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x86/paravirt: remove lazy mode in interrupts

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Impact: simplification, robustness

Make paravirt_lazy_mode() always return PARAVIRT_LAZY_NONE
when in an interrupt.  This prevents interrupt code from
accidentally inheriting an outer lazy state, and instead
does everything synchronously.  Outer batched operations
are left deferred.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jeremy Fitzhardinge
2009-02-17 23:05:19 -08:00
parent a8a93f3f03
commit b8bcfe997e
5 changed files with 5 additions and 21 deletions
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2
arch/x86/mm/highmem_32.c
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@@ -87,7 +87,6 @@ void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot)
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
BUG_ON(!pte_none(*(kmap_pte-idx)));
set_pte(kmap_pte-idx, mk_pte(page, prot));
arch_flush_lazy_mmu_mode();
return (void *)vaddr;
}
@@ -117,7 +116,6 @@ void kunmap_atomic(void *kvaddr, enum km_type type)
#endif
}
arch_flush_lazy_mmu_mode();
pagefault_enable();
}