From ab1b6f03a10ba1f5638188ab06bf46e33ac3a160 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 8 May 2007 00:23:29 -0700 Subject: [PATCH] simplify the stacktrace code Simplify the stacktrace code: - remove the unused task argument to save_stack_trace, it's always current - remove the all_contexts flag, it's alwasy 0 Signed-off-by: Christoph Hellwig Cc: Paul Mundt Cc: Ralf Baechle Cc: Martin Schwidefsky Cc: "David S. Miller" Cc: Andi Kleen Cc: Akinobu Mita Acked-by: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/mips/kernel/stacktrace.c | 22 ++++++---------------- arch/s390/kernel/stacktrace.c | 18 +++++++----------- arch/sh/kernel/stacktrace.c | 9 +-------- arch/sparc64/kernel/stacktrace.c | 20 +++++++------------- arch/x86_64/kernel/stacktrace.c | 8 +++----- include/linux/stacktrace.h | 6 ++---- kernel/lockdep.c | 3 +-- lib/fault-inject.c | 3 +-- 8 files changed, 28 insertions(+), 61 deletions(-) diff --git a/arch/mips/kernel/stacktrace.c b/arch/mips/kernel/stacktrace.c index a586aba337a7..ebd9db8d1ece 100644 --- a/arch/mips/kernel/stacktrace.c +++ b/arch/mips/kernel/stacktrace.c @@ -31,8 +31,7 @@ static void save_raw_context_stack(struct stack_trace *trace, } } -static void save_context_stack(struct stack_trace *trace, - struct task_struct *task, struct pt_regs *regs) +static void save_context_stack(struct stack_trace *trace, struct pt_regs *regs) { unsigned long sp = regs->regs[29]; #ifdef CONFIG_KALLSYMS @@ -41,7 +40,7 @@ static void save_context_stack(struct stack_trace *trace, if (raw_show_trace || !__kernel_text_address(pc)) { unsigned long stack_page = - (unsigned long)task_stack_page(task); + (unsigned long)task_stack_page(current); if (stack_page && sp >= stack_page && sp <= stack_page + THREAD_SIZE - 32) save_raw_context_stack(trace, sp); @@ -54,7 +53,7 @@ static void save_context_stack(struct stack_trace *trace, trace->entries[trace->nr_entries++] = pc; if (trace->nr_entries >= trace->max_entries) break; - pc = unwind_stack(task, &sp, pc, &ra); + pc = unwind_stack(current, &sp, pc, &ra); } while (pc); #else save_raw_context_stack(trace, sp); @@ -64,22 +63,13 @@ static void save_context_stack(struct stack_trace *trace, /* * Save stack-backtrace addresses into a stack_trace buffer. */ -void save_stack_trace(struct stack_trace *trace, struct task_struct *task) +void save_stack_trace(struct stack_trace *trace) { struct pt_regs dummyregs; struct pt_regs *regs = &dummyregs; WARN_ON(trace->nr_entries || !trace->max_entries); - if (task && task != current) { - regs->regs[29] = task->thread.reg29; - regs->regs[31] = 0; - regs->cp0_epc = task->thread.reg31; - } else { - if (!task) - task = current; - prepare_frametrace(regs); - } - - save_context_stack(trace, task, regs); + prepare_frametrace(regs); + save_context_stack(trace, regs); } diff --git a/arch/s390/kernel/stacktrace.c b/arch/s390/kernel/stacktrace.c index 2e5c65a1863e..515ff9011dd7 100644 --- a/arch/s390/kernel/stacktrace.c +++ b/arch/s390/kernel/stacktrace.c @@ -59,7 +59,7 @@ static unsigned long save_context_stack(struct stack_trace *trace, } } -void save_stack_trace(struct stack_trace *trace, struct task_struct *task) +void save_stack_trace(struct stack_trace *trace) { register unsigned long sp asm ("15"); unsigned long orig_sp, new_sp; @@ -69,20 +69,16 @@ void save_stack_trace(struct stack_trace *trace, struct task_struct *task) new_sp = save_context_stack(trace, &trace->skip, orig_sp, S390_lowcore.panic_stack - PAGE_SIZE, S390_lowcore.panic_stack); - if ((new_sp != orig_sp) && !trace->all_contexts) + if (new_sp != orig_sp) return; new_sp = save_context_stack(trace, &trace->skip, new_sp, S390_lowcore.async_stack - ASYNC_SIZE, S390_lowcore.async_stack); - if ((new_sp != orig_sp) && !trace->all_contexts) + if (new_sp != orig_sp) return; - if (task) - save_context_stack(trace, &trace->skip, new_sp, - (unsigned long) task_stack_page(task), - (unsigned long) task_stack_page(task) + THREAD_SIZE); - else - save_context_stack(trace, &trace->skip, new_sp, - S390_lowcore.thread_info, - S390_lowcore.thread_info + THREAD_SIZE); + + save_context_stack(trace, &trace->skip, new_sp, + S390_lowcore.thread_info, + S390_lowcore.thread_info + THREAD_SIZE); return; } diff --git a/arch/sh/kernel/stacktrace.c b/arch/sh/kernel/stacktrace.c index 0d5268afe80f..4bdd2f83535d 100644 --- a/arch/sh/kernel/stacktrace.c +++ b/arch/sh/kernel/stacktrace.c @@ -19,14 +19,7 @@ */ void save_stack_trace(struct stack_trace *trace, struct task_struct *task) { - unsigned long *sp; - - if (!task) - task = current; - if (task == current) - sp = (unsigned long *)current_stack_pointer; - else - sp = (unsigned long *)task->thread.sp; + unsigned long *sp = (unsigned long *)current_stack_pointer; while (!kstack_end(sp)) { unsigned long addr = *sp++; diff --git a/arch/sparc64/kernel/stacktrace.c b/arch/sparc64/kernel/stacktrace.c index c4d15f2762b9..47f92a59be18 100644 --- a/arch/sparc64/kernel/stacktrace.c +++ b/arch/sparc64/kernel/stacktrace.c @@ -3,22 +3,16 @@ #include #include -void save_stack_trace(struct stack_trace *trace, struct task_struct *task) +void save_stack_trace(struct stack_trace *trace) { unsigned long ksp, fp, thread_base; - struct thread_info *tp; + struct thread_info *tp = task_thread_info(current); - if (!task) - task = current; - tp = task_thread_info(task); - if (task == current) { - flushw_all(); - __asm__ __volatile__( - "mov %%fp, %0" - : "=r" (ksp) - ); - } else - ksp = tp->ksp; + flushw_all(); + __asm__ __volatile__( + "mov %%fp, %0" + : "=r" (ksp) + ); fp = ksp + STACK_BIAS; thread_base = (unsigned long) tp; diff --git a/arch/x86_64/kernel/stacktrace.c b/arch/x86_64/kernel/stacktrace.c index 65ac2c6b34a6..cb9109113584 100644 --- a/arch/x86_64/kernel/stacktrace.c +++ b/arch/x86_64/kernel/stacktrace.c @@ -21,8 +21,7 @@ save_stack_warning_symbol(void *data, char *msg, unsigned long symbol) static int save_stack_stack(void *data, char *name) { - struct stack_trace *trace = (struct stack_trace *)data; - return trace->all_contexts ? 0 : -1; + return -1; } static void save_stack_address(void *data, unsigned long addr) @@ -46,11 +45,10 @@ static struct stacktrace_ops save_stack_ops = { /* * Save stack-backtrace addresses into a stack_trace buffer. */ -void save_stack_trace(struct stack_trace *trace, struct task_struct *task) +void save_stack_trace(struct stack_trace *trace) { - dump_trace(task, NULL, NULL, &save_stack_ops, trace); + dump_trace(current, NULL, NULL, &save_stack_ops, trace); if (trace->nr_entries < trace->max_entries) trace->entries[trace->nr_entries++] = ULONG_MAX; } EXPORT_SYMBOL(save_stack_trace); - diff --git a/include/linux/stacktrace.h b/include/linux/stacktrace.h index 50e2b01e517c..1d2b084c0185 100644 --- a/include/linux/stacktrace.h +++ b/include/linux/stacktrace.h @@ -6,15 +6,13 @@ struct stack_trace { unsigned int nr_entries, max_entries; unsigned long *entries; int skip; /* input argument: How many entries to skip */ - int all_contexts; /* input argument: if true do than one stack */ }; -extern void save_stack_trace(struct stack_trace *trace, - struct task_struct *task); +extern void save_stack_trace(struct stack_trace *trace); extern void print_stack_trace(struct stack_trace *trace, int spaces); #else -# define save_stack_trace(trace, task) do { } while (0) +# define save_stack_trace(trace) do { } while (0) # define print_stack_trace(trace) do { } while (0) #endif diff --git a/kernel/lockdep.c b/kernel/lockdep.c index 7065a687ac54..c1e308a080b8 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -257,9 +257,8 @@ static int save_trace(struct stack_trace *trace) trace->entries = stack_trace + nr_stack_trace_entries; trace->skip = 3; - trace->all_contexts = 0; - save_stack_trace(trace, NULL); + save_stack_trace(trace); trace->max_entries = trace->nr_entries; diff --git a/lib/fault-inject.c b/lib/fault-inject.c index 0fabd12c39d7..b18fc2ff9ffe 100644 --- a/lib/fault-inject.c +++ b/lib/fault-inject.c @@ -72,9 +72,8 @@ static bool fail_stacktrace(struct fault_attr *attr) trace.entries = entries; trace.max_entries = depth; trace.skip = 1; - trace.all_contexts = 0; - save_stack_trace(&trace, NULL); + save_stack_trace(&trace); for (n = 0; n < trace.nr_entries; n++) { if (attr->reject_start <= entries[n] && entries[n] < attr->reject_end)