Linus Torvalds writes: (Summary)
But since an unaligned stack pointer really shouldn't be an issue,
it's fine to not care.
it's fine to not care.
No again.
No again.
It does NOT depend on the CPU, since the only CPU's that are relevant to this patch are the ones that don't do 64-bit. The problem is between keyboard and chair, not in the kernel.
is between keyboard and chair, not in the kernel.
And absolutely *no* 32-bit-only CPU does "rep movs" really well. Some of them do it even worse than others (P4), but none of them do a great job.
job.
That said, none of them should do _such_ a shitty job that this will be in the least noticeable compared to all the crazy %cr3 stuff.
it's fine to not care.
[...]
It very much depends on the cpu.No again.
No again.
It does NOT depend on the CPU, since the only CPU's that are relevant to this patch are the ones that don't do 64-bit. The problem is between keyboard and chair, not in the kernel.
is between keyboard and chair, not in the kernel.
And absolutely *no* 32-bit-only CPU does "rep movs" really well. Some of them do it even worse than others (P4), but none of them do a great job.
job.
That said, none of them should do _such_ a shitty job that this will be in the least noticeable compared to all the crazy %cr3 stuff.