netdev - [PATCH 2/7] RDMA/hfi1: don't pass bogus GFP_ flags to dma_alloc

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Message-Id: <20221113163535.884299-3-hch@lst.de>
Date:   Sun, 13 Nov 2022 17:35:30 +0100
From:   Christoph Hellwig <hch@....de>
To:     Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Alexandra Winter <wintera@...ux.ibm.com>,
        Wenjia Zhang <wenjia@...ux.ibm.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Russell King <linux@...linux.org.uk>,
        Robin Murphy <robin.murphy@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-rdma@...r.kernel.org,
        iommu@...ts.linux.dev, linux-media@...r.kernel.org,
        netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        alsa-devel@...a-project.org
Subject: [PATCH 2/7] RDMA/hfi1: don't pass bogus GFP_ flags to dma_alloc_coherent

dma_alloc_coherent is an opaque allocator that only uses the GFP_ flags
for allocation context control.  Don't pass GFP_USER which doesn't make
sense for a kernel DMA allocation or __GFP_COMP which makes no sense
for an allocation that can't in any way be converted to a page pointer.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/infiniband/hw/hfi1/init.c | 21 +++------------------
 1 file changed, 3 insertions(+), 18 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/init.c b/drivers/infiniband/hw/hfi1/init.c
index 436372b314312..24c0f0d257fc9 100644
--- a/drivers/infiniband/hw/hfi1/init.c
+++ b/drivers/infiniband/hw/hfi1/init.c
@@ -1761,17 +1761,11 @@ int hfi1_create_rcvhdrq(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd)
 	unsigned amt;
 
 	if (!rcd->rcvhdrq) {
-		gfp_t gfp_flags;
-
 		amt = rcvhdrq_size(rcd);
 
-		if (rcd->ctxt < dd->first_dyn_alloc_ctxt || rcd->is_vnic)
-			gfp_flags = GFP_KERNEL;
-		else
-			gfp_flags = GFP_USER;
 		rcd->rcvhdrq = dma_alloc_coherent(&dd->pcidev->dev, amt,
 						  &rcd->rcvhdrq_dma,
-						  gfp_flags | __GFP_COMP);
+						  GFP_KERNEL);
 
 		if (!rcd->rcvhdrq) {
 			dd_dev_err(dd,
@@ -1785,7 +1779,7 @@ int hfi1_create_rcvhdrq(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd)
 			rcd->rcvhdrtail_kvaddr = dma_alloc_coherent(&dd->pcidev->dev,
 								    PAGE_SIZE,
 								    &rcd->rcvhdrqtailaddr_dma,
-								    gfp_flags);
+								    GFP_KERNEL);
 			if (!rcd->rcvhdrtail_kvaddr)
 				goto bail_free;
 		}
@@ -1821,19 +1815,10 @@ int hfi1_setup_eagerbufs(struct hfi1_ctxtdata *rcd)
 {
 	struct hfi1_devdata *dd = rcd->dd;
 	u32 max_entries, egrtop, alloced_bytes = 0;
-	gfp_t gfp_flags;
 	u16 order, idx = 0;
 	int ret = 0;
 	u16 round_mtu = roundup_pow_of_two(hfi1_max_mtu);
 
-	/*
-	 * GFP_USER, but without GFP_FS, so buffer cache can be
-	 * coalesced (we hope); otherwise, even at order 4,
-	 * heavy filesystem activity makes these fail, and we can
-	 * use compound pages.
-	 */
-	gfp_flags = __GFP_RECLAIM | __GFP_IO | __GFP_COMP;
-
 	/*
 	 * The minimum size of the eager buffers is a groups of MTU-sized
 	 * buffers.
@@ -1864,7 +1849,7 @@ int hfi1_setup_eagerbufs(struct hfi1_ctxtdata *rcd)
 			dma_alloc_coherent(&dd->pcidev->dev,
 					   rcd->egrbufs.rcvtid_size,
 					   &rcd->egrbufs.buffers[idx].dma,
-					   gfp_flags);
+					   GFP_KERNEL);
 		if (rcd->egrbufs.buffers[idx].addr) {
 			rcd->egrbufs.buffers[idx].len =
 				rcd->egrbufs.rcvtid_size;
-- 
2.30.2