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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a63444375f
v4.2-rc1 enabled huge page support for ioremap(..). Calling vmalloc_to_page after v4.2-rc1 results in the crash shown below on the host upon booting X100 coprocessors: BUG: unable to handle kernel paging request at ffffc47c00000000 IP: [<ffffffff811a2c0c>] vmalloc_to_page+0x6c/0xb0 This patch fixes this crash by obtaining the fake struct page pointer which is required to be passed into dma_map_sg(..) by calling pfn_to_page(..) instead of vmalloc_to_page(..). Link: https://lkml.org/lkml/2015/7/18/110 Reviewed-by: Nikhil Rao <nikhil.rao@intel.com> Suggested-by: Toshi Kani <toshi.kani@hp.com> Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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