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| author | Dan Williams | 2018-07-14 06:50:37 +0200 |
|---|---|---|
| committer | Dave Jiang | 2018-08-20 18:22:45 +0200 |
| commit | c953cc987ab87d180e1d5de2f1c217abe33aac77 (patch) | |
| tree | 29e82381bba655d2141bf39c261312b56d128442 /drivers/nvdimm/pmem.h | |
| parent | x86/memory_failure: Introduce {set, clear}_mce_nospec() (diff) | |
| download | kernel-qcow2-linux-c953cc987ab87d180e1d5de2f1c217abe33aac77.tar.gz kernel-qcow2-linux-c953cc987ab87d180e1d5de2f1c217abe33aac77.tar.xz kernel-qcow2-linux-c953cc987ab87d180e1d5de2f1c217abe33aac77.zip | |
libnvdimm, pmem: Restore page attributes when clearing errors
Use clear_mce_nospec() to restore WB mode for the kernel linear mapping
of a pmem page that was marked 'HWPoison'. A page with 'HWPoison' set
has also been marked UC in PAT (page attribute table) via
set_mce_nospec() to prevent speculative retrievals of poison.
The 'HWPoison' flag is only cleared when overwriting an entire page.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Diffstat (limited to 'drivers/nvdimm/pmem.h')
| -rw-r--r-- | drivers/nvdimm/pmem.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/nvdimm/pmem.h b/drivers/nvdimm/pmem.h index a64ebc78b5df..59cfe13ea8a8 100644 --- a/drivers/nvdimm/pmem.h +++ b/drivers/nvdimm/pmem.h @@ -1,6 +1,7 @@ /* SPDX-License-Identifier: GPL-2.0 */ #ifndef __NVDIMM_PMEM_H__ #define __NVDIMM_PMEM_H__ +#include <linux/page-flags.h> #include <linux/badblocks.h> #include <linux/types.h> #include <linux/pfn_t.h> @@ -27,4 +28,16 @@ struct pmem_device { long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn); + +#ifdef CONFIG_MEMORY_FAILURE +static inline bool test_and_clear_pmem_poison(struct page *page) +{ + return TestClearPageHWPoison(page); +} +#else +static inline bool test_and_clear_pmem_poison(struct page *page) +{ + return false; +} +#endif #endif /* __NVDIMM_PMEM_H__ */ |