| Message ID | 20180325180959.28008-2-stefan@agner.ch (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 25.03.2018 20:14, Nicolas Pitre wrote: > On Sun, 25 Mar 2018, Stefan Agner wrote: > >> Mixing asm and C code is not recommended in a naked function by >> gcc and leads to an error when using clang: >> drivers/bus/arm-cci.c:2107:2: error: non-ASM statement in naked >> function is not supported >> unreachable(); >> ^ >> >> While the function is marked __naked it actually properly return >> in asm. There is no need for the unreachable() call. >> >> Suggested-by: Russell King <linux@arm.linux.org.uk> >> Signed-off-by: Stefan Agner <stefan@agner.ch> > > If that doesn't introduce any warning with gcc then I'm fine with it. > At least with GCC 6.2 it did not introduce a new warning with gcc. > Acked-by: Nicolas Pitre <nico@linaro.org> Thanks! -- Stefan > > >> --- >> Changes in v2: >> - Don't add assembly ASM_UNREACHABLE, just drop unreachable() >> >> drivers/bus/arm-cci.c | 2 -- >> 1 file changed, 2 deletions(-) >> >> diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c >> index 5426c04fe24b..fc2da3a617ac 100644 >> --- a/drivers/bus/arm-cci.c >> +++ b/drivers/bus/arm-cci.c >> @@ -2103,8 +2103,6 @@ asmlinkage void __naked cci_enable_port_for_self(void) >> [sizeof_struct_cpu_port] "i" (sizeof(struct cpu_port)), >> [sizeof_struct_ace_port] "i" (sizeof(struct cci_ace_port)), >> [offsetof_port_phys] "i" (offsetof(struct cci_ace_port, phys)) ); >> - >> - unreachable(); >> } >> >> /** >> -- >> 2.16.2 >> >>
On 25.03.2018 20:09, Stefan Agner wrote: > Mixing asm and C code is not recommended in a naked function by > gcc and leads to an error when using clang: > drivers/bus/arm-cci.c:2107:2: error: non-ASM statement in naked > function is not supported > unreachable(); > ^ > > While the function is marked __naked it actually properly return > in asm. There is no need for the unreachable() call. Hi Arnd, I think previously changes to this driver went through one of your trees, can you pick this up? -- Stefan > > Suggested-by: Russell King <linux@arm.linux.org.uk> > Signed-off-by: Stefan Agner <stefan@agner.ch> > --- > Changes in v2: > - Don't add assembly ASM_UNREACHABLE, just drop unreachable() > > drivers/bus/arm-cci.c | 2 -- > 1 file changed, 2 deletions(-) > > diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c > index 5426c04fe24b..fc2da3a617ac 100644 > --- a/drivers/bus/arm-cci.c > +++ b/drivers/bus/arm-cci.c > @@ -2103,8 +2103,6 @@ asmlinkage void __naked cci_enable_port_for_self(void) > [sizeof_struct_cpu_port] "i" (sizeof(struct cpu_port)), > [sizeof_struct_ace_port] "i" (sizeof(struct cci_ace_port)), > [offsetof_port_phys] "i" (offsetof(struct cci_ace_port, phys)) ); > - > - unreachable(); > } > > /**
diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c index 5426c04fe24b..fc2da3a617ac 100644 --- a/drivers/bus/arm-cci.c +++ b/drivers/bus/arm-cci.c @@ -2103,8 +2103,6 @@ asmlinkage void __naked cci_enable_port_for_self(void) [sizeof_struct_cpu_port] "i" (sizeof(struct cpu_port)), [sizeof_struct_ace_port] "i" (sizeof(struct cci_ace_port)), [offsetof_port_phys] "i" (offsetof(struct cci_ace_port, phys)) ); - - unreachable(); } /**
Mixing asm and C code is not recommended in a naked function by gcc and leads to an error when using clang: drivers/bus/arm-cci.c:2107:2: error: non-ASM statement in naked function is not supported unreachable(); ^ While the function is marked __naked it actually properly return in asm. There is no need for the unreachable() call. Suggested-by: Russell King <linux@arm.linux.org.uk> Signed-off-by: Stefan Agner <stefan@agner.ch> --- Changes in v2: - Don't add assembly ASM_UNREACHABLE, just drop unreachable() drivers/bus/arm-cci.c | 2 -- 1 file changed, 2 deletions(-)