linux-kernel - Re: [PATCH v2 2/4] iommufd: Move iommufd_sw

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Message-ID: <Z8H8I5UTiLfGNESS@Asurada-Nvidia>
Date: Fri, 28 Feb 2025 10:10:43 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: <kevin.tian@...el.com>, <robin.murphy@....com>, <joro@...tes.org>,
	<will@...nel.org>, <iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] iommufd: Move iommufd_sw_msi and related
 functions to driver.c

On Fri, Feb 28, 2025 at 02:02:15PM -0400, Jason Gunthorpe wrote:
> On Fri, Feb 28, 2025 at 09:54:28AM -0800, Nicolin Chen wrote:
> > > Stubbed out too if CONFIG_IRQ_MSI_IOMMU ?
> > 
> > In that case, the other caller iommufd_group_setup_msi() could be
> > {
> > #if IS_ENABLED(CONFIG_IRQ_MSI_IOMMU)
> > 	....
> > 	iommufd_sw_msi_install();
> > 	...
> > #endif
> > 	return 0;
> > }
> > ?
> 
> Or a empty static inline
>  
> > > I'm still wondering if we should use a function pointer, how big was
> > > this compiled anyhow?
> > 
> > Hmm, you mean the size of driver.o? It's 192K (before) vs 212K
> > (after).
> 
> Yes, but use the 'size' command to measure before/after

Before:
   text	   data	    bss	    dec	    hex	filename
    722	     44	      0	    766	    2fe	drivers/iommu/iommufd/driver.o
After:
   text	   data	    bss	    dec	    hex	filename
   1888	    100	      0	   1988	    7c4	drivers/iommu/iommufd/driver.o

Thanks
Nicolin