On Fri, Feb 27, 2015 at 4:29 PM, Denys Vlasenko <[email protected]> wrote: > Internally, lockdep_sys_exit_thunk saves callee-clobbered registers, > and calls a C function, lockdep_sys_exix. Thus, callee-preserved > won't be mangled, there is no need to save them. > > Patch was run-tested.
Peterz, I think this was your code. --Andy > > Signed-off-by: Denys Vlasenko <[email protected]> > CC: Linus Torvalds <[email protected]> > CC: Steven Rostedt <[email protected]> > CC: Ingo Molnar <[email protected]> > CC: Borislav Petkov <[email protected]> > CC: "H. Peter Anvin" <[email protected]> > CC: Andy Lutomirski <[email protected]> > CC: Oleg Nesterov <[email protected]> > CC: Frederic Weisbecker <[email protected]> > CC: Alexei Starovoitov <[email protected]> > CC: Will Drewry <[email protected]> > CC: Kees Cook <[email protected]> > CC: [email protected] > CC: [email protected] > --- > arch/x86/include/asm/irqflags.h | 2 -- > 1 file changed, 2 deletions(-) > > diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h > index 19355f3..9a63eae 100644 > --- a/arch/x86/include/asm/irqflags.h > +++ b/arch/x86/include/asm/irqflags.h > @@ -179,9 +179,7 @@ static inline int arch_irqs_disabled(void) > # define LOCKDEP_SYS_EXIT_IRQ \ > TRACE_IRQS_ON; \ > sti; \ > - SAVE_EXTRA_REGS; \ > call lockdep_sys_exit_thunk; \ > - RESTORE_EXTRA_REGS; \ > cli; \ > TRACE_IRQS_OFF; > # else > -- > 1.8.1.4 > -- Andy Lutomirski AMA Capital Management, LLC -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
