lkml.org 
[lkml]   [2021]   [May]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH v6 02/21] arm64: Allow mismatched 32-bit EL0 support
    On 05/18/21 10:47, Will Deacon wrote:
    > When confronted with a mixture of CPUs, some of which support 32-bit
    > applications and others which don't, we quite sensibly treat the system
    > as 64-bit only for userspace and prevent execve() of 32-bit binaries.
    >
    > Unfortunately, some crazy folks have decided to build systems like this
    > with the intention of running 32-bit applications, so relax our
    > sanitisation logic to continue to advertise 32-bit support to userspace
    > on these systems and track the real 32-bit capable cores in a cpumask
    > instead. For now, the default behaviour remains but will be tied to
    > a command-line option in a later patch.
    >
    > Signed-off-by: Will Deacon <will@kernel.org>
    > ---
    > arch/arm64/include/asm/cpucaps.h | 3 +-

    Heads up. I just tried to apply this on 5.13-rc2 and it failed because cpucaps.
    was removed; it's autogenerated now.

    See commit 0c6c2d3615ef: ()"arm64: Generate cpucaps.h")

    Cheers

    --
    Qais Youesf

    \
     
     \ /
      Last update: 2021-05-21 17:23    [W:2.927 / U:0.220 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site