| Message ID | 20201028041819.2169003-9-kuhn.chenqun@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | silence the compiler warnings | expand |
On Wed, Oct 28, 2020 at 12:18:18PM +0800, 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> Acked-by: David Gibson <david@gibson.dropbear.id.au> > --- > 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 */ > default: > qemu_log_mask(LOG_UNIMP, "%s: unimplemented\n", __func__); > }
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. > default: > qemu_log_mask(LOG_UNIMP, "%s: unimplemented\n", __func__); > } >
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. Thanks, Thomas
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.
> -----Original Message----- > From: David Gibson [mailto:david@gibson.dropbear.id.au] > Sent: Thursday, October 29, 2020 7:39 AM > To: Thomas Huth <thuth@redhat.com> > Cc: Philippe Mathieu-Daudé <philmd@redhat.com>; Chenqun (kuhn) > <kuhn.chenqun@huawei.com>; qemu-devel@nongnu.org; > qemu-trivial@nongnu.org; Euler Robot <euler.robot@huawei.com>; > Zhanghailiang <zhang.zhanghailiang@huawei.com>; ganqixin > <ganqixin@huawei.com> > Subject: Re: [PATCH 8/9] target/ppc: silence the compiler warnings > > 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. Yeah, that's a good idea. I'll modify it in the v2. Thanks, Chen Qun > > -- > 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
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 */ default: qemu_log_mask(LOG_UNIMP, "%s: unimplemented\n", __func__); }
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(+)