AuxXxilium/linux_dsm_epyc7002
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Merge branches 'tracing/ftrace' and 'tracing/hw-branch-tracing' into tracing/core

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This commit is contained in:
Ingo Molnar 2008-12-18 12:51:05 +01:00
commit 40874491f9
1 changed files with 31 additions and 36 deletions
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67
arch/x86/kernel/ds.c
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@ -232,54 +232,46 @@ static DEFINE_PER_CPU(struct ds_context *, system_context_array);
#define system_context per_cpu(system_context_array, smp_processor_id())
static struct ds_context *ds_get_context(struct task_struct *task)
static inline struct ds_context *ds_get_context(struct task_struct *task)
{
struct ds_context **p_context =
(task ? &task->thread.ds_ctx : &system_context);
struct ds_context *context = *p_context;
struct ds_context *context = NULL;
struct ds_context *new_context = NULL;
unsigned long irq;
/* Chances are small that we already have a context. */
new_context = kzalloc(sizeof(*new_context), GFP_KERNEL);
if (!new_context)
return NULL;
spin_lock_irqsave(&ds_lock, irq);
context = *p_context;
if (!context) {
context = kzalloc(sizeof(*context), GFP_KERNEL);
if (!context)
return NULL;
context = new_context;
spin_lock_irqsave(&ds_lock, irq);
context->this = p_context;
context->task = task;
context->count = 0;
if (*p_context) {
kfree(context);
if (task)
set_tsk_thread_flag(task, TIF_DS_AREA_MSR);
context = *p_context;
} else {
*p_context = context;
if (!task || (task == current))
wrmsrl(MSR_IA32_DS_AREA, (unsigned long)context->ds);
context->this = p_context;
context->task = task;
if (task)
set_tsk_thread_flag(task, TIF_DS_AREA_MSR);
if (!task || (task == current))
wrmsrl(MSR_IA32_DS_AREA,
(unsigned long)context->ds);
}
context->count++;
spin_unlock_irqrestore(&ds_lock, irq);
} else {
spin_lock_irqsave(&ds_lock, irq);
context = *p_context;
if (context)
context->count++;
spin_unlock_irqrestore(&ds_lock, irq);
if (!context)
context = ds_get_context(task);
*p_context = context;
}
context->count++;
spin_unlock_irqrestore(&ds_lock, irq);
if (context != new_context)
kfree(new_context);
return context;
}
@ -492,6 +484,9 @@ static int bts_read(struct bts_tracer *tracer, const void *at,
out->qualifier = bts_branch;
out->variant.lbr.from = bts_get(at, bts_from);
out->variant.lbr.to = bts_get(at, bts_to);
if (!out->variant.lbr.from && !out->variant.lbr.to)
out->qualifier = bts_invalid;
}
return ds_cfg.sizeof_rec[ds_bts];