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Date:   Fri,  9 Oct 2020 12:50:24 -0700
From:   ira.weiny@...el.com
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Ira Weiny <ira.weiny@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        x86@...nel.org, Dave Hansen <dave.hansen@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        kvm@...r.kernel.org, netdev@...r.kernel.org, bpf@...r.kernel.org,
        kexec@...ts.infradead.org, linux-bcache@...r.kernel.org,
        linux-mtd@...ts.infradead.org, devel@...verdev.osuosl.org,
        linux-efi@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
        linux-nfs@...r.kernel.org, ceph-devel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-aio@...ck.org,
        io-uring@...r.kernel.org, linux-erofs@...ts.ozlabs.org,
        linux-um@...ts.infradead.org, linux-ntfs-dev@...ts.sourceforge.net,
        reiserfs-devel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-nilfs@...r.kernel.org, cluster-devel@...hat.com,
        ecryptfs@...r.kernel.org, linux-cifs@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-afs@...ts.infradead.org,
        linux-rdma@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        drbd-dev@...ts.linbit.com, linux-block@...r.kernel.org,
        xen-devel@...ts.xenproject.org, linux-cachefs@...hat.com,
        samba-technical@...ts.samba.org, intel-wired-lan@...ts.osuosl.org
Subject: [PATCH RFC PKS/PMEM 49/58] drivers/misc: Utilize new kmap_thread()

From: Ira Weiny <ira.weiny@...el.com>

These kmap() calls are localized to a single thread.  To avoid the over
head of global PKRS updates use the new kmap_thread() call.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 drivers/misc/vmw_vmci/vmci_queue_pair.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/misc/vmw_vmci/vmci_queue_pair.c b/drivers/misc/vmw_vmci/vmci_queue_pair.c
index 8531ae781195..f308abb8ad03 100644
--- a/drivers/misc/vmw_vmci/vmci_queue_pair.c
+++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c
@@ -343,7 +343,7 @@ static int qp_memcpy_to_queue_iter(struct vmci_queue *queue,
 		size_t to_copy;
 
 		if (kernel_if->host)
-			va = kmap(kernel_if->u.h.page[page_index]);
+			va = kmap_thread(kernel_if->u.h.page[page_index]);
 		else
 			va = kernel_if->u.g.vas[page_index + 1];
 			/* Skip header. */
@@ -357,12 +357,12 @@ static int qp_memcpy_to_queue_iter(struct vmci_queue *queue,
 		if (!copy_from_iter_full((u8 *)va + page_offset, to_copy,
 					 from)) {
 			if (kernel_if->host)
-				kunmap(kernel_if->u.h.page[page_index]);
+				kunmap_thread(kernel_if->u.h.page[page_index]);
 			return VMCI_ERROR_INVALID_ARGS;
 		}
 		bytes_copied += to_copy;
 		if (kernel_if->host)
-			kunmap(kernel_if->u.h.page[page_index]);
+			kunmap_thread(kernel_if->u.h.page[page_index]);
 	}
 
 	return VMCI_SUCCESS;
@@ -391,7 +391,7 @@ static int qp_memcpy_from_queue_iter(struct iov_iter *to,
 		int err;
 
 		if (kernel_if->host)
-			va = kmap(kernel_if->u.h.page[page_index]);
+			va = kmap_thread(kernel_if->u.h.page[page_index]);
 		else
 			va = kernel_if->u.g.vas[page_index + 1];
 			/* Skip header. */
@@ -405,12 +405,12 @@ static int qp_memcpy_from_queue_iter(struct iov_iter *to,
 		err = copy_to_iter((u8 *)va + page_offset, to_copy, to);
 		if (err != to_copy) {
 			if (kernel_if->host)
-				kunmap(kernel_if->u.h.page[page_index]);
+				kunmap_thread(kernel_if->u.h.page[page_index]);
 			return VMCI_ERROR_INVALID_ARGS;
 		}
 		bytes_copied += to_copy;
 		if (kernel_if->host)
-			kunmap(kernel_if->u.h.page[page_index]);
+			kunmap_thread(kernel_if->u.h.page[page_index]);
 	}
 
 	return VMCI_SUCCESS;
-- 
2.28.0.rc0.12.gb6a658bd00c9

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