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[ Upstream commitb0b4518c99] Change the 'ret' variable in blk_stack_limits() from unsigned int to int, as it needs to store negative value -1. Storing the negative error codes in unsigned type, or performing equality comparisons (e.g., ret == -1), doesn't cause an issue at runtime [1] but can be confusing. Additionally, assigning negative error codes to unsigned type may trigger a GCC warning when the -Wsign-conversion flag is enabled. No effect on runtime. Link: https://lore.kernel.org/all/x3wogjf6vgpkisdhg3abzrx7v7zktmdnfmqeih5kosszmagqfs@oh3qxrgzkikf/ #1 Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com> Reviewed-by: John Garry <john.g.garry@oracle.com> Fixes:fe0b393f2c("block: Correct handling of bottom device misaligment") Reviewed-by: Bart Van Assche <bvanassche@acm.org> Link: https://lore.kernel.org/r/20250902130930.68317-1-rongqianfeng@vivo.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>