Damien, > There is no need to arbitrarily limit the size of a report zone to the > number of zones defined by SD_ZBC_REPORT_MAX_ZONES. Rather, simply > calculate the report buffer size needed for the requested number of > zones without exceeding the device total number of zones. This buffer > size limitation to the hardware maximum transfer size and page mapping > capabilities is kept unchanged. Starting with this initial buffer size, > the allocation is optimized by iterating over decreasing buffer size > until the allocation succeeds (each iteration is allowed to fail fast > using the __GFP_NORETRY flag). This ensures forward progress for zone > reports and avoids failures of zones revalidation under memory pressure. Acked-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> -- Martin K. Petersen Oracle Linux Engineering
