76 lines
2.6 KiB
Diff
76 lines
2.6 KiB
Diff
|
From d9fa07a04ee19ad713b053f6a649178361d822a8 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Paolo Bonzini <pbonzini@redhat.com>
|
||
|
|
Date: Fri, 16 Jul 2021 16:51:31 -0400
|
||
|
|
Subject: [PATCH 15/43] osdep: provide ROUND_DOWN macro
|
||
|
|
|
||
|
|
RH-Author: Miroslav Rezanina <mrezanin@redhat.com>
|
||
|
|
RH-Bugzilla: 1957194
|
||
|
|
|
||
|
|
osdep.h provides a ROUND_UP macro to hide bitwise operations for the
|
||
|
|
purpose of rounding a number up to a power of two; add a ROUND_DOWN
|
||
|
|
macro that does the same with truncation towards zero.
|
||
|
|
|
||
|
|
While at it, change the formatting of some comments.
|
||
|
|
|
||
|
|
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
|
||
|
|
(cherry picked from commit c9797456f64ce72c03eb2969d97ac1dd4698d91e)
|
||
|
|
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
|
||
|
|
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
|
||
|
|
---
|
||
|
|
include/qemu/osdep.h | 28 ++++++++++++++++++++++------
|
||
|
|
1 file changed, 22 insertions(+), 6 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
|
||
|
|
index cb2a07e472..e327220992 100644
|
||
|
|
--- a/include/qemu/osdep.h
|
||
|
|
+++ b/include/qemu/osdep.h
|
||
|
|
@@ -316,11 +316,16 @@ extern "C" {
|
||
|
|
})
|
||
|
|
#endif
|
||
|
|
|
||
|
|
-/* Round number down to multiple */
|
||
|
|
+/*
|
||
|
|
+ * Round number down to multiple. Safe when m is not a power of 2 (see
|
||
|
|
+ * ROUND_DOWN for a faster version when a power of 2 is guaranteed).
|
||
|
|
+ */
|
||
|
|
#define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))
|
||
|
|
|
||
|
|
-/* Round number up to multiple. Safe when m is not a power of 2 (see
|
||
|
|
- * ROUND_UP for a faster version when a power of 2 is guaranteed) */
|
||
|
|
+/*
|
||
|
|
+ * Round number up to multiple. Safe when m is not a power of 2 (see
|
||
|
|
+ * ROUND_UP for a faster version when a power of 2 is guaranteed).
|
||
|
|
+ */
|
||
|
|
#define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))
|
||
|
|
|
||
|
|
/* Check if n is a multiple of m */
|
||
|
|
@@ -337,11 +342,22 @@ extern "C" {
|
||
|
|
/* Check if pointer p is n-bytes aligned */
|
||
|
|
#define QEMU_PTR_IS_ALIGNED(p, n) QEMU_IS_ALIGNED((uintptr_t)(p), (n))
|
||
|
|
|
||
|
|
-/* Round number up to multiple. Requires that d be a power of 2 (see
|
||
|
|
+/*
|
||
|
|
+ * Round number down to multiple. Requires that d be a power of 2 (see
|
||
|
|
* QEMU_ALIGN_UP for a safer but slower version on arbitrary
|
||
|
|
- * numbers); works even if d is a smaller type than n. */
|
||
|
|
+ * numbers); works even if d is a smaller type than n.
|
||
|
|
+ */
|
||
|
|
+#ifndef ROUND_DOWN
|
||
|
|
+#define ROUND_DOWN(n, d) ((n) & -(0 ? (n) : (d)))
|
||
|
|
+#endif
|
||
|
|
+
|
||
|
|
+/*
|
||
|
|
+ * Round number up to multiple. Requires that d be a power of 2 (see
|
||
|
|
+ * QEMU_ALIGN_UP for a safer but slower version on arbitrary
|
||
|
|
+ * numbers); works even if d is a smaller type than n.
|
||
|
|
+ */
|
||
|
|
#ifndef ROUND_UP
|
||
|
|
-#define ROUND_UP(n, d) (((n) + (d) - 1) & -(0 ? (n) : (d)))
|
||
|
|
+#define ROUND_UP(n, d) ROUND_DOWN((n) + (d) - 1, (d))
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef DIV_ROUND_UP
|
||
|
|
--
|
||
|
|
2.27.0
|
||
|
|
|