Re: [PATCH v4 01/19] ioprio: cleanup interface definition

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On 3/16/23 10:58, Bart Van Assche wrote:
On 3/9/23 13:54, Niklas Cassel wrote:
  /*
- * The RT and BE priority classes both support up to 8 priority levels.
+ * The RT and BE priority classes both support up to 8 priority levels that
+ * can be specified using the lower 3-bits of the priority data.
   */
-#define IOPRIO_NR_LEVELS    8
-#define IOPRIO_BE_NR        IOPRIO_NR_LEVELS
+#define IOPRIO_LEVEL_NR_BITS        3
+#define IOPRIO_NR_LEVELS        (1 << IOPRIO_LEVEL_NR_BITS)
+#define IOPRIO_LEVEL_MASK        (IOPRIO_NR_LEVELS - 1)
+#define IOPRIO_PRIO_LEVEL(ioprio)    ((ioprio) & IOPRIO_LEVEL_MASK)
+#define IOPRIO_BE_NR            IOPRIO_NR_LEVELS

Is my understanding correct that today four I/O priority levels are supported and that these occupy two bits?

Please ignore the above question - according to the ioprio_get() man page there are eight levels.

Bart.




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