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dma_buf_ops are not supposed to change at runtime. All functions working with dma_buf_ops provided by <linux/dma-buf.h> work with const dma_buf_ops. So mark the non-const structs as const. File size before: text data bss dec hex filename 1240 112 0 1352 548 drivers/gpu/drm/omapdrm/omap_gem_dmabuf.o File size After adding 'const': text data bss dec hex filename 1352 0 0 1352 548 drivers/gpu/drm/omapdrm/omap_gem_dmabuf.o Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>