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-rw-r--r--src/common/psprintf.c3
-rw-r--r--src/common/saslprep.c4
-rw-r--r--src/common/stringinfo.c3
-rw-r--r--src/include/common/fe_memutils.h12
4 files changed, 12 insertions, 10 deletions
diff --git a/src/common/psprintf.c b/src/common/psprintf.c
index a063fd26d51..2ebc01093f5 100644
--- a/src/common/psprintf.c
+++ b/src/common/psprintf.c
@@ -24,9 +24,6 @@
#include "postgres_fe.h"
-/* It's possible we could use a different value for this in frontend code */
-#define MaxAllocSize ((Size) 0x3fffffff) /* 1 gigabyte - 1 */
-
#endif
diff --git a/src/common/saslprep.c b/src/common/saslprep.c
index 0a840352802..5d84d13c6d2 100644
--- a/src/common/saslprep.c
+++ b/src/common/saslprep.c
@@ -24,10 +24,6 @@
#include "utils/memutils.h"
#else
#include "postgres_fe.h"
-
-/* It's possible we could use a different value for this in frontend code */
-#define MaxAllocSize ((Size) 0x3fffffff) /* 1 gigabyte - 1 */
-
#endif
#include "common/saslprep.h"
diff --git a/src/common/stringinfo.c b/src/common/stringinfo.c
index eb9d6502fc8..6192e65477e 100644
--- a/src/common/stringinfo.c
+++ b/src/common/stringinfo.c
@@ -24,9 +24,6 @@
#include "postgres_fe.h"
-/* It's possible we could use a different value for this in frontend code */
-#define MaxAllocSize ((Size) 0x3fffffff) /* 1 gigabyte - 1 */
-
#endif
#include "lib/stringinfo.h"
diff --git a/src/include/common/fe_memutils.h b/src/include/common/fe_memutils.h
index 492cc97e8d1..6544ebb44e5 100644
--- a/src/include/common/fe_memutils.h
+++ b/src/include/common/fe_memutils.h
@@ -10,6 +10,18 @@
#define FE_MEMUTILS_H
/*
+ * Assumed maximum size for allocation requests.
+ *
+ * We don't enforce this, so the actual maximum is the platform's SIZE_MAX.
+ * But it's useful to have it defined in frontend builds, so that common
+ * code can check for oversized requests without having frontend-vs-backend
+ * differences. Also, some code relies on MaxAllocSize being no more than
+ * INT_MAX/2, so rather than setting this to SIZE_MAX, make it the same as
+ * the backend's value.
+ */
+#define MaxAllocSize ((Size) 0x3fffffff) /* 1 gigabyte - 1 */
+
+/*
* Flags for pg_malloc_extended and palloc_extended, deliberately named
* the same as the backend flags.
*/