diff options
| author | Jérôme Glisse <[email protected]> | 2017-09-08 16:12:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2017-09-08 18:26:46 -0700 |
| commit | df6ad69838fc9dcdbee0dcf2fc2c6f1113f8d609 (patch) | |
| tree | d5774eba9a9c2204123b8ca36d9cba90bfa9ad64 /kernel | |
| parent | 8315ada7f095bfa2cae0cd1e915b95bf6226897d (diff) | |
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/[email protected]
Signed-off-by: Jérôme Glisse <[email protected]>
Cc: Aneesh Kumar <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Ross Zwisler <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: David Nellans <[email protected]>
Cc: Evgeny Baskakov <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: John Hubbard <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Mark Hairgrove <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Sherry Cheung <[email protected]>
Cc: Subhash Gutti <[email protected]>
Cc: Vladimir Davydov <[email protected]>
Cc: Bob Liu <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/memremap.c | 8 |
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 */ |