Messages in this thread | | | Date | Tue, 29 Mar 2016 07:23:31 -0500 | Subject | Re: [PATCH 0/3] nohz: Convert tick dependency mask to atomic_t | From | Linus Torvalds <> |
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On Tue, Mar 29, 2016 at 4:44 AM, Ingo Molnar <mingo@kernel.org> wrote: > > Harmonizing thread_info::flags does not look easy, given how much assembly code > accesses this field.
It might not be too bad.
For 32-bit architectures (which is still most of them), it's just a
unsigned int/long -> atomic_t
and for 64-bit architectures you end up with three choices:
- it's already 32-bit (alpha, ia64, x86):
unsigned int -> atomic_t
- little-endian long:
atomic_t flags unsigned int padding;
- big-endian long (only powerpc? Maybe there's a big-endian MIPS still?)
unsigned int padding; atomic_t flags;
so you could do that fairly mindlessly. You *could* even use a nasty macro from hell to do it automatically, with the above rules in some .
Then each architecture could clean itself up and get rid of the padding field if they want to.
Linus
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