linux-kernel - Re: [PATCH] NDS32: export __trace_hardirqs_on/

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Date:   Tue, 28 Sep 2021 21:15:25 +0800
From:   Greentime Hu <green.hu@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Alan Kao <alankao@...estech.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nick Hu <nickhu@...estech.com>,
        Vincent Chen <deanbo422@...il.com>, kclin@...estech.com
Subject: Re: [PATCH] NDS32: export __trace_hardirqs_on/_offf for entry/exit

Randy Dunlap <rdunlap@...radead.org> 於 2021年9月28日 週二 下午1:27寫道：
>
> Add exports for __trace_hardirqs_on/_off and use them in
> kernel/ex-entry.S and kernel/ex-exit.S to fix build/linker errors.
>
> nds32le-linux-ld: arch/nds32/kernel/ex-entry.o: in function `fucop_ctl_done':
> (.text+0x12a): undefined reference to `__trace_hardirqs_off'
> (.text+0x12a): relocation truncated to fit: R_NDS32_25_PCREL_RELA against undefined symbol `__trace_hardirqs_off'
> nds32le-linux-ld: arch/nds32/kernel/ex-exit.o: in function `no_work_pending':
> (.text+0xea): undefined reference to `__trace_hardirqs_off'
> nds32le-linux-ld: (.text+0xee): undefined reference to `__trace_hardirqs_off'
> nds32le-linux-ld: (.text+0xf2): undefined reference to `__trace_hardirqs_on'
> nds32le-linux-ld: (.text+0xf6): undefined reference to `__trace_hardirqs_on'
>
> Fixes: 0cde56e0280d ("nds32: Fix a kernel panic issue because of wrong frame pointer access.")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Nick Hu <nickhu@...estech.com>
> Cc: Greentime Hu <green.hu@...il.com>
> Cc: Vincent Chen <deanbo422@...il.com>
> ---
>  arch/nds32/include/asm/ftrace.h |    3 +++
>  arch/nds32/kernel/ex-entry.S    |    1 +
>  arch/nds32/kernel/ex-exit.S     |    2 +-
>  arch/nds32/kernel/ftrace.c      |    3 +++
>  4 files changed, 8 insertions(+), 1 deletion(-)
>
> --- linux-next-20210917.orig/arch/nds32/kernel/ftrace.c
> +++ linux-next-20210917/arch/nds32/kernel/ftrace.c
> @@ -276,8 +276,11 @@ noinline void __trace_hardirqs_off(void)
>  {
>         trace_hardirqs_off();
>  }
> +EXPORT_SYMBOL(__trace_hardirqs_off);
> +
>  noinline void __trace_hardirqs_on(void)
>  {
>         trace_hardirqs_on();
>  }
> +EXPORT_SYMBOL(__trace_hardirqs_on);
>  #endif /* CONFIG_TRACE_IRQFLAGS */
> --- linux-next-20210917.orig/arch/nds32/include/asm/ftrace.h
> +++ linux-next-20210917/arch/nds32/include/asm/ftrace.h
> @@ -15,6 +15,9 @@
>
>  extern void _mcount(unsigned long parent_ip);
>
> +extern void __trace_hardirqs_off(void);
> +extern void __trace_hardirqs_on(void);
> +
>  #ifdef CONFIG_DYNAMIC_FTRACE
>
>  #define FTRACE_ADDR ((unsigned long)_ftrace_caller)
> --- linux-next-20210917.orig/arch/nds32/kernel/ex-entry.S
> +++ linux-next-20210917/arch/nds32/kernel/ex-entry.S
> @@ -8,6 +8,7 @@
>  #include <asm/asm-offsets.h>
>  #include <asm/page.h>
>  #include <asm/fpu.h>
> +#include <asm/ftrace.h>
>
>  #ifdef CONFIG_HWZOL
>         .macro push_zol
> --- linux-next-20210917.orig/arch/nds32/kernel/ex-exit.S
> +++ linux-next-20210917/arch/nds32/kernel/ex-exit.S
> @@ -9,7 +9,7 @@
>  #include <asm/thread_info.h>
>  #include <asm/current.h>
>  #include <asm/fpu.h>
> -
> +#include <asm/ftrace.h>
>
>
>  #ifdef CONFIG_HWZOL

loop in Alan and KC.