linux-kernel - [PATCH 1/2] include/uapi pps.h: increase PPS_MAX

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Message-Id: <20230630071826.105501-1-giometti@enneenne.com>
Date:   Fri, 30 Jun 2023 09:18:25 +0200
From:   Rodolfo Giometti <giometti@...eenne.com>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Charlie Johnston <charlie.johnston@...com>,
        Rodolfo Giometti <giometti@...eenne.com>
Subject: [PATCH 1/2] include/uapi pps.h: increase PPS_MAX_SOURCES value

From: Charlie Johnston <charlie.johnston@...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@...com>
Acked-by: Rodolfo Giometti <giometti@...eenne.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..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''
-- 
2.34.1