[RFC PATCH v3 1/1] arch: arm64: Implement unaligned atomic emulation

[André Almeida]

Hi Will, thanks for the quickly reply,

Em 30/09/2026 04:48, Will Deacon escreveu:
> On Tue, Sep 29, 2026 at 11:01:38PM -0300, André Almeida wrote:
>> Implement support for emulating unaligned atomic operations on arm64.
>> User applications that wish to enable support for this should use the
>> pctrl() flag `PR_ARM64_UNALIGN_ATOMIC_EMULATE`.
>>
>> Signed-off-by: André Almeida <andrealmeid at igalia.com>
>> ---
>>   arch/arm64/Kconfig                   |   6 +
>>   arch/arm64/include/asm/exception.h   |   1 +
>>   arch/arm64/include/asm/processor.h   |   5 +
>>   arch/arm64/include/asm/rwonce.h      |  14 +-
>>   arch/arm64/include/asm/thread_info.h |   1 +
>>   arch/arm64/kernel/Makefile           |   3 +-
>>   arch/arm64/kernel/process.c          |  15 +
>>   arch/arm64/kernel/unaligned_atomic.c | 521 +++++++++++++++++++++++++++
>>   arch/arm64/mm/fault.c                |  10 +
>>   include/uapi/linux/prctl.h           |   5 +
>>   kernel/sys.c                         |   7 +-
>>   11 files changed, 579 insertions(+), 9 deletions(-)
>>   create mode 100644 arch/arm64/kernel/unaligned_atomic.c
> 
> No.
> 
> I already explained to you why this doesn't work:
> 
> https://lore.kernel.org/r/aV1YnOetDHhKe4hz@willie-the-truck

Indeed, last time you raised some points, and then Ryan replied them. Is 
there any specific point that doesn't work? I couldn't find a reply for 
Ryan's answers:

https://lore.kernel.org/all/CABnRqDf5EQUoXu=pJ6mj4-JfwAzEfcAE2cYrNzJANFycx7cMUA@mail.gmail.com/

> 
> Will