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Fix range check for effective_io_concurrency

Commit1aba62e moved the range check of that option form guc.c intobufmgr.c, but introduced a bug by changing a >= 0.0 to > 0.0, which madethe value 0 no longer accepted. Put it back.Reported by Jeff Janes, diagnosed by Tom Lane

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src/backend/storage/buffer
- bufmgr.c

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`‎src/backend/storage/buffer/bufmgr.c`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -514,7 +514,7 @@ ComputeIoConcurrency(int io_concurrency, double *target)`
`514`	`514`	`*target=new_prefetch_pages;`
`515`	`515`
`516`	`516`	`/* This range check shouldn't fail, but let's be paranoid */`
`517`		`-return (new_prefetch_pages>0.0&&new_prefetch_pages< (double)INT_MAX);`
	`517`	`+return (new_prefetch_pages >=0.0&&new_prefetch_pages< (double)INT_MAX);`
`518`	`518`	`}`
`519`	`519`
`520`	`520`	`/*`

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Commit0c7cd45

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`‎src/backend/storage/buffer/bufmgr.c`

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