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powerpc/xmon: Exclude all of xmon from ftrace 

Exclude core xmon files from ftrace (along with an xmon xive helper
outside of xmon/) to minimize impact of ftrace while within xmon.

Before:
  /sys/kernel/debug/tracing# grep -ci xmon available_filter_functions
  26

After:
  /sys/kernel/debug/tracing# grep -ci xmon available_filter_functions
  0

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
[mpe: Use $(subst ..) on KBUILD_CFLAGS rather than CFLAGS_REMOVE_xxx]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Naveen N. Rao 2017-08-02 23:55:38 +05:30 committed by Michael Ellerman
parent ed49f7fd64
commit e12d94f806
2 changed files with 7 additions and 3 deletions
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6
arch/powerpc/sysdev/xive/common.c
View File

@ -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);

4
arch/powerpc/xmon/Makefile
View File

@ -5,6 +5,10 @@ subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror
GCOV_PROFILE := n
UBSAN_SANITIZE := n
# Disable ftrace for the entire directory
ORIG_CFLAGS := $(KBUILD_CFLAGS)
KBUILD_CFLAGS = $(subst -mno-sched-epilog,,$(subst $(CC_FLAGS_FTRACE),,$(ORIG_CFLAGS)))
ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
obj-y += xmon.o nonstdio.o spr_access.o