On 09/12/2015 14:55, Michal Hocko wrote: > On Tue 08-12-15 18:25:31, Sebastian Frias wrote: >> Hi, >> >> We are porting a driver from Linux 3.4.39+ to 4.1.13+, CPU is Cortex-A9. >> >> The driver maps kmalloc'ed memory to user space. > > This sounds like a terrible idea to me. Why don't you simply use the > page allocator directly? Try to imagine what would happen if you mmaped > a kmalloc with a size which is not page aligned? mmaped memory uses > whole page granularity.
According to the source code, this kernel module calls kmalloc(1 << 17, GFP_KERNEL | __GFP_REPEAT); I suppose kmalloc() would return page-aligned memory? (Note: the kernel module was originally written for 2.4 and was updated inconsistently over the years.) Regards. -- 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/
