Re: [PATCH] xen: add missing noreturn attribute

["Marek Marczykowski-Górecki" <marmarek@invisiblethingslab.com>]

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On Thu, Jul 24, 2025 at 06:06:28PM -0700, Stefano Stabellini wrote:
> On Thu, 24 Jul 2025, Dmytro Prokopchuk1 wrote:
> > These functions never return to their caller,
> > causing a violation of MISRA C Rule 2.1:
> > "A project shall not contain unreachable code".
> > Add the `noreturn' attribute to fix this.
> > 
> > No functional changes.
> > 
> > Signed-off-by: Dmytro Prokopchuk <dmytro_prokopchuk1@epam.com>
> 
> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

Acked-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> # EFI

> 
> 
> > ---
> >  xen/arch/arm/domain.c  | 2 +-
> >  xen/arch/arm/setup.c   | 2 +-
> >  xen/arch/arm/smpboot.c | 2 +-
> >  xen/common/efi/boot.c  | 2 +-
> >  4 files changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
> > index 79a144e61b..310c578909 100644
> > --- a/xen/arch/arm/domain.c
> > +++ b/xen/arch/arm/domain.c
> > @@ -298,7 +298,7 @@ static void schedule_tail(struct vcpu *prev)
> >  extern void noreturn return_to_new_vcpu32(void);
> >  extern void noreturn return_to_new_vcpu64(void);
> >  
> > -static void continue_new_vcpu(struct vcpu *prev)
> > +static void noreturn continue_new_vcpu(struct vcpu *prev)
> >  {
> >      current->arch.actlr = READ_SYSREG(ACTLR_EL1);
> >      processor_vcpu_initialise(current);
> > diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
> > index 27bd3f5a6e..bb35afe56c 100644
> > --- a/xen/arch/arm/setup.c
> > +++ b/xen/arch/arm/setup.c
> > @@ -306,7 +306,7 @@ void __init init_pdx(void)
> >  size_t __read_mostly dcache_line_bytes;
> >  
> >  /* C entry point for boot CPU */
> > -void asmlinkage __init start_xen(unsigned long fdt_paddr)
> > +void asmlinkage __init noreturn start_xen(unsigned long fdt_paddr)
> >  {
> >      size_t fdt_size;
> >      const char *cmdline;
> > diff --git a/xen/arch/arm/smpboot.c b/xen/arch/arm/smpboot.c
> > index 73de7503e9..7f3cfa812e 100644
> > --- a/xen/arch/arm/smpboot.c
> > +++ b/xen/arch/arm/smpboot.c
> > @@ -315,7 +315,7 @@ smp_prepare_cpus(void)
> >  }
> >  
> >  /* Boot the current CPU */
> > -void asmlinkage start_secondary(void)
> > +void asmlinkage noreturn start_secondary(void)
> >  {
> >      unsigned int cpuid = init_data.cpuid;
> >  
> > diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
> > index df29444220..4b60bd719e 100644
> > --- a/xen/common/efi/boot.c
> > +++ b/xen/common/efi/boot.c
> > @@ -285,7 +285,7 @@ static bool __init match_guid(const EFI_GUID *guid1, const EFI_GUID *guid2)
> >  }
> >  
> >  /* generic routine for printing error messages */
> > -static void __init PrintErrMesg(const CHAR16 *mesg, EFI_STATUS ErrCode)
> > +static void __init noreturn PrintErrMesg(const CHAR16 *mesg, EFI_STATUS ErrCode)
> >  {
> >      StdOut = StdErr;
> >      PrintErr(mesg);
> > -- 
> > 2.43.0
> > 

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab

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