linux-kernel - [PATCH 3/3] mm/s390: Define private VM_FAULT

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Message-Id: <20230205231704.909536-4-peterx@redhat.com>
Date:   Sun,  5 Feb 2023 18:17:04 -0500
From:   Peter Xu <peterx@...hat.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     peterx@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-s390@...r.kernel.org
Subject: [PATCH 3/3] mm/s390: Define private VM_FAULT_* reasons from top bits

The current definition already collapse with the generic definition of
vm_fault_reason.  Move the private definitions to allocate bits from the
top of uint so they won't collapse anymore.

Signed-off-by: Peter Xu <peterx@...hat.com>
---
 arch/s390/mm/fault.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 9649d9382e0a..cebfbd6dcbaf 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -46,11 +46,15 @@
 #define __SUBCODE_MASK 0x0600
 #define __PF_RES_FIELD 0x8000000000000000ULL
 
-#define VM_FAULT_BADCONTEXT	((__force vm_fault_t) 0x010000)
-#define VM_FAULT_BADMAP		((__force vm_fault_t) 0x020000)
-#define VM_FAULT_BADACCESS	((__force vm_fault_t) 0x040000)
-#define VM_FAULT_SIGNAL		((__force vm_fault_t) 0x080000)
-#define VM_FAULT_PFAULT		((__force vm_fault_t) 0x100000)
+/*
+ * Allocate private vm_fault_reason from top.  Please make sure it won't
+ * collide with vm_fault_reason.
+ */
+#define VM_FAULT_BADCONTEXT	((__force vm_fault_t) 0x80000000)
+#define VM_FAULT_BADMAP		((__force vm_fault_t) 0x40000000)
+#define VM_FAULT_BADACCESS	((__force vm_fault_t) 0x20000000)
+#define VM_FAULT_SIGNAL		((__force vm_fault_t) 0x10000000)
+#define VM_FAULT_PFAULT		((__force vm_fault_t) 0x8000000)
 
 enum fault_type {
 	KERNEL_FAULT,
-- 
2.37.3