[PATCH v1 2/2] NFS: use unsigned long for req field in nfs_page_class

[Sean Chang <seanwascoding@gmail.com>]

The nfs_page_class tracepoint used a pointer for the req field. This
caused Sparse to complain about dereferencing a pointer marked as
__private within the trace ring buffer context.

Change the field type to unsigned long to store the address of the
request without dereferencing it. Update TP_printk to use 0x%lx for
consistent hexadecimal output, allowing for unique identification of
requests across the trace log.

Signed-off-by: Sean Chang <seanwascoding@gmail.com>
---
 fs/nfs/nfstrace.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/nfs/nfstrace.h b/fs/nfs/nfstrace.h
index 9f9ce4a565ea..4150bbd99cfa 100644
--- a/fs/nfs/nfstrace.h
+++ b/fs/nfs/nfstrace.h
@@ -1496,7 +1496,7 @@ DECLARE_EVENT_CLASS(nfs_page_class,
 			__field(dev_t, dev)
 			__field(u32, fhandle)
 			__field(u64, fileid)
-			__field(const struct nfs_page *__private, req)
+			__field(unsigned long, req)
 			__field(loff_t, offset)
 			__field(unsigned int, count)
 			__field(unsigned long, flags)
@@ -1509,14 +1509,14 @@ DECLARE_EVENT_CLASS(nfs_page_class,
 			__entry->dev = inode->i_sb->s_dev;
 			__entry->fileid = nfsi->fileid;
 			__entry->fhandle = nfs_fhandle_hash(&nfsi->fh);
-			__entry->req = req;
+			__entry->req = (unsigned long)req;
 			__entry->offset = req_offset(req);
 			__entry->count = req->wb_bytes;
 			__entry->flags = req->wb_flags;
 		),
 
 		TP_printk(
-			"fileid=%02x:%02x:%llu fhandle=0x%08x req=%p offset=%lld count=%u flags=%s",
+			"fileid=%02x:%02x:%llu fhandle=0x%08x req=0x%lx offset=%lld count=%u flags=%s",
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->fileid, __entry->fhandle,
 			__entry->req, __entry->offset, __entry->count,
-- 
2.34.1