d46f808155738ef87d46c4.1657383052.git.christophe.jaillet@wanadoo.fr>
Date:   Sat,  9 Jul 2022 18:11:28 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-s390@...r.kernel.org
Subject: [PATCH] s390/pci: Use the bitmap API to allocate bitmaps

Use bitmap_zalloc()/bitmap_free() instead of hand-writing them.

It is less verbose and it improves the semantic.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
I don't know why commit c506fff3d3a8 ("s390/pci: resize iomap") has turned
this bitmap from a statically defined bitmap to a runtime-allocated one.

Going back to a:
	static DECLARE_BITMAP(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
would slightly simply code.
---
 arch/s390/pci/pci.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index bc980fd313d5..b965553de143 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -1059,8 +1059,7 @@ static int zpci_mem_init(void)
 	if (!zpci_iomap_start)
 		goto error_iomap;
 
-	zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
-				    sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
+	zpci_iomap_bitmap = bitmap_zalloc(ZPCI_IOMAP_ENTRIES, GFP_KERNEL);
 	if (!zpci_iomap_bitmap)
 		goto error_iomap_bitmap;
 
@@ -1078,7 +1077,7 @@ static int zpci_mem_init(void)
 
 static void zpci_mem_exit(void)
 {
-	kfree(zpci_iomap_bitmap);
+	bitmap_free(zpci_iomap_bitmap);
 	kfree(zpci_iomap_start);
 	kmem_cache_destroy(zdev_fmb_cache);
 }
-- 
2.34.1