[PATCH 1/3] xen/arm: mark __guest_cmpxchg always_inline

[Stewart Hildebrand <stewart.hildebrand@xxxxxxx>]

When building the hypervisor with -Og, we run into a __bad_cmpxchg link error:

aarch64-none-linux-gnu-ld: prelink.o: in function `__int_cmpxchg':
.../xen/./arch/arm/include/asm/arm64/cmpxchg.h:117: undefined reference to 
`__bad_cmpxchg'
aarch64-none-linux-gnu-ld: .../xen/./arch/arm/include/asm/arm64/cmpxchg.h:117: 
undefined reference to `__bad_cmpxchg'
aarch64-none-linux-gnu-ld: ./.xen-syms.0: hidden symbol `__bad_cmpxchg' isn't 
defined
aarch64-none-linux-gnu-ld: final link failed: bad value

This is due to the function __guest_cmpxchg not being inlined in the -Og build
with gcc 12. Fix this by marking __guest_cmpxchg always_inline.

Signed-off-by: Stewart Hildebrand <stewart.hildebrand@xxxxxxx
---
I considered also changing "guest_cmpxchg64" just below in the same file to
always_inline, but I decided not to because this function does not take a size
parameter.
---
 xen/arch/arm/include/asm/guest_atomics.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/xen/arch/arm/include/asm/guest_atomics.h 
b/xen/arch/arm/include/asm/guest_atomics.h
index 9e2e96d4ff72..a1745f8613f6 100644
--- a/xen/arch/arm/include/asm/guest_atomics.h
+++ b/xen/arch/arm/include/asm/guest_atomics.h
@@ -86,11 +86,11 @@ static inline void guest_clear_mask16(struct domain *d, 
uint16_t mask,
     domain_unpause(d);
 }
 
-static inline unsigned long __guest_cmpxchg(struct domain *d,
-                                            volatile void *ptr,
-                                            unsigned long old,
-                                            unsigned long new,
-                                            unsigned int size)
+static always_inline unsigned long __guest_cmpxchg(struct domain *d,
+                                                   volatile void *ptr,
+                                                   unsigned long old,
+                                                   unsigned long new,
+                                                   unsigned int size)
 {
     unsigned long oldval = old;
 
-- 
2.40.0