[PATCH v7 13/15] net: qrtr: limit endpoint range to 16 bits on 32-bit machines

[Juha-Matti Tilli]

On 64-bit machines, use the full range for endpoint ids, but on 32-bit
machines, use only 16 bits. This gives plenty of endpoints, 65534 to
be specific, apart from the invalid zero value and the local endpoint.

This should fix any issues where a long-running system with lots of
allocations might allocate an endpoint id bigger than 65535 on a 32-bit
system. The node id, the secondary part, is already combined with port
id into a value that is potentially 32 bits in existing old code.

NOTE: this commit is a candidate for squashing with the two next
commits, if we want to have the "radix tree of trees" approach. This
note should probably be removed before committing. If we don't want
"radix tree of trees", this commit needs careful decision of whether we
may want to drop it.

Signed-off-by: Juha-Matti Tilli <juha-matti.tilli@xxxxxx>
---
 net/qrtr/af_qrtr.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/qrtr/af_qrtr.c b/net/qrtr/af_qrtr.c
index b27c5a659795d..3c84da3059a80 100644
--- a/net/qrtr/af_qrtr.c
+++ b/net/qrtr/af_qrtr.c
@@ -22,7 +22,11 @@
 #define QRTR_MAX_EPH_SOCKET 0x7fff
 #define QRTR_EPH_PORT_RANGE \
 		XA_LIMIT(QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET)
+#if BITS_PER_LONG >= 64
 #define QRTR_ENDPOINT_RANGE XA_LIMIT(qrtr_local_nid + 1, INT_MAX)
+#else
+#define QRTR_ENDPOINT_RANGE XA_LIMIT(qrtr_local_nid + 1, USHRT_MAX)
+#endif
 
 #define QRTR_PORT_CTRL_LEGACY 0xffff
 
-- 
2.34.1