forked from luck/tmp_suning_uos_patched
powerpc: Wire up restartable sequences system call
Wire up the rseq system call on powerpc. This provides an ABI improving the speed of a user-space getcpu operation on powerpc by skipping the getcpu system call on the fast path, as well as improving the speed of user-space operations on per-cpu data compared to using load-reservation/store-conditional atomics. Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Joel Fernandes <joelaf@google.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dave Watson <davejwatson@fb.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Paul Mackerras <paulus@samba.org> Cc: "H . Peter Anvin" <hpa@zytor.com> Cc: Chris Lameter <cl@linux.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Andrew Hunter <ahh@google.com> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: "Paul E . McKenney" <paulmck@linux.vnet.ibm.com> Cc: Paul Turner <pjt@google.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Ben Maurer <bmaurer@fb.com> Cc: linux-api@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: Andy Lutomirski <luto@amacapital.net> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lkml.kernel.org/r/20180602124408.8430-11-mathieu.desnoyers@efficios.com
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@ -392,3 +392,4 @@ SYSCALL(statx)
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SYSCALL(pkey_alloc)
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SYSCALL(pkey_free)
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SYSCALL(pkey_mprotect)
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SYSCALL(rseq)
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@ -12,7 +12,7 @@
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#include <uapi/asm/unistd.h>
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#define NR_syscalls 387
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#define NR_syscalls 388
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#define __NR__exit __NR_exit
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@ -398,5 +398,6 @@
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#define __NR_pkey_alloc 384
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#define __NR_pkey_free 385
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#define __NR_pkey_mprotect 386
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#define __NR_rseq 387
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#endif /* _UAPI_ASM_POWERPC_UNISTD_H_ */
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