linux-kernel - [PATCH] powerpc/xive: Fix some incorrect memory allocation

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Date:   Sat, 25 Jun 2022 11:49:31 +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>,
        Cédric Le Goater <clg@...d.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] powerpc/xive: Fix some incorrect memory allocation

'xibm->count' really looks like a number of bits (see how it is used in
__xive_irq_bitmap_alloc()), so use the bitmap API to allocate and free this
bitmap.

This improves semantic and potentially avoids some over memory allocation.

Fixes: eac1e731b59e ("powerpc/xive: guest exploitation of the XIVE interrupt controller")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
I don't cross compile, so this patch is NOT compile-tested.
---
 arch/powerpc/sysdev/xive/spapr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/sysdev/xive/spapr.c b/arch/powerpc/sysdev/xive/spapr.c
index 7d5128676e83..fdbebb14b7de 100644
--- a/arch/powerpc/sysdev/xive/spapr.c
+++ b/arch/powerpc/sysdev/xive/spapr.c
@@ -57,7 +57,7 @@ static int __init xive_irq_bitmap_add(int base, int count)
 	spin_lock_init(&xibm->lock);
 	xibm->base = base;
 	xibm->count = count;
-	xibm->bitmap = kzalloc(xibm->count, GFP_KERNEL);
+	xibm->bitmap = bitmap_zalloc(xibm->count, GFP_KERNEL);
 	if (!xibm->bitmap) {
 		kfree(xibm);
 		return -ENOMEM;
@@ -75,7 +75,7 @@ static void xive_irq_bitmap_remove_all(void)
 
 	list_for_each_entry_safe(xibm, tmp, &xive_irq_bitmaps, list) {
 		list_del(&xibm->list);
-		kfree(xibm->bitmap);
+		bitmap_free(xibm->bitmap);
 		kfree(xibm);
 	}
 }
-- 
2.34.1