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[1/2] include/uapi pps.h: increase PPS_MAX_SOURCES value

Message ID 20230630071826.105501-1-giometti@enneenne.com
State New
Headers
Series [1/2] include/uapi pps.h: increase PPS_MAX_SOURCES value |

Commit Message

Rodolfo Giometti June 30, 2023, 7:18 a.m. UTC 
  From: Charlie Johnston <charlie.johnston@ni.com>

For consistency with what others use for minors, this change sets
PPS_MAX_SOURCES to MINORMASK.

The PPS_MAX_SOURCES value is currently set to 16. In some cases this
was not sufficient for a system. For example, a system with multiple
(4+) PCIe cards each with 4 PTP-capable ethernet interfaces could run
out of the available PPS major:minors if each interface registers a
PPS source.

Signed-off-by: Charlie Johnston <charlie.johnston@ni.com>
Acked-by: Rodolfo Giometti <giometti@enneenne.com>
---
 include/uapi/linux/pps.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/include/uapi/linux/pps.h b/include/uapi/linux/pps.h
index 009ebcd8ced5..90f2e86020ba 100644
--- a/include/uapi/linux/pps.h
+++ b/include/uapi/linux/pps.h
@@ -26,7 +26,7 @@ 
 #include <linux/types.h>
 
 #define PPS_VERSION		"5.3.6"
-#define PPS_MAX_SOURCES		16		/* should be enough... */
+#define PPS_MAX_SOURCES		MINORMASK
 
 /* Implementation note: the logical states ``assert'' and ``clear''
  * are implemented in terms of the chip register, i.e. ``assert''