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authorMax Filippov <jcmvbkbc@gmail.com>2014-07-21 14:54:11 (GMT)
committerMax Filippov <jcmvbkbc@gmail.com>2014-08-14 07:59:20 (GMT)
commita91902db2990909ea5e6b110811b448f2e8f1571 (patch)
tree133c118a40292c1c4480acaaa1df1add1b70eaf0 /REPORTING-BUGS
parent7128039fe2dd3d59da9e4ffa036f3aaa3ba87b9f (diff)
downloadlinux-a91902db2990909ea5e6b110811b448f2e8f1571.tar.xz
xtensa: implement clear_user_highpage and copy_user_highpage
Existing clear_user_page and copy_user_page cannot be used with highmem because they calculate physical page address from its virtual address and do it incorrectly in case of high memory page mapped with kmap_atomic. Also kmap is not needed, as most likely userspace mapping color would be different from the kmapped color. Provide clear_user_highpage and copy_user_highpage functions that determine if temporary mapping is needed for the pages. Move most of the logic of the former clear_user_page and copy_user_page to xtensa/mm/cache.c only leaving temporary mapping setup, invalidation and clearing/copying in the xtensa/mm/misc.S. Rename these functions to clear_page_alias and copy_page_alias. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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