From: Emil Velikov <emil.l.velikov@gmail.com>
To: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: linux-modules@vger.kernel.org
Subject: Re: [PATCH kmod 09/13] libkmod: swap alloca usage for a few assert_cc
Date: Tue, 30 Apr 2024 18:54:00 +0100 [thread overview]
Message-ID: <CACvgo52PTWuDcv-P0Ls1oESo-cOsygUpD-rbK9oUTHy30HpS6w@mail.gmail.com> (raw)
In-Reply-To: <37jvg2krroliuncyposassjhznjcgrxmvdre4mesl23npukbpn@jz7ntjkcpd7o>
On Tue, 30 Apr 2024 at 18:39, Lucas De Marchi <lucas.demarchi@intel.com> wrote:
>
> On Mon, Feb 12, 2024 at 05:23:10PM GMT, Emil Velikov via B4 Relay wrote:
> >From: Emil Velikov <emil.l.velikov@gmail.com>
> >
> >Since all the compression magic is always available now, we don't need
> >to loop at runtime nor use alloca - latter of which comes with a handful
> >of caveats.
> >
> >Simply throw in a few assert_cc(), which will trigger at build-time.
> >
> >Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
> >---
> > libkmod/libkmod-file.c | 22 ++++++++--------------
> > 1 file changed, 8 insertions(+), 14 deletions(-)
> >
> >diff --git a/libkmod/libkmod-file.c b/libkmod/libkmod-file.c
> >index b69f1ef..5b88d6c 100644
> >--- a/libkmod/libkmod-file.c
> >+++ b/libkmod/libkmod-file.c
> >@@ -410,7 +410,6 @@ struct kmod_file *kmod_file_open(const struct kmod_ctx *ctx,
> > {
> > struct kmod_file *file = calloc(1, sizeof(struct kmod_file));
> > const struct comp_type *itr;
> >- size_t magic_size_max = 0;
> > int err = 0;
> >
> > if (file == NULL)
> >@@ -422,22 +421,17 @@ struct kmod_file *kmod_file_open(const struct kmod_ctx *ctx,
> > goto error;
> > }
> >
> >- for (itr = comp_types; itr->load != NULL; itr++) {
> >- if (magic_size_max < itr->magic_size)
> >- magic_size_max = itr->magic_size;
> >- }
> >-
> >- if (magic_size_max > 0) {
> >- char *buf = alloca(magic_size_max + 1);
> >+ {
> >+ char buf[7];
> > ssize_t sz;
> >
> >- if (buf == NULL) {
> >- err = -errno;
> >- goto error;
> >- }
> >- sz = read_str_safe(file->fd, buf, magic_size_max + 1);
> >+ assert_cc(sizeof(magic_zstd) < sizeof(buf));
> >+ assert_cc(sizeof(magic_xz) < sizeof(buf));
> >+ assert_cc(sizeof(magic_zlib) < sizeof(buf));
>
> ../libkmod/libkmod-file.c: In function 'kmod_file_open':
> ../shared/macro.h:25:9: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
Is there a particular use-case for explicitly forcing C90?
The configure.ac contains `AC_PROG_CC_C99`, which seems reasonable
IMHO. Plus the autogen.sh goes a step further with `-std=gnu11`
Thanks
Emil
next prev parent reply other threads:[~2024-04-30 17:54 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-12 17:23 [PATCH kmod 00/13] Load compressed modules with compression-less kmod Emil Velikov via B4 Relay
2024-02-12 17:23 ` [PATCH kmod 01/13] libkmod: use a dup()'d fd for zlib Emil Velikov via B4 Relay
2024-04-29 23:13 ` Lucas De Marchi
2024-02-12 17:23 ` [PATCH kmod 02/13] libkmod: keep gzFile gzf local to load_zlib() Emil Velikov via B4 Relay
2024-04-29 21:52 ` Lucas De Marchi
2024-02-12 17:23 ` [PATCH kmod 03/13] libkmod: remove kmod_file::{zstd,xz}_used flags Emil Velikov via B4 Relay
2024-04-29 21:54 ` Lucas De Marchi
2024-02-12 17:23 ` [PATCH kmod 04/13] libkmod: clear file->memory if map fails Emil Velikov via B4 Relay
2024-04-29 23:13 ` Lucas De Marchi
2024-02-12 17:23 ` [PATCH kmod 05/13] libkmod: nuke struct file_ops Emil Velikov via B4 Relay
2024-04-29 23:13 ` Lucas De Marchi
2024-02-12 17:23 ` [PATCH kmod 06/13] libkmod: propagate {zstd,xz,zlib}_load errors Emil Velikov via B4 Relay
2024-04-29 23:14 ` Lucas De Marchi
2024-02-12 17:23 ` [PATCH kmod 07/13] libkmod: move kmod_file_load_contents as applicable Emil Velikov via B4 Relay
2024-04-29 23:14 ` Lucas De Marchi
2024-02-12 17:23 ` [PATCH kmod 08/13] libkmod: always detect the module compression Emil Velikov via B4 Relay
2024-02-13 16:33 ` Emil Velikov
2024-04-29 23:13 ` Lucas De Marchi
2024-02-12 17:23 ` [PATCH kmod 09/13] libkmod: swap alloca usage for a few assert_cc Emil Velikov via B4 Relay
2024-04-29 23:19 ` Lucas De Marchi
2024-04-30 17:39 ` Lucas De Marchi
2024-04-30 17:54 ` Emil Velikov [this message]
2024-04-30 18:17 ` Lucas De Marchi
2024-04-30 18:27 ` Emil Velikov
2024-04-30 18:43 ` Lucas De Marchi
2024-04-30 18:47 ` Emil Velikov
2024-04-30 20:36 ` Lucas De Marchi
2024-02-12 17:23 ` [PATCH kmod 10/13] libkmod: tidy-up kmod_file_open() Emil Velikov via B4 Relay
2024-04-29 23:25 ` Lucas De Marchi
2024-02-12 17:23 ` [PATCH kmod 11/13] libkmod: move load_reg() further up Emil Velikov via B4 Relay
2024-04-29 23:30 ` Lucas De Marchi
2024-02-12 17:23 ` [PATCH kmod 12/13] libkmod: keep KMOD_FILE_COMPRESSION_NONE/load_reg in comp_types Emil Velikov via B4 Relay
2024-04-29 23:32 ` Lucas De Marchi
2024-02-12 17:23 ` [PATCH kmod 13/13] libkmod: always fallback to do_init_module() Emil Velikov via B4 Relay
2024-04-29 23:39 ` Lucas De Marchi
2024-04-30 17:48 ` Emil Velikov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CACvgo52PTWuDcv-P0Ls1oESo-cOsygUpD-rbK9oUTHy30HpS6w@mail.gmail.com \
--to=emil.l.velikov@gmail.com \
--cc=linux-modules@vger.kernel.org \
--cc=lucas.demarchi@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).