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    Subject[PATCH 4/5] x86/fixmap: add a predicate for usermode fixmaps
    Date
    Some set of fixmaps are intented to be mapped into usermode.  Add an
    predicate to test for those fixmaps.

    Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
    ---
    arch/x86/include/asm/fixmap.h | 18 ++++++++++++++++++
    1 files changed, 18 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
    index ff3cffa..0edc2bb 100644
    --- a/arch/x86/include/asm/fixmap.h
    +++ b/arch/x86/include/asm/fixmap.h
    @@ -181,6 +181,24 @@ static inline void __set_fixmap(enum fixed_addresses idx,

    extern void __this_fixmap_does_not_exist(void);

    +static inline bool user_fixmap(enum fixed_addresses fixmap)
    +{
    + switch (fixmap) {
    +#ifdef CONFIG_X86_32
    + case FIX_HOLE ... FIX_VDSO:
    +#else
    + case VSYSCALL_LAST_PAGE ... VSYSCALL_HPET:
    +#ifdef CONFIG_PARAVIRT_CLOCK_VSYSCALL
    + case FIX_PVCLOCK_TIME_INFO:
    +#endif
    +#endif
    + return true;
    +
    + default:
    + return false;
    + }
    +}
    +
    /*
    * 'index to address' translation. If anyone tries to use the idx
    * directly without translation, we catch the bug with a NULL-deference
    --
    1.6.2.5


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