mm: fix race in kunmap_atomic()

[cascardo/linux.git] / arch / x86 / mm / highmem_32.c

diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c
index d723e36..b499626 100644 (file)
--- a/arch/x86/mm/highmem_32.c
+++ b/arch/x86/mm/highmem_32.c
@@ -74,7 +74,7 @@ void __kunmap_atomic(void *kvaddr)
            vaddr <= __fix_to_virt(FIX_KMAP_BEGIN)) {
                int idx, type;
 
-               type = kmap_atomic_idx_pop();
+               type = kmap_atomic_idx();
                idx = type + KM_TYPE_NR * smp_processor_id();
 
 #ifdef CONFIG_DEBUG_HIGHMEM
@@ -87,6 +87,7 @@ void __kunmap_atomic(void *kvaddr)
                 * attributes or becomes a protected page in a hypervisor.
                 */
                kpte_clear_flush(kmap_pte-idx, vaddr);
+               kmap_atomic_idx_pop();
        }
 #ifdef CONFIG_DEBUG_HIGHMEM
        else {