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Storing this value will help prevent unwinders from getting out of sync with the function graph tracer ret_stack. Now instead of needing a stateful iterator, they can compare the return address pointer to find the right ret_stack entry. Note that an array of 50 ftrace_ret_stack structs is allocated for every task. So when an arch implements this, it will add either 200 or 400 bytes of memory usage per task (depending on whether it's a 32-bit or 64-bit platform). Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Byungchul Park <byungchul.park@lge.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Nilay Vaish <nilayvaish@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/a95cfcc39e8f26b89a430c56926af0bb217bc0a1.1471607358.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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| .. | ||
| cplb-mpu | ||
| cplb-nompu | ||
| .gitignore | ||
| asm-offsets.c | ||
| bfin_dma.c | ||
| bfin_gpio.c | ||
| bfin_ksyms.c | ||
| cplbinfo.c | ||
| debug-mmrs.c | ||
| dma-mapping.c | ||
| dumpstack.c | ||
| early_printk.c | ||
| entry.S | ||
| exception.c | ||
| fixed_code.S | ||
| flat.c | ||
| ftrace-entry.S | ||
| ftrace.c | ||
| gptimers.c | ||
| ipipe.c | ||
| irqchip.c | ||
| kgdb_test.c | ||
| kgdb.c | ||
| Makefile | ||
| module.c | ||
| nmi.c | ||
| perf_event.c | ||
| process.c | ||
| pseudodbg.c | ||
| ptrace.c | ||
| reboot.c | ||
| setup.c | ||
| shadow_console.c | ||
| signal.c | ||
| stacktrace.c | ||
| sys_bfin.c | ||
| time-ts.c | ||
| time.c | ||
| trace.c | ||
| traps.c | ||
| vmlinux.lds.S | ||