linux-kernel - [PATCH] KVM: PPC: Book3S HV: Use the bitmap API to allocate bitmaps

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Date:   Sat,  9 Jul 2022 17:56:43 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] KVM: PPC: Book3S HV: 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>
---
 arch/powerpc/kvm/book3s_hv_uvmem.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_hv_uvmem.c b/arch/powerpc/kvm/book3s_hv_uvmem.c
index 598006301620..95de5fac6497 100644
--- a/arch/powerpc/kvm/book3s_hv_uvmem.c
+++ b/arch/powerpc/kvm/book3s_hv_uvmem.c
@@ -1187,8 +1187,7 @@ int kvmppc_uvmem_init(void)
 
 	pfn_first = res->start >> PAGE_SHIFT;
 	pfn_last = pfn_first + (resource_size(res) >> PAGE_SHIFT);
-	kvmppc_uvmem_bitmap = kcalloc(BITS_TO_LONGS(pfn_last - pfn_first),
-				      sizeof(unsigned long), GFP_KERNEL);
+	kvmppc_uvmem_bitmap = bitmap_zalloc(pfn_last - pfn_first, GFP_KERNEL);
 	if (!kvmppc_uvmem_bitmap) {
 		ret = -ENOMEM;
 		goto out_unmap;
@@ -1212,5 +1211,5 @@ void kvmppc_uvmem_free(void)
 	memunmap_pages(&kvmppc_uvmem_pgmap);
 	release_mem_region(kvmppc_uvmem_pgmap.range.start,
 			   range_len(&kvmppc_uvmem_pgmap.range));
-	kfree(kvmppc_uvmem_bitmap);
+	bitmap_free(kvmppc_uvmem_bitmap);
 }
-- 
2.34.1