pythongh-90815: Fix mimalloc atomic.h on Windows arm64 (python#111527)

vstinner · aisk · commit d007c5befa23 · 2024-02-11T19:37:30.000+08:00
mi_atomic_load_explicit() casts 'p' argument to drop the 'const'
qualifier on Windows arm64 platform. Fix the compiler warning:

    'function': different 'const' qualifiers
    (compiling source file ..\Objects\mimalloc\options.c)
diff --git a/Include/internal/mimalloc/mimalloc/atomic.h b/Include/internal/mimalloc/mimalloc/atomic.h
@@ -195,7 +195,7 @@ static inline uintptr_t mi_atomic_load_explicit(_Atomic(uintptr_t) const* p, mi_
 #else
   uintptr_t x = *p;
   if (mo > mi_memory_order_relaxed) {
-    while (!mi_atomic_compare_exchange_weak_explicit(p, &x, x, mo, mi_memory_order_relaxed)) { /* nothing */ };
+    while (!mi_atomic_compare_exchange_weak_explicit((_Atomic(uintptr_t)*)p, &x, x, mo, mi_memory_order_relaxed)) { /* nothing */ };
   }
   return x;
 #endif

Original file line number	Diff line number	Diff line change
`@@ -195,7 +195,7 @@ static inline uintptr_t mi_atomic_load_explicit(_Atomic(uintptr_t) const* p, mi_`
`195`	`195`	`#else`
`196`	`196`	`uintptr_t x = *p;`
`197`	`197`	`if (mo > mi_memory_order_relaxed) {`
`198`		`- while (!mi_atomic_compare_exchange_weak_explicit(p, &x, x, mo, mi_memory_order_relaxed)) { /* nothing */ };`
	`198`	`+ while (!mi_atomic_compare_exchange_weak_explicit((_Atomic(uintptr_t))p, &x, x, mo, mi_memory_order_relaxed)) { / nothing */ };`
`199`	`199`	`}`
`200`	`200`	`return x;`
`201`	`201`	`#endif`