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tracing: make CALLER_ADDRx overwriteable
The current definition of CALLER_ADDRx isn't suitable for all platforms. E.g. for ARM __builtin_return_address(N) doesn't work for N > 0 and AFAIK for powerpc there are no frame pointers needed to have a working __builtin_return_address. This patch allows defining the CALLER_ADDRx macros in <asm/ftrace.h> and let these take precedence. Because now <asm/ftrace.h> is included unconditionally in <linux/ftrace.h> all archs that don't already had this include get an empty one for free. Signed-off-by: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@elte.hu> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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arch/alpha/include/asm/ftrace.h
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arch/alpha/include/asm/ftrace.h
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/* empty */
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arch/avr32/include/asm/ftrace.h
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arch/avr32/include/asm/ftrace.h
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/* empty */
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arch/blackfin/include/asm/ftrace.h
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arch/blackfin/include/asm/ftrace.h
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/* empty */
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arch/cris/include/asm/ftrace.h
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arch/cris/include/asm/ftrace.h
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/* empty */
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arch/h8300/include/asm/ftrace.h
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arch/h8300/include/asm/ftrace.h
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/* empty */
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arch/m68k/include/asm/ftrace.h
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arch/m68k/include/asm/ftrace.h
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/* empty */
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arch/mips/include/asm/ftrace.h
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arch/mips/include/asm/ftrace.h
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/* empty */
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arch/parisc/include/asm/ftrace.h
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arch/parisc/include/asm/ftrace.h
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/* empty */
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arch/um/include/asm/ftrace.h
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arch/um/include/asm/ftrace.h
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/* empty */
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arch/xtensa/include/asm/ftrace.h
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arch/xtensa/include/asm/ftrace.h
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/* empty */
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include/asm-frv/ftrace.h
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include/asm-frv/ftrace.h
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@ -0,0 +1 @@
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/* empty */
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include/asm-m32r/ftrace.h
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include/asm-m32r/ftrace.h
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@ -0,0 +1 @@
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/* empty */
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include/asm-mn10300/ftrace.h
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include/asm-mn10300/ftrace.h
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/* empty */
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@ -11,6 +11,8 @@
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#include <linux/bitops.h>
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#include <linux/sched.h>
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#include <asm/ftrace.h>
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#ifdef CONFIG_FUNCTION_TRACER
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extern int ftrace_enabled;
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@ -103,8 +105,6 @@ struct ftrace_func_command {
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};
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#ifdef CONFIG_DYNAMIC_FTRACE
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/* asm/ftrace.h must be defined for archs supporting dynamic ftrace */
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#include <asm/ftrace.h>
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int ftrace_arch_code_modify_prepare(void);
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int ftrace_arch_code_modify_post_process(void);
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@ -282,24 +282,25 @@ static inline void __ftrace_enabled_restore(int enabled)
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#endif
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}
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#ifdef CONFIG_FRAME_POINTER
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/* TODO: need to fix this for ARM */
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# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
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# define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
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# define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
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# define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
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# define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
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# define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
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# define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
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#else
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# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
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# define CALLER_ADDR1 0UL
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# define CALLER_ADDR2 0UL
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# define CALLER_ADDR3 0UL
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# define CALLER_ADDR4 0UL
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# define CALLER_ADDR5 0UL
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# define CALLER_ADDR6 0UL
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#endif
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#ifndef HAVE_ARCH_CALLER_ADDR
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# ifdef CONFIG_FRAME_POINTER
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# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
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# define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
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# define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
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# define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
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# define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
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# define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
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# define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
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# else
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# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
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# define CALLER_ADDR1 0UL
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# define CALLER_ADDR2 0UL
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# define CALLER_ADDR3 0UL
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# define CALLER_ADDR4 0UL
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# define CALLER_ADDR5 0UL
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# define CALLER_ADDR6 0UL
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# endif
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#endif /* ifndef HAVE_ARCH_CALLER_ADDR */
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#ifdef CONFIG_IRQSOFF_TRACER
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extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
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