On Wed, Oct 28, 2015 at 10:39 AM, Dan Williams <[email protected]> wrote: > Currently memremap checks if the range is "System RAM" and returns the > kernel linear address. This is broken for highmem platforms where a > range may be "System RAM", but is not part of the kernel linear mapping. > Similar to acpi_map(), use kmap() for PAGE_SIZE memremap() requests for > highmem, and fall back to ioremap_cache() otherwise. > > The impact of this bug is low for now since the pmem driver is the only > user of memremap(), but this is important to fix before more conversions > to memremap arrive in 4.4. > > Cc: Rafael J. Wysocki <[email protected]> > Cc: Russell King <[email protected]> > Reported-by: Ard Biesheuvel <[email protected]> > Signed-off-by: Dan Williams <[email protected]> > --- > Russell, > > I question whether the kmap fallback is needed. This is borrowed from > the current implementation of acpi_map(), and I added it since arm > ioremap warns if passed pfn_valid() addresses.
I flubbed the subject line... this is for 4.3-final. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
