lkml.org 
[lkml]   [2022]   [Oct]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] nvme-tcp: replace sg_init_marker() with sg_init_table()
On Tue, Oct 25, 2022 at 12:58:41AM +0000, Chaitanya Kulkarni wrote:
> On 10/22/22 10:46, Nam Cao wrote:
> > In nvme_tcp_ddgst_update(), sg_init_marker() is called with an
> > uninitialized scatterlist. This is probably fine, but gcc complains:
> >
> > CC [M] drivers/nvme/host/tcp.o
> > In file included from ./include/linux/dma-mapping.h:10,
> > from ./include/linux/skbuff.h:31,
> > from ./include/net/net_namespace.h:43,
> > from ./include/linux/netdevice.h:38,
> > from ./include/net/sock.h:46,
> > from drivers/nvme/host/tcp.c:12:
> > In function ‘sg_mark_end’,
> > inlined from ‘sg_init_marker’ at ./include/linux/scatterlist.h:356:2,
> > inlined from ‘nvme_tcp_ddgst_update’ at drivers/nvme/host/tcp.c:390:2:
> > ./include/linux/scatterlist.h:234:11: error: ‘sg.page_link’ is used uninitialized [-Werror=uninitialized]
> > 234 | sg->page_link |= SG_END;
> > | ~~^~~~~~~~~~~
> > drivers/nvme/host/tcp.c: In function ‘nvme_tcp_ddgst_update’:
> > drivers/nvme/host/tcp.c:388:28: note: ‘sg’ declared here
> > 388 | struct scatterlist sg;
> > | ^~
> > cc1: all warnings being treated as errors
> >
> > Use sg_init_table() instead, which basically memset the scatterlist to
> > zero first before calling sg_init_marker().
> >
> > Signed-off-by: Nam Cao <namcaov@gmail.com>
>
> Looks good to me, can you please share what version if gcc you are
> using ? my test setup did not catch this error and I'd like to update
> with the one that can catch these errors.

It was just gcc12. But strange enough I cannot trigger this error again.
I was doing randconfig test build. Probably only a specific combination
of configs that can allow gcc to detect this...

And sorry but I was just start doing randconfig test and didn't think
about saving that .config file.

Best regards,
Nam

\
 
 \ /
  Last update: 2022-10-25 11:32    [W:0.313 / U:0.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site