From: Peter Xu <peterx@redhat.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: peterx@redhat.com, Andrew Morton <akpm@linux-foundation.org>,
linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org
Subject: [PATCH 2/3] mm/arm64: Define private VM_FAULT_* reasons from top bits
Date: Sun, 5 Feb 2023 18:17:03 -0500 [thread overview]
Message-ID: <20230205231704.909536-3-peterx@redhat.com> (raw)
In-Reply-To: <20230205231704.909536-1-peterx@redhat.com>
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@redhat.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
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next prev parent reply other threads:[~2023-02-05 23:18 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-05 23:17 [PATCH 0/3] mm/arch: Fix a few collide definition on private use of VM_FAULT_* Peter Xu
2023-02-05 23:17 ` [PATCH 1/3] mm/arm: Define private VM_FAULT_* reasons from top bits Peter Xu
2023-02-05 23:17 ` Peter Xu [this message]
2023-02-05 23:17 ` [PATCH 3/3] mm/s390: " Peter Xu
2023-02-09 20:10 ` Heiko Carstens
2023-02-06 0:10 ` [PATCH 0/3] mm/arch: Fix a few collide definition on private use of VM_FAULT_* Matthew Wilcox
2023-02-06 0:54 ` Peter Xu
2023-02-06 2:51 ` Matthew Wilcox
2023-02-06 3:18 ` Peter Xu
2023-02-06 5:09 ` Matthew Wilcox
2023-02-09 20:04 ` Heiko Carstens
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