linux-kernel - Re: Build regressions/improvements in v6.4

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Date:   Mon, 26 Jun 2023 10:24:18 +0200 (CEST)
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     linux-kernel@...r.kernel.org
cc:     Kalle Valo <kvalo@...nel.org>, linux-wireless@...r.kernel.org
Subject: Re: Build regressions/improvements in v6.4

On Mon, 26 Jun 2023, Geert Uytterhoeven wrote:
> JFYI, when comparing v6.4[1] to v6.4-rc7[3], the summaries are:
>  - build errors: +1/-0

   + /kisskb/src/drivers/net/wireless/cisco/airo.c: error: 'status_rid.currentXmitRate' is used uninitialized [-Werror=uninitialized]:  => 6163:45

sh4-gcc11/sh-allmodconfig
seen before

This is actually a real issue, and it's been here since basically forever.

drivers/net/wireless/cisco/airo.c:

     static int airo_get_rate(struct net_device *dev,
                              struct iw_request_info *info,
                              union iwreq_data *wrqu,
                              char *extra)
     {
             struct iw_param *vwrq = &wrqu->bitrate;
             struct airo_info *local = dev->ml_priv;
             StatusRid status_rid;           /* Card status info */

             readStatusRid(local, &status_rid, 1);

==>         vwrq->value = le16_to_cpu(status_rid.currentXmitRate) * 500000;
             ...
     }

     static int readStatusRid(struct airo_info *ai, StatusRid *statr, int lock)
     {
             return PC4500_readrid(ai, RID_STATUS, statr, sizeof(*statr), lock);
     }

     static int PC4500_readrid(struct airo_info *ai, u16 rid, void *pBuf, int len, int lock)
     {
             u16 status;
             int rc = SUCCESS;

             if (lock) {
                     if (down_interruptible(&ai->sem))
                             return ERROR;

pBuf output buffer contents not initialized.

             }
             ...
     }


> [1] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/6995e2de6891c724bfeb2db33d7b87775f913ad1/ (all 160 configs)
> [3] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/45a3e24f65e90a047bef86f927ebdc4c710edaa1/ (all 160 configs)

Gr{oetje,eeting}s,

 						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
 							    -- Linus Torvalds