[PATCH] arm64: entry: suppress W=1 prototype warnings

[Mark Rutland]

When building with W=1, GCC complains that we haven't defined prototypes
for a number of non-static functions in entry-common.c:

| arch/arm64/kernel/entry-common.c:203:25: warning: no previous prototype for 'el1_sync_handler' [-Wmissing-prototypes]
|   203 | asmlinkage void noinstr el1_sync_handler(struct pt_regs *regs)
|       |                         ^~~~~~~~~~~~~~~~
| arch/arm64/kernel/entry-common.c:377:25: warning: no previous prototype for 'el0_sync_handler' [-Wmissing-prototypes]
|   377 | asmlinkage void noinstr el0_sync_handler(struct pt_regs *regs)
|       |                         ^~~~~~~~~~~~~~~~
| arch/arm64/kernel/entry-common.c:447:25: warning: no previous prototype for 'el0_sync_compat_handler' [-Wmissing-prototypes]
|   447 | asmlinkage void noinstr el0_sync_compat_handler(struct pt_regs *regs)
|       |                         ^~~~~~~~~~~~~~~~~~~~~~~

... and so automated build systems using W=1 end up sending a number of
emails, despite this not being a real problem as the only callers are in
entry.S where prototypes cannot matter.

For similar cases in entry-common.c we added prototypes to
asm/exception.h, so let's do the same thing here for consistency.

Note that there are a number of other warnings printed with W=1, both
under arch/arm64 and in core code, and this patch only addresses the
cases in entry-common.c. Automated build systems typically filter these
warnings such that they're only reported when changes are made nearby,
so we don't need to solve them all at once.

Signed-off-by: Mark Rutland <mark.rutland at arm.com>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org>
---
 arch/arm64/include/asm/exception.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/include/asm/exception.h b/arch/arm64/include/asm/exception.h
index 0756191f44f6..30939e0fd625 100644
--- a/arch/arm64/include/asm/exception.h
+++ b/arch/arm64/include/asm/exception.h
@@ -31,6 +31,10 @@ static inline u32 disr_to_esr(u64 disr)
 	return esr;
 }
 
+asmlinkage void el1_sync_handler(struct pt_regs *regs);
+asmlinkage void el0_sync_handler(struct pt_regs *regs);
+asmlinkage void el0_sync_compat_handler(struct pt_regs *regs);
+
 asmlinkage void noinstr enter_el1_irq_or_nmi(struct pt_regs *regs);
 asmlinkage void noinstr exit_el1_irq_or_nmi(struct pt_regs *regs);
 asmlinkage void enter_from_user_mode(void);
-- 
2.11.0