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authorLinus Torvalds <torvalds@linux-foundation.org>2018-02-06 10:41:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-06 10:41:33 -0800
commit3ff1b28caaff1d66d2be7e6eb7c56f78e9046fbb (patch)
tree32d75a6db7f4985d37a9cfb7f1a1270963cfa404 /mm/gup.c
parent105cf3c8c6264dce4bcdab877feb8037bc4109b1 (diff)
parentee95f4059a833839bf52972191b2d4c3d3cec552 (diff)
Merge tag 'libnvdimm-for-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull libnvdimm updates from Ross Zwisler: - Require struct page by default for filesystem DAX to remove a number of surprising failure cases. This includes failures with direct I/O, gdb and fork(2). - Add support for the new Platform Capabilities Structure added to the NFIT in ACPI 6.2a. This new table tells us whether the platform supports flushing of CPU and memory controller caches on unexpected power loss events. - Revamp vmem_altmap and dev_pagemap handling to clean up code and better support future future PCI P2P uses. - Deprecate the ND_IOCTL_SMART_THRESHOLD command whose payload has become out-of-sync with recent versions of the NVDIMM_FAMILY_INTEL spec, and instead rely on the generic ND_CMD_CALL approach used by the two other IOCTL families, NVDIMM_FAMILY_{HPE,MSFT}. - Enhance nfit_test so we can test some of the new things added in version 1.6 of the DSM specification. This includes testing firmware download and simulating the Last Shutdown State (LSS) status. * tag 'libnvdimm-for-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: (37 commits) libnvdimm, namespace: remove redundant initialization of 'nd_mapping' acpi, nfit: fix register dimm error handling libnvdimm, namespace: make min namespace size 4K tools/testing/nvdimm: force nfit_test to depend on instrumented modules libnvdimm/nfit_test: adding support for unit testing enable LSS status libnvdimm/nfit_test: add firmware download emulation nfit-test: Add platform cap support from ACPI 6.2a to test libnvdimm: expose platform persistence attribute for nd_region acpi: nfit: add persistent memory control flag for nd_region acpi: nfit: Add support for detect platform CPU cache flush on power loss device-dax: Fix trailing semicolon libnvdimm, btt: fix uninitialized err_lock dax: require 'struct page' by default for filesystem dax ext2: auto disable dax instead of failing mount ext4: auto disable dax instead of failing mount mm, dax: introduce pfn_t_special() mm: Fix devm_memremap_pages() collision handling mm: Fix memory size alignment in devm_memremap_pages_release() memremap: merge find_dev_pagemap into get_dev_pagemap memremap: change devm_memremap_pages interface to use struct dev_pagemap ...
Diffstat (limited to 'mm/gup.c')
-rw-r--r--mm/gup.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/mm/gup.c b/mm/gup.c
index 9e17d8db2d6b..1b46e6e74881 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1394,7 +1394,6 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
VM_BUG_ON_PAGE(compound_head(page) != head, page);
- put_dev_pagemap(pgmap);
SetPageReferenced(page);
pages[*nr] = page;
(*nr)++;
@@ -1404,6 +1403,8 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
ret = 1;
pte_unmap:
+ if (pgmap)
+ put_dev_pagemap(pgmap);
pte_unmap(ptem);
return ret;
}
@@ -1443,10 +1444,12 @@ static int __gup_device_huge(unsigned long pfn, unsigned long addr,
SetPageReferenced(page);
pages[*nr] = page;
get_page(page);
- put_dev_pagemap(pgmap);
(*nr)++;
pfn++;
} while (addr += PAGE_SIZE, addr != end);
+
+ if (pgmap)
+ put_dev_pagemap(pgmap);
return 1;
}