diff mbox series

[-next] riscv: perf: RISCV_BASE_PMU should be closeable

Message ID 20200507150445.174390-2-wangkefeng.wang@huawei.com (mailing list archive)
State New, archived
Headers show
Series [-next] riscv: perf: RISCV_BASE_PMU should be closeable | expand

Commit Message

Kefeng Wang May 7, 2020, 3:04 p.m. UTC
As 178e9fc47aae("perf: riscv: preliminary RISC-V support") said,
For RISCV_BASE_PMU, 'this option can also be disable to reduce kernel size',
but it could not work well, we need diable both RISCV_BASE_PMU and
PERF_EVENTS manually, or build error will occur when only disable
RISCV_BASE_PMU.

Cc: Alan Kao <alankao@andestech.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
 arch/riscv/include/asm/perf_event.h | 8 ++------
 arch/riscv/kernel/Makefile          | 2 +-
 2 files changed, 3 insertions(+), 7 deletions(-)

Comments

Palmer Dabbelt May 12, 2020, 9:02 p.m. UTC | #1
On Thu, 07 May 2020 08:04:45 PDT (-0700), wangkefeng.wang@huawei.com wrote:
> As 178e9fc47aae("perf: riscv: preliminary RISC-V support") said,
> For RISCV_BASE_PMU, 'this option can also be disable to reduce kernel size',
> but it could not work well, we need diable both RISCV_BASE_PMU and
> PERF_EVENTS manually, or build error will occur when only disable
> RISCV_BASE_PMU.

I'm worried this belies a larger issue related to how this PMU stuff works, but
we have only one PMU right now so it's not a pressing issue.  I've taken this
onto fixes.

Thanks!

>
> Cc: Alan Kao <alankao@andestech.com>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
> ---
>  arch/riscv/include/asm/perf_event.h | 8 ++------
>  arch/riscv/kernel/Makefile          | 2 +-
>  2 files changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/arch/riscv/include/asm/perf_event.h b/arch/riscv/include/asm/perf_event.h
> index 0234048b12bc..062efd3a1d5d 100644
> --- a/arch/riscv/include/asm/perf_event.h
> +++ b/arch/riscv/include/asm/perf_event.h
> @@ -12,19 +12,14 @@
>  #include <linux/ptrace.h>
>  #include <linux/interrupt.h>
>
> +#ifdef CONFIG_RISCV_BASE_PMU
>  #define RISCV_BASE_COUNTERS	2
>
>  /*
>   * The RISCV_MAX_COUNTERS parameter should be specified.
>   */
>
> -#ifdef CONFIG_RISCV_BASE_PMU
>  #define RISCV_MAX_COUNTERS	2
> -#endif
> -
> -#ifndef RISCV_MAX_COUNTERS
> -#error "Please provide a valid RISCV_MAX_COUNTERS for the PMU."
> -#endif
>
>  /*
>   * These are the indexes of bits in counteren register *minus* 1,
> @@ -82,6 +77,7 @@ struct riscv_pmu {
>  	int		irq;
>  };
>
> +#endif
>  #ifdef CONFIG_PERF_EVENTS
>  #define perf_arch_bpf_user_pt_regs(regs) (struct user_regs_struct *)regs
>  #endif
> diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
> index 1f5736e996fd..b355cf485671 100644
> --- a/arch/riscv/kernel/Makefile
> +++ b/arch/riscv/kernel/Makefile
> @@ -43,7 +43,7 @@ obj-$(CONFIG_MODULE_SECTIONS)	+= module-sections.o
>  obj-$(CONFIG_FUNCTION_TRACER)	+= mcount.o ftrace.o
>  obj-$(CONFIG_DYNAMIC_FTRACE)	+= mcount-dyn.o
>
> -obj-$(CONFIG_PERF_EVENTS)	+= perf_event.o
> +obj-$(CONFIG_RISCV_BASE_PMU)	+= perf_event.o
>  obj-$(CONFIG_PERF_EVENTS)	+= perf_callchain.o
>  obj-$(CONFIG_HAVE_PERF_REGS)	+= perf_regs.o
>  obj-$(CONFIG_RISCV_SBI)		+= sbi.o
diff mbox series

Patch

diff --git a/arch/riscv/include/asm/perf_event.h b/arch/riscv/include/asm/perf_event.h
index 0234048b12bc..062efd3a1d5d 100644
--- a/arch/riscv/include/asm/perf_event.h
+++ b/arch/riscv/include/asm/perf_event.h
@@ -12,19 +12,14 @@ 
 #include <linux/ptrace.h>
 #include <linux/interrupt.h>
 
+#ifdef CONFIG_RISCV_BASE_PMU
 #define RISCV_BASE_COUNTERS	2
 
 /*
  * The RISCV_MAX_COUNTERS parameter should be specified.
  */
 
-#ifdef CONFIG_RISCV_BASE_PMU
 #define RISCV_MAX_COUNTERS	2
-#endif
-
-#ifndef RISCV_MAX_COUNTERS
-#error "Please provide a valid RISCV_MAX_COUNTERS for the PMU."
-#endif
 
 /*
  * These are the indexes of bits in counteren register *minus* 1,
@@ -82,6 +77,7 @@  struct riscv_pmu {
 	int		irq;
 };
 
+#endif
 #ifdef CONFIG_PERF_EVENTS
 #define perf_arch_bpf_user_pt_regs(regs) (struct user_regs_struct *)regs
 #endif
diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
index 1f5736e996fd..b355cf485671 100644
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
@@ -43,7 +43,7 @@  obj-$(CONFIG_MODULE_SECTIONS)	+= module-sections.o
 obj-$(CONFIG_FUNCTION_TRACER)	+= mcount.o ftrace.o
 obj-$(CONFIG_DYNAMIC_FTRACE)	+= mcount-dyn.o
 
-obj-$(CONFIG_PERF_EVENTS)	+= perf_event.o
+obj-$(CONFIG_RISCV_BASE_PMU)	+= perf_event.o
 obj-$(CONFIG_PERF_EVENTS)	+= perf_callchain.o
 obj-$(CONFIG_HAVE_PERF_REGS)	+= perf_regs.o
 obj-$(CONFIG_RISCV_SBI)		+= sbi.o