linux-kernel - [RFC PATCH] pps: Increase PPS_MAX

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Date:   Mon,  5 Jun 2023 15:31:47 -0500
From:   Charlie Johnston <charlie.johnston@...com>
To:     giometti@...eenne.com
Cc:     linux-kernel@...r.kernel.org, brenda.streiff@...com,
        Charlie Johnston <charlie.johnston@...com>
Subject: [RFC PATCH] pps: Increase PPS_MAX_SOURCES value.

For consistency with what ptp uses for minors, this
change sets PPS_MAX_SOURCES to MINORMASK + 1.

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@...com>
---
 include/uapi/linux/pps.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/pps.h b/include/uapi/linux/pps.h
index 009ebcd8ced5..85f472330da8 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 + 1)
 
 /* Implementation note: the logical states ``assert'' and ``clear''
  * are implemented in terms of the chip register, i.e. ``assert''
-- 
2.30.2