On 06/13/18 14:22, Bruce Evans wrote:
+/*
+ * The major and minor numbers are encoded in dev_t as MMMmmmMm (where
+ * letters correspond to bytes). The encoding of the lower 4 bytes is
+ * constrained by compatibility with 16-bit and 32-bit dev_t's. The
+ * encoding of of the upper 4 bytes is the least unnatural one consistent
+ * with this and other constraints. Also, the decoding of the m bytes by
+ * minor() is unnatural to maximize compatibility subject to not discarding
+ * bits. The upper m byte is shifted into the position of the lower M byte
+ * instead of shifting 3 upper m bytes to close the gap. Compatibility for
+ * minor() is achieved iff the upper m byte is 0.
+ */
+#define major(d) __major(d)
+static __inline int
+__major(dev_t _d)
+{
+ return (((_d >> 32) & 0xffffff00) | ((_d >> 8) & 0xff));
+}
+#define minor(d) __minor(d)
+static __inline int
+__minor(dev_t _d)
+{
+ return (((_d >> 24) & 0xff00) | (_d & 0xffff00ff));
+}
+#define makedev(M, m) __makedev((M), (m))
+static __inline dev_t
+__makedev(int _M, int _m)
+{
+ return (((dev_t)(_M & 0xffffff00) << 32) | ((_M & 0xff) << 8) |
+ ((dev_t)(_m & 0xff00) << 24) | (_m & 0xffff00ff));
+}
Can you use all macros here? This breaks OFED, because __makedev() is
used to initialize variables.
--HPS
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