From: David Gibson <david@gibson.dropbear.id.au>
To: Thomas Huth <thuth@redhat.com>
Cc: zhang.zhanghailiang@huawei.com, qemu-trivial@nongnu.org,
qemu-devel@nongnu.org, ganqixin@huawei.com,
"Euler Robot" <euler.robot@huawei.com>,
"Chen Qun" <kuhn.chenqun@huawei.com>,
"Philippe Mathieu-Daudé" <philmd@redhat.com>
Subject: Re: [PATCH 8/9] target/ppc: silence the compiler warnings
Date: Thu, 29 Oct 2020 10:39:10 +1100 [thread overview]
Message-ID: <20201028233910.GH5604@yekko.fritz.box> (raw)
In-Reply-To: <c8255814-80ff-8937-938f-158ff924bb91@redhat.com>
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On Wed, Oct 28, 2020 at 04:06:03PM +0100, Thomas Huth wrote:
> On 28/10/2020 10.56, Philippe Mathieu-Daudé wrote:
> > On 10/28/20 5:18 AM, Chen Qun wrote:
> >> When using -Wimplicit-fallthrough in our CFLAGS, the compiler showed warning:
> >> target/ppc/mmu_helper.c: In function ‘dump_mmu’:
> >> target/ppc/mmu_helper.c:1351:12: warning: this statement may fall through [-Wimplicit-fallthrough=]
> >> 1351 | if (ppc64_v3_radix(env_archcpu(env))) {
> >> | ^
> >> target/ppc/mmu_helper.c:1358:5: note: here
> >> 1358 | default:
> >> | ^~~~~~~
> >>
> >> Add the corresponding "fall through" comment to fix it.
> >>
> >> Reported-by: Euler Robot <euler.robot@huawei.com>
> >> Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com>
> >> ---
> >> Cc: David Gibson <david@gibson.dropbear.id.au>
> >> ---
> >> target/ppc/mmu_helper.c | 1 +
> >> 1 file changed, 1 insertion(+)
> >>
> >> diff --git a/target/ppc/mmu_helper.c b/target/ppc/mmu_helper.c
> >> index 8972714775..51749b62df 100644
> >> --- a/target/ppc/mmu_helper.c
> >> +++ b/target/ppc/mmu_helper.c
> >> @@ -1355,6 +1355,7 @@ void dump_mmu(CPUPPCState *env)
> >> break;
> >> }
> >> #endif
> >> + /* fall through */
> >
> > I'm surprise the compiler emit a warning for missing comment,
> > but don't emit one for superfluous and confusing ones (when
> > building a ppc32-only target). You'd need to put this before
> > the #endif.
> >
> > But instead of this band-aid to silent warning, replace the
> > TODO by a LOG_UNIMP call, and add a break before the #endif.
>
> +1 for replacing the TODO with a LOG_UNIMP call and adding a break instead,
> that would look way less messy than the current code.
True, that would be a better approach.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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next prev parent reply other threads:[~2020-10-29 0:40 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-28 4:18 [PATCH 0/9] silence the compiler warnings Chen Qun
2020-10-28 4:18 ` [PATCH 1/9] target/i386: silence the compiler warnings in gen_shiftd_rm_T1 Chen Qun
2020-10-28 12:57 ` Thomas Huth
2020-10-28 13:20 ` Philippe Mathieu-Daudé
2020-10-28 15:31 ` Richard Henderson
2020-10-28 16:51 ` Thomas Huth
2020-10-29 2:40 ` Chenqun (kuhn)
2020-10-28 15:31 ` Richard Henderson
2020-10-28 4:18 ` [PATCH 2/9] hw/intc/arm_gicv3_kvm: silence the compiler warnings Chen Qun
2020-10-28 20:20 ` Peter Maydell
2020-10-28 4:18 ` [PATCH 3/9] accel/tcg/user-exec: " Chen Qun
2020-10-28 13:52 ` Thomas Huth
2020-10-28 15:37 ` Richard Henderson
2020-10-29 6:13 ` Chenqun (kuhn)
2020-10-28 4:18 ` [PATCH 4/9] linux-user/mips/cpu_loop: " Chen Qun
2020-10-28 13:22 ` Thomas Huth
2020-10-28 4:18 ` [PATCH 5/9] target/sparc/translate: " Chen Qun
2020-10-28 6:39 ` Artyom Tarasenko
2020-10-28 9:50 ` Philippe Mathieu-Daudé
2020-10-28 4:18 ` [PATCH 6/9] target/sparc/win_helper: " Chen Qun
2020-10-28 6:42 ` Artyom Tarasenko
2020-10-28 9:51 ` Philippe Mathieu-Daudé
2020-10-29 2:45 ` Chenqun (kuhn)
2020-10-28 4:18 ` [PATCH 7/9] ppc: " Chen Qun
2020-10-28 4:29 ` David Gibson
2020-10-28 14:42 ` Thomas Huth
2020-10-28 23:38 ` David Gibson
2020-10-29 7:06 ` Chenqun (kuhn)
2020-10-28 4:18 ` [PATCH 8/9] target/ppc: " Chen Qun
2020-10-28 4:30 ` David Gibson
2020-10-28 9:56 ` Philippe Mathieu-Daudé
2020-10-28 15:06 ` Thomas Huth
2020-10-28 23:39 ` David Gibson [this message]
2020-10-29 7:16 ` Chenqun (kuhn)
2020-10-28 4:18 ` [PATCH 9/9] hw/timer/renesas_tmr: " Chen Qun
2020-10-28 9:59 ` Philippe Mathieu-Daudé
2020-10-28 15:04 ` Thomas Huth
2020-10-28 20:14 ` Peter Maydell
2020-10-29 8:26 ` Chenqun (kuhn)
2020-10-29 8:12 ` Chenqun (kuhn)
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