These seem to be required too. Mostly for optimizations the compiler can provide. Seem to be supported in gnu. __builtin_clz __builtin_constant_p __builtin_expect __builtin_frame_address http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0376a/Caceiddh.html 2009/5/13 Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>: > This saves the function overhead for CALLER_ADDRESS0. > > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx> > Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > --- > Hi Thomas, > > this applies to .29.3-rt12. Feel free to squash this into > arm-tracing-updates.patch. > > Best regards > Uwe > > arch/arm/include/asm/ftrace.h | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > diff --git a/arch/arm/include/asm/ftrace.h b/arch/arm/include/asm/ftrace.h > index 900fc19..f7e8bac 100644 > --- a/arch/arm/include/asm/ftrace.h > +++ b/arch/arm/include/asm/ftrace.h > @@ -15,7 +15,7 @@ extern void mcount(void); > void *return_address(unsigned int); > > #define HAVE_ARCH_CALLER_ADDR > -#define CALLER_ADDR0 ((unsigned long)return_address(0)) > +#define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) > #define CALLER_ADDR1 ((unsigned long)return_address(1)) > #define CALLER_ADDR2 ((unsigned long)return_address(2)) > #define CALLER_ADDR3 ((unsigned long)return_address(3)) > -- > 1.6.2.1 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- -- Sujit K M -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
