linux-kernel - [PATCH 2/3] mm/arm64: Define private VM_FAULT

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Message-Id: <20230205231704.909536-3-peterx@redhat.com>
Date:   Sun,  5 Feb 2023 18:17:03 -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 2/3] mm/arm64: 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/arm64/mm/fault.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 596f46dabe4e..44fd16f58f94 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -480,8 +480,12 @@ static void do_bad_area(unsigned long far, unsigned long esr,
 	}
 }
 
-#define VM_FAULT_BADMAP		0x010000
-#define VM_FAULT_BADACCESS	0x020000
+/*
+ * Allocate private vm_fault_reason from top.  Please make sure it won't
+ * collide with vm_fault_reason.
+ */
+#define VM_FAULT_BADMAP		((__force vm_fault_t)0x80000000)
+#define VM_FAULT_BADACCESS	((__force vm_fault_t)0x40000000)
 
 static vm_fault_t __do_page_fault(struct mm_struct *mm, unsigned long addr,
 				  unsigned int mm_flags, unsigned long vm_flags,
-- 
2.37.3