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The alloc_pages() cannot satisfy requests exceeding MAX_PAGE_ORDER, and attempting such allocations will lead to guaranteed failures and potential kernel warnings. For SMCR_PHYS_CONT_BUFS, cap the allocation order to MAX_PAGE_ORDER. This ensures the attempts to allocate the largest possible physically contiguous chunk succeed, instead of failing with an invalid order. This also avoids redundant "try-fail-degrade" cycles in __smc_buf_create(). For SMCR_MIXED_BUFS, no cap is needed: if the order exceeds MAX_PAGE_ORDER, alloc_pages() will silently fail (__GFP_NOWARN) and automatically fall back to virtual memory. Signed-off-by: D. Wythe <alibuda@linux.alibaba.com> Reviewed-by: Dust Li <dust.li@linux.alibaba.com> Reviewed-by: Simon Horman <horms@kernel.org> Reviewed-by: Sidraya Jayagond <sidraya@linux.ibm.com> Link: https://patch.msgid.link/20260429021637.21815-1-alibuda@linux.alibaba.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>