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Fix fallback implementation for pg_atomic_test_set_flag().

The fallback implementation of pg_atomic_test_set_flag() that usesatomic-exchange gives pg_atomic_exchange_u32_impl() an extraargument. This issue has been present since the introduction ofthe atomics API in commitb64d92f.Reviewed-by: Andres FreundDiscussion:https://postgr.es/m/20231114035439.GA1809032%40nathanxps13Backpatch-through: 12

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src/include/port/atomics
- generic.h

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`‎src/include/port/atomics/generic.h`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -83,7 +83,7 @@ pg_atomic_init_flag_impl(volatile pg_atomic_flag *ptr)`
`83`	`83`	`staticinlinebool`
`84`	`84`	`pg_atomic_test_set_flag_impl(volatilepg_atomic_flag*ptr)`
`85`	`85`	`{`
`86`		`-returnpg_atomic_exchange_u32_impl(ptr,&value,1)==0;`
	`86`	`+returnpg_atomic_exchange_u32_impl(ptr,1)==0;`
`87`	`87`	`}`
`88`	`88`
`89`	`89`	`#definePG_HAVE_ATOMIC_UNLOCKED_TEST_FLAG`

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Commit69c32b8

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`‎src/include/port/atomics/generic.h`

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