[PATCH] powerpc/xmon: Exclude all of xmon/ from ftrace
From: Naveen N. Rao <hidden>
Date: 2017-08-02 18:25:53
Exclude core xmon files from ftrace (along with an xmon xive helper outside of xmon/) to minimize impact of ftrace while within xmon. Before patch: root@ubuntu:/sys/kernel/debug/tracing# cat available_filter_functions | grep -i xmon xmon_xive_do_dump xmon_dbgfs_get xmon_print_symbol xmon_show_stack xmon_dbgfs_ops_open xmon_init.part.2 xmon_dbgfs_set sysrq_handle_xmon xmon_fault_handler cpus_are_in_xmon xmon_core xmon xmon_irq xmon_break_match xmon_iabr_match xmon_sstep xmon_bpt xmon_ipi xmon_write xmon_start_pagination xmon_end_pagination xmon_set_pagination_lpp xmon_putchar xmon_gets xmon_printf xmon_puts root@ubuntu:/sys/kernel/debug/tracing# After patch: root@ubuntu:/sys/kernel/debug/tracing# cat available_filter_functions | grep -i xmon root@ubuntu:/sys/kernel/debug/tracing# Signed-off-by: Naveen N. Rao <redacted> --- This is in addition to Breno's series to disable tracing while in xmon. While this patch prevents xmon core functions from being traced, Breno's series prevents other helpers used by xmon from logging entries into the trace buffer. - Naveen arch/powerpc/sysdev/xive/common.c | 6 +++--- arch/powerpc/xmon/Makefile | 13 +++++++++++++ 2 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/sysdev/xive/common.c b/arch/powerpc/sysdev/xive/common.c
index 6595462b1fc8..97e82a33b7be 100644
--- a/arch/powerpc/sysdev/xive/common.c
+++ b/arch/powerpc/sysdev/xive/common.c@@ -190,7 +190,7 @@ static u32 xive_scan_interrupts(struct xive_cpu *xc, bool just_peek) * This is used to perform the magic loads from an ESB * described in xive.h */ -static u8 xive_poke_esb(struct xive_irq_data *xd, u32 offset) +static notrace u8 xive_poke_esb(struct xive_irq_data *xd, u32 offset) { u64 val;
@@ -204,7 +204,7 @@ static u8 xive_poke_esb(struct xive_irq_data *xd, u32 offset) } #ifdef CONFIG_XMON -static void xive_dump_eq(const char *name, struct xive_q *q) +static notrace void xive_dump_eq(const char *name, struct xive_q *q) { u32 i0, i1, idx;
@@ -218,7 +218,7 @@ static void xive_dump_eq(const char *name, struct xive_q *q) q->toggle, i0, i1); } -void xmon_xive_do_dump(int cpu) +notrace void xmon_xive_do_dump(int cpu) { struct xive_cpu *xc = per_cpu(xive_cpu, cpu);
diff --git a/arch/powerpc/xmon/Makefile b/arch/powerpc/xmon/Makefile
index 0b2f771593eb..5f95af64cb8f 100644
--- a/arch/powerpc/xmon/Makefile
+++ b/arch/powerpc/xmon/Makefile@@ -7,6 +7,19 @@ UBSAN_SANITIZE := n ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC) +ifdef CONFIG_FUNCTION_TRACER +CFLAGS_REMOVE_xmon.o = -mno-sched-epilog $(CC_FLAGS_FTRACE) +CFLAGS_REMOVE_nonstdio.o = -mno-sched-epilog $(CC_FLAGS_FTRACE) +ifdef CONFIG_XMON_DISASSEMBLY +CFLAGS_REMOVE_ppc-dis.o = -mno-sched-epilog $(CC_FLAGS_FTRACE) +CFLAGS_REMOVE_ppc-opc.o = -mno-sched-epilog $(CC_FLAGS_FTRACE) +ifdef CONFIG_SPU_BASE +CFLAGS_REMOVE_spu-dis.o = -mno-sched-epilog $(CC_FLAGS_FTRACE) +CFLAGS_REMOVE_spu-opc.o = -mno-sched-epilog $(CC_FLAGS_FTRACE) +endif +endif +endif + obj-y += xmon.o nonstdio.o spr_access.o ifdef CONFIG_XMON_DISASSEMBLY
--
2.13.3