add xenomai

hc

2024-11-01 2f529f9b558ca1c1bd74be7437a84e4711743404

 kernel/mm/mprotect.c
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@@ -41,7 +41,7 @@
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 {
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 	pte_t *pte, oldpte;
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 	spinlock_t *ptl;
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-	unsigned long pages = 0;
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+	unsigned long pages = 0, flags;
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 	int target_node = NUMA_NO_NODE;
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 	bool dirty_accountable = cp_flags & MM_CP_DIRTY_ACCT;
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 	bool prot_numa = cp_flags & MM_CP_PROT_NUMA;
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@@ -113,6 +113,7 @@
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 					continue;
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 			}
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+			flags = hard_local_irq_save();
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 			oldpte = ptep_modify_prot_start(vma, addr, pte);
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 			ptent = pte_modify(oldpte, newprot);
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 			if (preserve_write)
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@@ -138,6 +139,7 @@
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 				ptent = pte_mkwrite(ptent);
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 			}
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 			ptep_modify_prot_commit(vma, addr, pte, oldpte, ptent);
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+			hard_local_irq_restore(flags);
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 			pages++;
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 		} else if (is_swap_pte(oldpte)) {
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 			swp_entry_t entry = pte_to_swp_entry(oldpte);