Baoquan He <bhe@xxxxxxxxxx> writes: > ioremap_uc() is only meaningful on old x86-32 systems with the PAT > extension, and on ia64 with its slightly unconventional ioremap() > behavior, everywhere else this is the same as ioremap() anyway. > > Here, remove the ioremap_uc() definition in architecutures other > than x86 and ia64. These architectures all have asm-generic/io.h > included and will have the default ioremap_uc() definition which > returns NULL. > > Note: This changes the existing behaviour and could break code > calling ioremap_uc(). If any ARCH meets this breakage and really > needs a specific ioremap_uc() for its own usage, one ioremap_uc() > can be added in the ARCH. I see one use in: drivers/video/fbdev/aty/atyfb_base.c: par->ati_regbase = ioremap_uc(info->fix.mmio_start, 0x1000); Which isn't obviously x86/ia64 specific. I'm pretty sure some powermacs (powerpc) use that driver. Maybe that exact code path is only reachable on x86/ia64? But if so please explain why. Otherwise it looks like this series could break that driver on powerpc at least. cheers
