Re: [PATCH v14 3/4] arm64: Use generic TIF bits for common thread flags

[Jinjie Ruan]

On 2026/4/1 18:55, Catalin Marinas wrote:
> On Fri, Mar 20, 2026 at 06:42:21PM +0800, Jinjie Ruan wrote:
>> Use the generic TIF bits defined in <asm-generic/thread_info_tif.h> for
>> standard thread flags (TIF_SIGPENDING, TIF_NEED_RESCHED, TIF_NOTIFY_RESUME,
>> TIF_RESTORE_SIGMASK, TIF_SINGLESTEP, etc.) instead of defining
>> them locally.
>>
>> Arm64-specific bits (TIF_FOREIGN_FPSTATE, TIF_MTE_ASYNC_FAULT, TIF_SVE,
>> TIF_SSBD, etc.) are renumbered to start at bit 16 to avoid conflicts.
>>
>> This enables RSEQ optimizations which require CONFIG_HAVE_GENERIC_TIF_BITS
>> combined with the generic entry infrastructure (already used by arm64).
>>
>> By the way, remove TIF_FREEZE because this flag became unused since
>> commit d88e4cb67197 ("freezer: remove now unused TIF_FREEZE").
>>
>> Cc: Thomas Gleixner <tglx@xxxxxxxxxx>
>> Reviewed-by: Kevin Brodsky <kevin.brodsky@xxxxxxx>
>> Reviewed-by: Linus Walleij <linusw@xxxxxxxxxx>
>> Reviewed-by: Yeoreum Yun <yeoreum.yun@xxxxxxx>
>> Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
> 
> Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
> 
> Given that it's touching multiple trees, I guess it's a series for
> Andrew?

Yes, this series touches x86, arm64, s390 and loongarch. It's best for
Andrew to help merge this in the -mm tree.

Moreover, the latter two arm64-related patches depend on patch serise
"arm64:
entry: Convert to Generic Entry" v14 being merged first, while the first
two patches can be merged in advance.

>