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authorJuergen Gross <jgross@suse.com>2022-05-30 11:26:34 +0300
committerJuergen Gross <jgross@suse.com>2022-06-01 08:24:17 +0300
commit41925b105e345ebc84cedb64f59d20cb14a62613 (patch)
treedb46827005d233292fc714cc01b80d62edb43d55 /MAINTAINERS
parent0a19bab54ef44348aa5edfc2b8ff47f63a45ae15 (diff)
downloadlinux-41925b105e345ebc84cedb64f59d20cb14a62613.tar.xz
xen: replace xen_remap() with memremap()
xen_remap() is used to establish mappings for frames not under direct control of the kernel: for Xenstore and console ring pages, and for grant pages of non-PV guests. Today xen_remap() is defined to use ioremap() on x86 (doing uncached mappings), and ioremap_cache() on Arm (doing cached mappings). Uncached mappings for those use cases are bad for performance, so they should be avoided if possible. As all use cases of xen_remap() don't require uncached mappings (the mapped area is always physical RAM), a mapping using the standard WB cache mode is fine. As sparse is flagging some of the xen_remap() use cases to be not appropriate for iomem(), as the result is not annotated with the __iomem modifier, eliminate xen_remap() completely and replace all use cases with memremap() specifying the MEMREMAP_WB caching mode. xen_unmap() can be replaced with memunmap(). Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Acked-by: Stefano Stabellini <sstabellini@kernel.org> Link: https://lore.kernel.org/r/20220530082634.6339-1-jgross@suse.com Signed-off-by: Juergen Gross <jgross@suse.com>
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