From: Thomas Zimmermann
Sent: 12 May 2023 11:25
Cast I/O offsets to pointers to use them with I/O functions. The I/O
functions expect pointers of type 'volatile void __iomem *', but the
offsets are plain integers. Build warnings are
../drivers/video/fbdev/hitfb.c: In function 'hitfb_accel_wait':
../arch/x86/include/asm/hd64461.h:18:33: warning: passing argument 1 of 'fb_readw' makes pointer
from integer without a cast [-Wint-conversion]
18 | #define HD64461_IO_OFFSET(x) (HD64461_IOBASE + (x))
| ^~~~~~~~~~~~~~~~~~~~~~
...
52 | static inline u16 fb_readw(const volatile void __iomem *addr)
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
This patch only fixes the build warnings. It's not clear if the I/O
offsets can legally be passed to the I/O helpers. It was apparently
broken in 2007 when custom inw()/outw() helpers got removed by
commit 34a780a0afeb ("sh: hp6xx pata_platform support."). Fixing the
driver would require setting the I/O base address.
Did you try changing the definition of HD64461_IOBASE to include
a (volatile void __iomem *) cast?
A lot less churn...
I'm guessing that 'sh' deosn't have in/out instructions so this
is something that is always mapped at a fixed kernel virtual address?
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
