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authorJulien Grall <julien.grall@citrix.com>2015-06-19 20:05:06 +0300
committerDavid Vrabel <david.vrabel@citrix.com>2015-10-23 16:20:34 +0300
commit3922f32c1e6db2e096ff095a5b8af0b940b97508 (patch)
tree5170cad0c1b2e55c7332aeed768423e145a31952 /drivers/thunderbolt
parent008c320a96d218712043f8db0111d5472697785c (diff)
downloadlinux-3922f32c1e6db2e096ff095a5b8af0b940b97508.tar.xz
xen/grant: Add helper gnttab_page_grant_foreign_access_ref_one
Many PV drivers contain the idiom: pfn = page_to_gfn(...) /* Or similar */ gnttab_grant_foreign_access_ref Replace it by a new helper. Note that when Linux is using a different page granularity than Xen, the helper only gives access to the first 4KB grant. This is useful where drivers are allocating a full Linux page for each grant. Also include xen/interface/grant_table.h rather than xen/grant_table.h in asm/page.h for x86 to fix a compilation issue [1]. Only the former is useful in order to get the structure definition. [1] Interdependency between asm/page.h and xen/grant_table.h which result to page_mfn not being defined when necessary. Signed-off-by: Julien Grall <julien.grall@citrix.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
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