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authorJérôme Glisse <jglisse@redhat.com>2017-09-08 16:12:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-08 18:26:46 -0700
commitdf6ad69838fc9dcdbee0dcf2fc2c6f1113f8d609 (patch)
treed5774eba9a9c2204123b8ca36d9cba90bfa9ad64 /kernel/memremap.c
parent8315ada7f095bfa2cae0cd1e915b95bf6226897d (diff)
downloadlwn-df6ad69838fc9dcdbee0dcf2fc2c6f1113f8d609.tar.gz
lwn-df6ad69838fc9dcdbee0dcf2fc2c6f1113f8d609.zip
mm/device-public-memory: device memory cache coherent with CPU
Platform with advance system bus (like CAPI or CCIX) allow device memory to be accessible from CPU in a cache coherent fashion. Add a new type of ZONE_DEVICE to represent such memory. The use case are the same as for the un-addressable device memory but without all the corners cases. Link: http://lkml.kernel.org/r/20170817000548.32038-19-jglisse@redhat.com Signed-off-by: Jérôme Glisse <jglisse@redhat.com> Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Balbir Singh <bsingharora@gmail.com> Cc: David Nellans <dnellans@nvidia.com> Cc: Evgeny Baskakov <ebaskakov@nvidia.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Mark Hairgrove <mhairgrove@nvidia.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Sherry Cheung <SCheung@nvidia.com> Cc: Subhash Gutti <sgutti@nvidia.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Bob Liu <liubo95@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/memremap.c')
-rw-r--r--kernel/memremap.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/memremap.c b/kernel/memremap.c
index ea0e18a2a5f2..6bcbfbf1a8fd 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -501,8 +501,8 @@ struct vmem_altmap *to_vmem_altmap(unsigned long memmap_start)
#endif /* CONFIG_ZONE_DEVICE */
-#ifdef CONFIG_DEVICE_PRIVATE
-void put_zone_device_private_page(struct page *page)
+#if IS_ENABLED(CONFIG_DEVICE_PRIVATE) || IS_ENABLED(CONFIG_DEVICE_PUBLIC)
+void put_zone_device_private_or_public_page(struct page *page)
{
int count = page_ref_dec_return(page);
@@ -522,5 +522,5 @@ void put_zone_device_private_page(struct page *page)
} else if (!count)
__put_page(page);
}
-EXPORT_SYMBOL(put_zone_device_private_page);
-#endif /* CONFIG_DEVICE_PRIVATE */
+EXPORT_SYMBOL(put_zone_device_private_or_public_page);
+#endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */