On 2016-10-27, at 2:39 PM, Helge Deller wrote:
> diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
> index 0a393a0..c04d946 100644
> --- a/arch/parisc/kernel/sys_parisc.c
> +++ b/arch/parisc/kernel/sys_parisc.c
> @@ -36,12 +36,11 @@
> #include <linux/personality.h>
> #include <linux/random.h>
>
> -/* we construct an artificial offset for the mapping based on the physical
> - * address of the kernel mapping variable */
> +/* keep track of the last mapping address offset in the private_data field */
> #define GET_LAST_MMAP(filp) \
> - (filp ? ((unsigned long) filp->f_mapping) >> 8 : 0UL)
> + (filp && (file_count(filp) > 0) ? (unsigned long) filp->private_data : 0UL)
> #define SET_LAST_MMAP(filp, val) \
> - { /* nothing */ }
> + { if (filp) filp->private_data = (void *) (val); }
In my testing, this causes hpmc's doing serial io.
Dave
--
John David Anglin dave.anglin@xxxxxxxx
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