x86, bts: fork and exit handling

Status from this message: applied to tip/tracing/hw-branch-tracer, thanks Markus! It's a nice

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#	Subject and files	Size	Replies	Applied
1/2	x86, bts: fork and exit handling`arch/x86/include/asm/ds.h` `arch/x86/include/asm/ptrace.h` `arch/x86/kernel/ds.c` +6 more	+121 ~~-32~~	1 reply
2/2	x86, bts: memory accounting`arch/x86/kernel/ptrace.c` `include/linux/mm.h` `mm/mlock.c`	+81 ~~-11~~	1 reply

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