[PATCH 13/14] mm: move arch specific VM_FAULT_* flags to mm.h

Christoph Hellwig
2018-05-16T05:43:47Z

Various architectures define their own internal flags. Not sure a public
header like mm.h is a good place, but keeping them inside the arch code
with possible conflicts also seems like a bad idea. Maybe we just need
to stop overloading the value instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/arm/mm/fault.c | 3 ---
arch/arm64/mm/fault.c | 3 ---
arch/s390/mm/fault.c | 6 ------
arch/unicore32/mm/fault.c | 3 ---
include/linux/mm.h | 7 +++++++
5 files changed, 7 insertions(+), 15 deletions(-)

diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index 32034543f49c..b696eabccf60 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -201,9 +201,6 @@ void do_bad_area(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
}

#ifdef CONFIG_MMU
-#define VM_FAULT_BADMAP 0x010000
-#define VM_FAULT_BADACCESS 0x020000
-
/*
* Check that the permissions on the VMA allow for the fault which occurred.
* If we encountered a write fault, we must have write permission, otherwise
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 91c53a7d2575..3d0b1f8eacce 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -318,9 +318,6 @@ static void do_bad_area(unsigned long addr, unsigned int esr, struct pt_regs *re
}
}

-#define VM_FAULT_BADMAP 0x010000
-#define VM_FAULT_BADACCESS 0x020000
-
static int __do_page_fault(struct mm_struct *mm, unsigned long addr,
unsigned int mm_flags, unsigned long vm_flags,
struct task_struct *tsk)
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index e074480d3598..48c781ae25d0 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -44,12 +44,6 @@
#define __SUBCODE_MASK 0x0600
#define __PF_RES_FIELD 0x8000000000000000ULL

-#define VM_FAULT_BADCONTEXT 0x010000
-#define VM_FAULT_BADMAP 0x020000
-#define VM_FAULT_BADACCESS 0x040000
-#define VM_FAULT_SIGNAL 0x080000
-#define VM_FAULT_PFAULT 0x100000
-
enum fault_type {
KERNEL_FAULT,
USER_FAULT,
diff --git a/arch/unicore32/mm/fault.c b/arch/unicore32/mm/fault.c
index 381473412937..6c3c1a82925f 100644
--- a/arch/unicore32/mm/fault.c
+++ b/arch/unicore32/mm/fault.c
@@ -148,9 +148,6 @@ void do_bad_area(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
__do_kernel_fault(mm, addr, fsr, regs);
}

-#define VM_FAULT_BADMAP 0x010000
-#define VM_FAULT_BADACCESS 0x020000
-
/*
* Check that the permissions on the VMA allow for the fault which occurred.
* If we encountered a write fault, we must have write permission, otherwise
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 338b8a1afb02..64d09e3afc24 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1250,6 +1250,13 @@ static inline void clear_page_pfmemalloc(struct page *page)
* and needs fsync() to complete (for
* synchronous page faults in DAX) */

+/* Only for use in architecture specific page fault handling: */
+#define VM_FAULT_BADMAP 0x010000
+#define VM_FAULT_BADACCESS 0x020000
+#define VM_FAULT_BADCONTEXT 0x040000
+#define VM_FAULT_SIGNAL 0x080000
+#define VM_FAULT_PFAULT 0x100000
+
#define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \
VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \
VM_FAULT_FALLBACK)
--
2.17.0