linux-kernel - Re: [PATCH] [v2] net: hns3: reduce stack usage in hclge_dbg_dump_tm

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Date:   Mon, 4 Dec 2023 22:50:55 +0800
From:   Jijie Shao <shaojijie@...wei.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
CC:     <shaojijie@...wei.com>, Arnd Bergmann <arnd@...db.de>,
        Hao Chen <chenhao418@...wei.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [v2] net: hns3: reduce stack usage in
 hclge_dbg_dump_tm_pri()


on 2023/12/4 16:57, Arnd Bergmann wrote:
> s already allocated by debugfs,
> but that is a much larger change.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> v2: fix error handling leak
> ---
>   .../hisilicon/hns3/hns3pf/hclge_debugfs.c     | 21 ++++++++++++-------
>   1 file changed, 14 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
> index ff3f8f424ad9..8f94e13c1edf 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
> @@ -981,7 +981,7 @@ static const struct hclge_dbg_item tm_pri_items[] = {
>   
>   static int hclge_dbg_dump_tm_pri(struct hclge_dev *hdev, char *buf, int len)
>   {
> -	char data_str[ARRAY_SIZE(tm_pri_items)][HCLGE_DBG_DATA_STR_LEN];
> +	char *data_str;

We want to define variables in an inverted triangle based on the code length.
so, "char *data_str" should move four lines down.

   	struct hclge_tm_shaper_para c_shaper_para, p_shaper_para;
	char *result[ARRAY_SIZE(tm_pri_items)], *sch_mode_str;
	char content[HCLGE_DBG_TM_INFO_LEN];
	u8 pri_num, sch_mode, weight, i, j;
	char *data_str;
	int pos, ret;

>   	struct hclge_tm_shaper_para c_shaper_para, p_shaper_para;
>   	char *result[ARRAY_SIZE(tm_pri_items)], *sch_mode_str;
>   	char content[HCLGE_DBG_TM_INFO_LEN];
> @@ -992,8 +992,13 @@ static int hclge_dbg_dump_tm_pri(struct hclge_dev *hdev, char *buf, int len)
>   	if (ret)
>   		return ret;
>