xen: introduce helper functions to do safe read and write accesses

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Introduce two helper functions to safely read and write unsigned long
values from or to memory when the access may fault because the mapping
is non-present or read-only.

These helpers can be used instead of open coded uses of __get_user()
and __put_user() avoiding the need to do casts to fix sparse warnings.

Use the helpers in page.h and p2m.c. This will fix the sparse
warnings when doing "make C=1".

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

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Juergen Gross 2014-12-05 13:28:04 +01:00 • committed by David Vrabel

parent 2e917175e1

commit 90fff3ea15

2 changed files with 16 additions and 2 deletions

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16

arch/x86/include/asm/xen/page.h

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2

arch/x86/xen/p2m.c

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