From: Laurent Vivier <laurent@vivier.eu>
To: qemu-devel@nongnu.org
Cc: "Peter Maydell" <peter.maydell@linaro.org>,
"Thomas Huth" <thuth@redhat.com>,
qemu-trivial@nongnu.org, "Martin Liška" <mliska@suse.cz>,
"Michael Tokarev" <mjt@tls.msk.ru>,
"Laurent Vivier" <laurent@vivier.eu>,
"Stafford Horne" <shorne@gmail.com>,
"Richard Henderson" <richard.henderson@linaro.org>,
"Philippe Mathieu-Daudé" <philmd@redhat.com>
Subject: [PULL v2 15/16] hw/openrisc/openrisc_sim: Add assertion to silence GCC warning
Date: Wed, 10 Jun 2020 15:10:10 +0200 [thread overview]
Message-ID: <20200610131011.1941209-16-laurent@vivier.eu> (raw)
In-Reply-To: <20200610131011.1941209-1-laurent@vivier.eu>
From: Philippe Mathieu-Daudé <philmd@redhat.com>
When compiling with GCC 10 (Fedora 32) using CFLAGS=-O2 we get:
CC or1k-softmmu/hw/openrisc/openrisc_sim.o
hw/openrisc/openrisc_sim.c: In function ‘openrisc_sim_init’:
hw/openrisc/openrisc_sim.c:87:42: error: ‘cpu_irqs[0]’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
87 | sysbus_connect_irq(s, i, cpu_irqs[i][irq_pin]);
| ~~~~~~~~^~~
While humans can tell smp_cpus will always be in the [1, 2] range,
(openrisc_sim_machine_init sets mc->max_cpus = 2), the compiler
can't.
Add an assertion to give the compiler a hint there's no use of
uninitialized data.
Buglink: https://bugs.launchpad.net/qemu/+bug/1874073
Reported-by: Martin Liška <mliska@suse.cz>
Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Tested-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: Stafford Horne <shorne@gmail.com>
Message-Id: <20200608160611.16966-1-philmd@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
hw/openrisc/openrisc_sim.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/hw/openrisc/openrisc_sim.c b/hw/openrisc/openrisc_sim.c
index d08ce6181199..02f5259e5e33 100644
--- a/hw/openrisc/openrisc_sim.c
+++ b/hw/openrisc/openrisc_sim.c
@@ -134,6 +134,7 @@ static void openrisc_sim_init(MachineState *machine)
int n;
unsigned int smp_cpus = machine->smp.cpus;
+ assert(smp_cpus >= 1 && smp_cpus <= 2);
for (n = 0; n < smp_cpus; n++) {
cpu = OPENRISC_CPU(cpu_create(machine->cpu_type));
if (cpu == NULL) {
--
2.26.2
next prev parent reply other threads:[~2020-06-10 13:23 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-10 13:09 [PULL v2 00/16] Trivial branch for 5.1 patches Laurent Vivier
2020-06-10 13:09 ` [PULL v2 01/16] Fix parameter type in vhost migration log path Laurent Vivier
2020-06-10 13:09 ` [PULL v2 02/16] net: Do not include a newline in the id of -nic devices Laurent Vivier
2020-06-10 13:09 ` [PULL v2 03/16] .mailmap: Update Fred Konrad email address Laurent Vivier
2020-06-10 13:09 ` [PULL v2 04/16] hw/unicore32/puv3: Use qemu_log_mask(ERROR) instead of debug printf() Laurent Vivier
2020-06-10 13:10 ` [PULL v2 05/16] hw/isa/apm: Convert debug printf()s to trace events Laurent Vivier
2020-06-10 13:10 ` [PULL v2 06/16] hw/misc/auxbus: Use qemu_log_mask(UNIMP) instead of debug printf Laurent Vivier
2020-06-10 13:10 ` [PULL v2 07/16] qemu-img: Fix doc typo for 'bitmap' subcommand Laurent Vivier
2020-06-10 13:10 ` [PULL v2 08/16] hw/arm/aspeed: Correct DRAM container region size Laurent Vivier
2020-06-10 13:10 ` [PULL v2 09/16] hw/hppa/dino: Use the IEC binary prefix definitions Laurent Vivier
2020-06-10 13:10 ` [PULL v2 10/16] hw/i386/xen/xen-hvm: " Laurent Vivier
2020-06-10 13:10 ` [PULL v2 11/16] target/i386/cpu: " Laurent Vivier
2020-06-10 13:10 ` [PULL v2 12/16] target/unicore32: Remove unused headers Laurent Vivier
2020-06-10 13:10 ` [PULL v2 13/16] target/unicore32: Replace DPRINTF() by qemu_log_mask(GUEST_ERROR) Laurent Vivier
2020-06-10 13:10 ` [PULL v2 14/16] target/unicore32: Prefer qemu_semihosting_log_out() over curses Laurent Vivier
2020-06-10 13:10 ` Laurent Vivier [this message]
2020-06-10 13:10 ` [PULL v2 16/16] semihosting: remove the pthread include which seems unused Laurent Vivier
2020-06-11 20:19 ` [PULL v2 00/16] Trivial branch for 5.1 patches Peter Maydell
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=20200610131011.1941209-16-laurent@vivier.eu \
--to=laurent@vivier.eu \
--cc=mjt@tls.msk.ru \
--cc=mliska@suse.cz \
--cc=peter.maydell@linaro.org \
--cc=philmd@redhat.com \
--cc=qemu-devel@nongnu.org \
--cc=qemu-trivial@nongnu.org \
--cc=richard.henderson@linaro.org \
--cc=shorne@gmail.com \
--cc=thuth@redhat.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).