[PATCH v4 0/13] dmaengine: introduce sg_nents_for_dma() and convert users

[Andy Shevchenko]

On Tue, Dec 16, 2025 at 06:41:44PM +0530, Vinod Koul wrote:
> On 24-11-25, 13:09, Andy Shevchenko wrote:
> > A handful of the DMAengine drivers use same routine to calculate the number of
> > SG entries needed for the given DMA transfer. Provide a common helper for them
> > and convert.
> > 
> > I left the new helper on SG level of API because brief grepping shows potential
> > candidates outside of DMA engine, e.g.:
> > 
> >   drivers/crypto/chelsio/chcr_algo.c:154:  nents += DIV_ROUND_UP(less, entlen);
> >   drivers/spi/spi-stm32.c:1495:  /* Count the number of entries needed */
> > 
> > Changelog v4:
> > - fixed compilation errors (Vinod)
> 
> :-(
> 
> drivers/dma/altera-msgdma.c: In function ‘msgdma_prep_slave_sg’:
> drivers/dma/altera-msgdma.c:399:29: error: unused variable ‘sg’ [-Werror=unused-variable]
> 
> Clearly your script is not working. I am surprised that you are not able
> to compile these changes. Bit disappointed tbh!

This is W=1 build with WERROR=y, yet I agree that I must have tested this as
well. Sorry, I will do v5 with carefully tested all modules to be compiled
with `make W=1`.

-- 
With Best Regards,
Andy Shevchenko