Re: [PATCH 1/4] riscv: remove extra level wrappers of trace_hardirqs_{on,off}

From: Guo Ren <guoren@kernel.org>
To: Jisheng Zhang <jszhang@kernel.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	 Albert Ou <aou@eecs.berkeley.edu>,
	Nathan Chancellor <nathan@kernel.org>,
	 Nick Desaulniers <ndesaulniers@google.com>,
	linux-riscv@lists.infradead.org,  linux-kernel@vger.kernel.org,
	llvm@lists.linux.dev
Subject: Re: [PATCH 1/4] riscv: remove extra level wrappers of trace_hardirqs_{on,off}
Date: Mon, 26 Sep 2022 07:18:26 +0800	[thread overview]
Message-ID: <CAJF2gTSXDYLk07yYU-fUNg12k_7+Pmm8tQDnsRHw4Ka5vX8JyA@mail.gmail.com> (raw)
In-Reply-To: <20220925175356.681-2-jszhang@kernel.org>

Reviewed-by: Guo Ren <guoren@kernel.org>

I would involve the patch in the generic entry series, okay?

On Mon, Sep 26, 2022 at 2:03 AM Jisheng Zhang <jszhang@kernel.org> wrote:
>
> Since riscv is converted to generic entry, there's no need for the
> extra wrappers of trace_hardirqs_{on,off}.
>
> Tested with llvm + irqsoff.
>
> Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
> ---
>  arch/riscv/kernel/Makefile    |  2 --
>  arch/riscv/kernel/trace_irq.c | 27 ---------------------------
>  arch/riscv/kernel/trace_irq.h | 11 -----------
>  3 files changed, 40 deletions(-)
>  delete mode 100644 arch/riscv/kernel/trace_irq.c
>  delete mode 100644 arch/riscv/kernel/trace_irq.h
>
> diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
> index 01da14e21019..11ee206cc235 100644
> --- a/arch/riscv/kernel/Makefile
> +++ b/arch/riscv/kernel/Makefile
> @@ -69,8 +69,6 @@ obj-$(CONFIG_CPU_PM)          += suspend_entry.o suspend.o
>  obj-$(CONFIG_FUNCTION_TRACER)  += mcount.o ftrace.o
>  obj-$(CONFIG_DYNAMIC_FTRACE)   += mcount-dyn.o
>
> -obj-$(CONFIG_TRACE_IRQFLAGS)   += trace_irq.o
> -
>  obj-$(CONFIG_PERF_EVENTS)      += perf_callchain.o
>  obj-$(CONFIG_HAVE_PERF_REGS)   += perf_regs.o
>  obj-$(CONFIG_RISCV_SBI)                += sbi.o
> diff --git a/arch/riscv/kernel/trace_irq.c b/arch/riscv/kernel/trace_irq.c
> deleted file mode 100644
> index 095ac976d7da..000000000000
> --- a/arch/riscv/kernel/trace_irq.c
> +++ /dev/null
> @@ -1,27 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -/*
> - * Copyright (C) 2022 Changbin Du <changbin.du@gmail.com>
> - */
> -
> -#include <linux/irqflags.h>
> -#include <linux/kprobes.h>
> -#include "trace_irq.h"
> -
> -/*
> - * trace_hardirqs_on/off require the caller to setup frame pointer properly.
> - * Otherwise, CALLER_ADDR1 might trigger an pagging exception in kernel.
> - * Here we add one extra level so they can be safely called by low
> - * level entry code which $fp is used for other purpose.
> - */
> -
> -void __trace_hardirqs_on(void)
> -{
> -       trace_hardirqs_on();
> -}
> -NOKPROBE_SYMBOL(__trace_hardirqs_on);
> -
> -void __trace_hardirqs_off(void)
> -{
> -       trace_hardirqs_off();
> -}
> -NOKPROBE_SYMBOL(__trace_hardirqs_off);
> diff --git a/arch/riscv/kernel/trace_irq.h b/arch/riscv/kernel/trace_irq.h
> deleted file mode 100644
> index 99fe67377e5e..000000000000
> --- a/arch/riscv/kernel/trace_irq.h
> +++ /dev/null
> @@ -1,11 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 */
> -/*
> - * Copyright (C) 2022 Changbin Du <changbin.du@gmail.com>
> - */
> -#ifndef __TRACE_IRQ_H
> -#define __TRACE_IRQ_H
> -
> -void __trace_hardirqs_on(void);
> -void __trace_hardirqs_off(void);
> -
> -#endif /* __TRACE_IRQ_H */
> --
> 2.34.1
>

-- 
Best Regards
 Guo Ren