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From 6e14ac55a7b40804cf69de560f38561214129b07 Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Mon, 11 Jul 2016 05:33:34 +0200
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Subject: [PATCH 1/7] util: introduce MIN_NON_ZERO
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <1468215219-30793-2-git-send-email-famz@redhat.com>
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Patchwork-id: 71105
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O-Subject: [RHEL-7.3 qemu-kvm PATCH 1/6] util: introduce MIN_NON_ZERO
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Bugzilla: 1318199
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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From: Peter Lieven <pl@kamp.de>
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at least in block layer we have the case of limits being defined for a
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BlockDriverState. However, in this context often zero (0) has the special
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meanining of undefined which means no limit. If two of those limits are
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combined and the minimum is needed the minimum function should only return
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zero if both parameters are zero.
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Signed-off-by: Peter Lieven <pl@kamp.de>
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Reviewed-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit ac3a8726644d4783eacf54212d23db01d1d30044)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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include/qemu/osdep.h | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
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index 8984da0..c47a600 100644
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--- a/include/qemu/osdep.h
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+++ b/include/qemu/osdep.h
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@@ -68,6 +68,12 @@ typedef signed int int_fast16_t;
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#define MAX(a, b) (((a) > (b)) ? (a) : (b))
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#endif
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+/* Minimum function that returns zero only iff both values are zero.
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+ * Intended for use with unsigned values only. */
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+#ifndef MIN_NON_ZERO
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+#define MIN_NON_ZERO(a, b) (((a) != 0 && (a) < (b)) ? (a) : (b))
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+#endif
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+
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#ifndef ROUND_UP
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#define ROUND_UP(n,d) (((n) + (d) - 1) & -(d))
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#endif
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--
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1.8.3.1
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