[PATCH 6.1.y 4/5] SUNRPC: Update svcxdr_init_decode() to call xdr_set_scratch_folio()

[Sasha Levin <sashal@kernel.org>]

From: Anna Schumaker <anna.schumaker@oracle.com>

[ Upstream commit d57e43b72bf2071caac90da323849c3983a695f0 ]

The only snag here is that __folio_alloc_node() doesn't handle
NUMA_NO_NODE, so I also need to update svc_pool_map_get_node() to return
numa_mem_id() instead. I arrived at this approach by  looking at what
other users of __folio_alloc_node() do for this case.

Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>

[ Stable backport note: Earlier dependencies already converted rq_scratch_page
  to rq_scratch_folio, including allocation and release. Keep those changes
  and switch svcxdr_init_decode() to the xdr_set_scratch_folio() helper added
  by the immediately preceding dependency.

  Drop the svc_pool_map_get_node() change: svc_rqst_alloc() already converts
  NUMA_NO_NODE to numa_mem_id() before __folio_alloc_node(). Preserve that
  fallback and the existing pool/thread placement policy.

  The resulting dependency changes only the existing decoder helper call;
  no functions are added. The scratch-folio release and surrounding context
  required by c479bde671cb are retained, and its patch applies cleanly. ]

[ sashal: Reduced backport -- upstream d57e43b72bf20 touches 2 file(s), this
  backport carries 1. Not backported here:
  net/sunrpc/svc.c
  This note is generated from the file lists only; see the resolution record
  for the reasoning. ]

Stable-dep-of: c479bde671cb ("sunrpc: defer rq_argp and rq_resp free until after RCU grace period")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 include/linux/sunrpc/svc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 4144a256fc255..40ab44b993cf9 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -545,7 +545,7 @@ static inline void svcxdr_init_decode(struct svc_rqst *rqstp)
 	buf->len = buf->head->iov_len + buf->page_len + buf->tail->iov_len;
 
 	xdr_init_decode(xdr, buf, argv->iov_base, NULL);
-	xdr_set_scratch_page(xdr, folio_page(rqstp->rq_scratch_folio, 0));
+	xdr_set_scratch_folio(xdr, rqstp->rq_scratch_folio);
 }
 
 /**
-- 
2.53.0