[REVIEW][PATCH 16/26] signal/arm: Remove tsk parameter from ptrace_break

From: Eric W. Biederman
Date: Wed May 22 2019 - 20:46:13 EST


The ptrace_break function is always called with tsk == current.
Make that obvious by removing the tsk parameter.

This also makes it clear that ptrace_break calls force_sig_fault
on the current task.

Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
---
arch/arm/include/asm/traps.h | 2 +-
arch/arm/kernel/ptrace.c | 6 +++---
arch/arm/kernel/traps.c | 2 +-
3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm/include/asm/traps.h b/arch/arm/include/asm/traps.h
index a00288d75ee6..172b08ff3760 100644
--- a/arch/arm/include/asm/traps.h
+++ b/arch/arm/include/asm/traps.h
@@ -30,7 +30,7 @@ static inline int __in_irqentry_text(unsigned long ptr)

extern void __init early_trap_init(void *);
extern void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long frame);
-extern void ptrace_break(struct task_struct *tsk, struct pt_regs *regs);
+extern void ptrace_break(struct pt_regs *regs);

extern void *vectors_page;

diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 6fa5b6387556..f9cbd08a9075 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -201,15 +201,15 @@ void ptrace_disable(struct task_struct *child)
/*
* Handle hitting a breakpoint.
*/
-void ptrace_break(struct task_struct *tsk, struct pt_regs *regs)
+void ptrace_break(struct pt_regs *regs)
{
force_sig_fault(SIGTRAP, TRAP_BRKPT,
- (void __user *)instruction_pointer(regs), tsk);
+ (void __user *)instruction_pointer(regs), current);
}

static int break_trap(struct pt_regs *regs, unsigned int instr)
{
- ptrace_break(current, regs);
+ ptrace_break(regs);
return 0;
}

diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 33af097c454b..288989c7355d 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -606,7 +606,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)

case NR(breakpoint): /* SWI BREAK_POINT */
regs->ARM_pc -= thumb_mode(regs) ? 2 : 4;
- ptrace_break(current, regs);
+ ptrace_break(regs);
return regs->ARM_r0;

/*
--
2.21.0