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tracing/function-graph-tracer: drop the kernel_text_address check 

When the function graph tracer picks a return address, it ensures this address
is really a kernel text one by calling __kernel_text_address()

Actually this path has never been taken.Its role was more likely to debug the tracer
on the beginning of its development but this function is wasteful since it is called
for every traced function.

The fault check is already sufficient.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker 2009-02-08 00:04:02 +01:00 committed by Ingo Molnar
parent 1292211058
commit 3861a17bcc
3 changed files with 3 additions and 10 deletions
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7
arch/x86/kernel/ftrace.c
View File

@ -491,13 +491,6 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr)
return; return;
} }
if (unlikely(!__kernel_text_address(old))) {
ftrace_graph_stop();
*parent = old;
WARN_ON(1);
return;
}
calltime = cpu_clock(raw_smp_processor_id()); calltime = cpu_clock(raw_smp_processor_id());
if (push_return_trace(old, calltime, if (push_return_trace(old, calltime,

4
kernel/extable.c
View File

@ -41,7 +41,7 @@ const struct exception_table_entry *search_exception_tables(unsigned long addr)
return e; return e;
} }
__notrace_funcgraph int core_kernel_text(unsigned long addr) int core_kernel_text(unsigned long addr)
{ {
if (addr >= (unsigned long)_stext && if (addr >= (unsigned long)_stext &&
addr <= (unsigned long)_etext) addr <= (unsigned long)_etext)
@ -54,7 +54,7 @@ __notrace_funcgraph int core_kernel_text(unsigned long addr)
return 0; return 0;
} }
__notrace_funcgraph int __kernel_text_address(unsigned long addr) int __kernel_text_address(unsigned long addr)
{ {
if (core_kernel_text(addr)) if (core_kernel_text(addr))
return 1; return 1;

2
kernel/module.c
View File

@ -2735,7 +2735,7 @@ int is_module_address(unsigned long addr)
/* Is this a valid kernel address? */ /* Is this a valid kernel address? */
__notrace_funcgraph struct module *__module_text_address(unsigned long addr) struct module *__module_text_address(unsigned long addr)
{ {
struct module *mod; struct module *mod;