linux-kernel - [PATCH 4.17 159/324] tools/testing/nvdimm: advertise a write cache for nfit

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Message-Id: <20180823075004.001173976@linuxfoundation.org>
Date:   Thu, 23 Aug 2018 09:53:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vishal Verma <vishal.l.verma@...el.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.17 159/324] tools/testing/nvdimm: advertise a write cache for nfit_test

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vishal Verma <vishal.l.verma@...el.com>

[ Upstream commit 1273c253c32b9a073a4d8921ed079177ccc7c8af ]

Commit 546eb0317cfa "libnvdimm, pmem: Do not flush power-fail protected CPU caches"
fixed the write_cache detection to correctly show the lack of a write
cache based on the platform capabilities described in the ACPI NFIT. The
nfit_test unit tests expected a write cache to be present, so change the
nfit test namespaces to only advertise a persistence domain limited to
the memory controller. This allows the kernel to show a write_cache
attribute, and the test behaviour remains unchanged.

Signed-off-by: Vishal Verma <vishal.l.verma@...el.com>
Reviewed-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/testing/nvdimm/test/nfit.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/tools/testing/nvdimm/test/nfit.c
+++ b/tools/testing/nvdimm/test/nfit.c
@@ -1989,8 +1989,7 @@ static void nfit_test0_setup(struct nfit
 	pcap->header.type = ACPI_NFIT_TYPE_CAPABILITIES;
 	pcap->header.length = sizeof(*pcap);
 	pcap->highest_capability = 1;
-	pcap->capabilities = ACPI_NFIT_CAPABILITY_CACHE_FLUSH |
-		ACPI_NFIT_CAPABILITY_MEM_FLUSH;
+	pcap->capabilities = ACPI_NFIT_CAPABILITY_MEM_FLUSH;
 	offset += pcap->header.length;
 
 	if (t->setup_hotplug) {