lkml.org 
[lkml]   [2018]   [Aug]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRe: framebuffer corruption due to overlapping stp instructions on arm64
    From
    Date
    On 08/03/2018 09:11 AM, Andrew Pinski wrote:
    > Yes fix Links not to use memcpy on the framebuffer.
    > It is undefined behavior to use device memory with memcpy.

    Some (de facto) ABIs require that it is supported, though. For example,
    the POWER string functions avoid unaligned loads and stores for this
    reason because the platform has the same issue with device memory. And
    yes, GCC will expand memcpy on POWER to something that is incompatible
    with device memory. 8-(

    If we don't want people to use memcpy, we probably need to provide a
    credible alternative.

    Thanks,
    Florian

    \
     
     \ /
      Last update: 2018-08-03 09:54    [W:4.977 / U:0.052 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site