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, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>