| Message ID | 20190327184531.30986-11-julien.grall@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | xen/arm: Add support to build with clang | expand |
On 27/03/2019 18:45, Julien Grall wrote: > Clang will throw an error if a function is unused unless you tell > to ignore it. This can be done using __maybe_unused. > > Signed-off-by: Julien Grall <julien.grall@arm.com> > --- > xen/arch/arm/mm.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c > index 01ae2cccc0..d37925051a 100644 > --- a/xen/arch/arm/mm.c > +++ b/xen/arch/arm/mm.c > @@ -160,7 +160,8 @@ unsigned long total_pages; > extern char __init_begin[], __init_end[]; > > /* Checking VA memory layout alignment. */ > -static inline void check_memory_layout_alignment_constraints(void) { > +static __maybe_unused void check_memory_layout_alignment_constraints(void) As you're already changing this... The style used elsewhere is static void __init __maybe_unused build_assertions(void) which has the added advantage that it more obvious to future developers that trying to put code other than BUILD_BUG_ON() in it is a bad idea. It took me a moment to realise that this function deliberately wasn't called. ~Andrew > +{ > /* 2MB aligned regions */ > BUILD_BUG_ON(XEN_VIRT_START & ~SECOND_MASK); > BUILD_BUG_ON(FIXMAP_ADDR(0) & ~SECOND_MASK);
Hi Andrew, On 27/03/2019 19:10, Andrew Cooper wrote: > On 27/03/2019 18:45, Julien Grall wrote: >> Clang will throw an error if a function is unused unless you tell >> to ignore it. This can be done using __maybe_unused. >> >> Signed-off-by: Julien Grall <julien.grall@arm.com> >> --- >> xen/arch/arm/mm.c | 3 ++- >> 1 file changed, 2 insertions(+), 1 deletion(-) >> >> diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c >> index 01ae2cccc0..d37925051a 100644 >> --- a/xen/arch/arm/mm.c >> +++ b/xen/arch/arm/mm.c >> @@ -160,7 +160,8 @@ unsigned long total_pages; >> extern char __init_begin[], __init_end[]; >> >> /* Checking VA memory layout alignment. */ >> -static inline void check_memory_layout_alignment_constraints(void) { >> +static __maybe_unused void check_memory_layout_alignment_constraints(void) > > As you're already changing this... > > The style used elsewhere is > > static void __init __maybe_unused build_assertions(void) > > which has the added advantage that it more obvious to future developers > that trying to put code other than BUILD_BUG_ON() in it is a bad idea. Good point. I will update this patch (and the following one) to rename the function as well. Cheers,
diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c index 01ae2cccc0..d37925051a 100644 --- a/xen/arch/arm/mm.c +++ b/xen/arch/arm/mm.c @@ -160,7 +160,8 @@ unsigned long total_pages; extern char __init_begin[], __init_end[]; /* Checking VA memory layout alignment. */ -static inline void check_memory_layout_alignment_constraints(void) { +static __maybe_unused void check_memory_layout_alignment_constraints(void) +{ /* 2MB aligned regions */ BUILD_BUG_ON(XEN_VIRT_START & ~SECOND_MASK); BUILD_BUG_ON(FIXMAP_ADDR(0) & ~SECOND_MASK);
Clang will throw an error if a function is unused unless you tell to ignore it. This can be done using __maybe_unused. Signed-off-by: Julien Grall <julien.grall@arm.com> --- xen/arch/arm/mm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)