Thanks to the nested inlining, all drivers correctly calling dma_mapping_error() after a mapping a page or single buffer generate two calls to get_arch_dma_ops() per callsite, which all adds up to a fair old chunk of useless code, e.g. ~3KB for an arm64 defconfig plus extras:
text data bss dec hex filename 13051391 1503898 327768 14883057 e318f1 vmlinux.o.old 13050751 1503898 327768 14882417 e31671 vmlinux.o.new Give the compiler a hand by making it clear we want the same ops. Signed-off-by: Robin Murphy <robin.mur...@arm.com> --- include/linux/dma-mapping.h | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 843ab866e0f4..239e53d12ee8 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -541,10 +541,11 @@ static inline void dma_free_noncoherent(struct device *dev, size_t size, static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) { - debug_dma_mapping_error(dev, dma_addr); + const struct dma_map_ops *ops = get_dma_ops(dev); - if (get_dma_ops(dev)->mapping_error) - return get_dma_ops(dev)->mapping_error(dev, dma_addr); + debug_dma_mapping_error(dev, dma_addr); + if (ops->mapping_error) + return ops->mapping_error(dev, dma_addr); return 0; } -- 2.12.2.dirty