[PATCH v3] Only print debug message when failed to serach for kernel symbol from /proc/kallsyms

[Pratyush Anand]

On Friday 03 March 2017 09:22 AM, Baoquan He wrote:
> Kernel symbol page_offset_base could be unavailable when mm KASLR code is
> not compiled in kernel. It's unappropriate to print out error message
> when failed to search for page_offset_base from /proc/kallsyms. Seems now
> there is not a way to find out if mm KASLR is compiled in or not. An
> alternative approach is only printing out debug message in get_kernel_sym
> if failed to search a expected kernel symbol.
>
> Do it in this patch, a simple fix.
>
> Signed-off-by: Baoquan He <bhe at redhat.com>

Yes, a particular symbol can be kernel version dependent and may not be 
available in all the kernel version.

Reviewed-by: Pratyush Anand <panand at redhat.com>

> ---
>  kexec/arch/i386/crashdump-x86.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kexec/arch/i386/crashdump-x86.c b/kexec/arch/i386/crashdump-x86.c
> index 88aeee3..c4cf201 100644
> --- a/kexec/arch/i386/crashdump-x86.c
> +++ b/kexec/arch/i386/crashdump-x86.c
> @@ -127,7 +127,7 @@ static unsigned long long get_kernel_sym(const char *symbol)
>  		}
>  	}
>
> -	fprintf(stderr, "Cannot get kernel %s symbol address\n", symbol);
> +	dbgprintf("Cannot get kernel %s symbol address\n", symbol);
>  	return 0;
>  }
>
>