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Subject[PATCH 2/4] arm64/mm: Drop task_struct argument from __do_page_fault()
Date
The task_struct argument is not getting used in __do_page_fault(). Hence
just drop it and use current or cuurent->mm instead where ever required.
This does not change any functionality.

Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
---

arch/arm64/mm/fault.c | 15 +++++----------
1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index dc1cf32..da02678 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -395,8 +395,7 @@ static void do_bad_area(unsigned long addr, unsigned int esr, struct pt_regs *re
#define VM_FAULT_BADACCESS 0x020000

static vm_fault_t __do_page_fault(struct mm_struct *mm, unsigned long addr,
- unsigned int mm_flags, unsigned long vm_flags,
- struct task_struct *tsk)
+ unsigned int mm_flags, unsigned long vm_flags)
{
struct vm_area_struct *vma;
vm_fault_t fault;
@@ -440,8 +439,7 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
struct pt_regs *regs)
{
const struct fault_info *inf;
- struct task_struct *tsk;
- struct mm_struct *mm;
+ struct mm_struct *mm = current->mm;
vm_fault_t fault, major = 0;
unsigned long vm_flags = VM_READ | VM_WRITE;
unsigned int mm_flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
@@ -449,9 +447,6 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
if (notify_page_fault(regs, esr))
return 0;

- tsk = current;
- mm = tsk->mm;
-
/*
* If we're in an interrupt or have no user context, we must not take
* the fault.
@@ -510,7 +505,7 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
#endif
}

- fault = __do_page_fault(mm, addr, mm_flags, vm_flags, tsk);
+ fault = __do_page_fault(mm, addr, mm_flags, vm_flags);
major |= fault & VM_FAULT_MAJOR;

if (fault & VM_FAULT_RETRY) {
@@ -550,11 +545,11 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
* that point.
*/
if (major) {
- tsk->maj_flt++;
+ current->maj_flt++;
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs,
addr);
} else {
- tsk->min_flt++;
+ current->min_flt++;
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs,
addr);
}
--
2.7.4
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