* VFIO compile failure on i386 allmodconfig in linux-next
@ 2012-06-28 17:57 Paul Gortmaker
2012-06-28 22:25 ` Alex Williamson
0 siblings, 1 reply; 2+ messages in thread
From: Paul Gortmaker @ 2012-06-28 17:57 UTC (permalink / raw)
To: alex.williamson; +Cc: linux-next
Hi Alex,
Just a heads up that the i386 allmodconfig failed on VFIO, in case
you didn't see it.
http://kisskb.ellerman.id.au/kisskb/buildresult/6603285/
arch/x86/include/asm/uaccess_32.h:211:26: error: call to 'copy_from_user_overflow' declared with attribute error: copy_from_user() buffer size is not provably correct
make[4]: *** [drivers/vfio/pci/vfio_pci_config.o] Error 1
Paul.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: VFIO compile failure on i386 allmodconfig in linux-next
2012-06-28 17:57 VFIO compile failure on i386 allmodconfig in linux-next Paul Gortmaker
@ 2012-06-28 22:25 ` Alex Williamson
0 siblings, 0 replies; 2+ messages in thread
From: Alex Williamson @ 2012-06-28 22:25 UTC (permalink / raw)
To: Paul Gortmaker; +Cc: linux-next
On Thu, 2012-06-28 at 13:57 -0400, Paul Gortmaker wrote:
> Hi Alex,
>
> Just a heads up that the i386 allmodconfig failed on VFIO, in case
> you didn't see it.
>
> http://kisskb.ellerman.id.au/kisskb/buildresult/6603285/
>
> arch/x86/include/asm/uaccess_32.h:211:26: error: call to 'copy_from_user_overflow' declared with attribute error: copy_from_user() buffer size is not provably correct
> make[4]: *** [drivers/vfio/pci/vfio_pci_config.o] Error 1
Thank you for the report. This looks bogus to me, it's complaining
about a copy_from_user into an __le32 because it can't determine the
number of bytes to be copied. That number is a parameter to the
function, but the function is static and only called with values of 1, 2
or 4. I've added a test that seems to make the compiler happy, so this
will be fixed in tomorrow's tree. Thanks!
Alex
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