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osdep: Document differences in rounding macros
Make it obvious which macros are safe in which situations. Useful since QEMU_ALIGN_UP and ROUND_UP both purport to do the same thing, but differ on whether the alignment must be a power of 2.
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@ -141,7 +141,8 @@
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/* Round number down to multiple */
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#define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))
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/* Round number up to multiple */
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/* Round number up to multiple. Safe when m is not a power of 2 (see
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* ROUND_UP for a faster version when a power of 2 is guaranteed) */
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#define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))
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/* Check if n is a multiple of m */
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@ -172,6 +173,9 @@
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#define QEMU_PTR_IS_ALIGNED(p, n) QEMU_IS_ALIGNED((uintptr_t)(p), (n))
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#endif
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/* Round number up to multiple. Requires that d be a power of 2 (see
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* QEMU_ALIGN_UP for a safer but slower version on arbitrary
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* numbers) */
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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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