linux-kernel - Re: [PATCH 4.14 103/156] scripts/faddr2line: extend usage on generic arch

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Date:   Sun, 4 Feb 2018 14:46:58 +0800
From:   "Liu, Changcheng" <changcheng.liu@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, kstewart@...uxfoundation.org,
        neilb@...e.com, tglx@...utronix.de, akpm@...ux-foundation.org,
        torvalds@...ux-foundation.org, alexander.levin@...izon.com
Subject: Re: [PATCH 4.14 103/156] scripts/faddr2line: extend usage on generic
 arch

Hi Greg Kroah-Hartman,
    Below commit is needed to resolve issue in this patch:
        Upstream commit 4cc90b4cc3d4955f79eae4f7f9d64e67e17b468e

B.R.
Changcheng

On 17:58 Fri 02 Feb, Greg Kroah-Hartman wrote:
> 4.14-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: "Liu, Changcheng" <changcheng.liu@...el.com>
> 
> 
> [ Upstream commit 95a87982541932503d3f59aba4c30b0bde0a6294 ]
> 
> When cross-compiling, fadd2line should use the binary tool used for the
> target system, rather than that of the host.
> 
> Link: http://lkml.kernel.org/r/20171121092911.GA150711@sofia
> Signed-off-by: Liu Changcheng <changcheng.liu@...el.com>
> Cc: Kate Stewart <kstewart@...uxfoundation.org>
> Cc: NeilBrown <neilb@...e.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  scripts/faddr2line |   21 ++++++++++++++-------
>  1 file changed, 14 insertions(+), 7 deletions(-)
> 
> --- a/scripts/faddr2line
> +++ b/scripts/faddr2line
> @@ -44,9 +44,16 @@
>  set -o errexit
>  set -o nounset
>  
> +READELF="${CROSS_COMPILE}readelf"
> +ADDR2LINE="${CROSS_COMPILE}addr2line"
> +SIZE="${CROSS_COMPILE}size"
> +NM="${CROSS_COMPILE}nm"
> +
>  command -v awk >/dev/null 2>&1 || die "awk isn't installed"
> -command -v readelf >/dev/null 2>&1 || die "readelf isn't installed"
> -command -v addr2line >/dev/null 2>&1 || die "addr2line isn't installed"
> +command -v ${READELF} >/dev/null 2>&1 || die "readelf isn't installed"
> +command -v ${ADDR2LINE} >/dev/null 2>&1 || die "addr2line isn't installed"
> +command -v ${SIZE} >/dev/null 2>&1 || die "size isn't installed"
> +command -v ${NM} >/dev/null 2>&1 || die "nm isn't installed"
>  
>  usage() {
>  	echo "usage: faddr2line <object file> <func+offset> <func+offset>..." >&2
> @@ -69,10 +76,10 @@ die() {
>  find_dir_prefix() {
>  	local objfile=$1
>  
> -	local start_kernel_addr=$(readelf -sW $objfile | awk '$8 == "start_kernel" {printf "0x%s", $2}')
> +	local start_kernel_addr=$(${READELF} -sW $objfile | awk '$8 == "start_kernel" {printf "0x%s", $2}')
>  	[[ -z $start_kernel_addr ]] && return
>  
> -	local file_line=$(addr2line -e $objfile $start_kernel_addr)
> +	local file_line=$(${ADDR2LINE} -e $objfile $start_kernel_addr)
>  	[[ -z $file_line ]] && return
>  
>  	local prefix=${file_line%init/main.c:*}
> @@ -104,7 +111,7 @@ __faddr2line() {
>  
>  	# Go through each of the object's symbols which match the func name.
>  	# In rare cases there might be duplicates.
> -	file_end=$(size -Ax $objfile | awk '$1 == ".text" {print $2}')
> +	file_end=$(${SIZE} -Ax $objfile | awk '$1 == ".text" {print $2}')
>  	while read symbol; do
>  		local fields=($symbol)
>  		local sym_base=0x${fields[0]}
> @@ -156,10 +163,10 @@ __faddr2line() {
>  
>  		# pass real address to addr2line
>  		echo "$func+$offset/$sym_size:"
> -		addr2line -fpie $objfile $addr | sed "s; $dir_prefix\(\./\)*; ;"
> +		${ADDR2LINE} -fpie $objfile $addr | sed "s; $dir_prefix\(\./\)*; ;"
>  		DONE=1
>  
> -	done < <(nm -n $objfile | awk -v fn=$func -v end=$file_end '$3 == fn { found=1; line=$0; start=$1; next } found == 1 { found=0; print line, "0x"$1 } END {if (found == 1) print line, end; }')
> +	done < <(${NM} -n $objfile | awk -v fn=$func -v end=$file_end '$3 == fn { found=1; line=$0; start=$1; next } found == 1 { found=0; print line, "0x"$1 } END {if (found == 1) print line, end; }')
>  }
>  
>  [[ $# -lt 2 ]] && usage
> 
>