does. Outside the locked region, reads need to be atomic.

* Reads that only happen during STW, where no writes can happen during
  STW, do not need to be atomic.

That said, the advice from the Go memory model stands: "Don't be
[too] clever." The performance of the runtime matters, but its
robustness matters more.

Unmanaged memory
================

	CMP	R3, $-1
	BNE	3(PC)
	MOVD	$0, R3			// crash on failure
	MOVD	R3, (R3)
	RET

TEXT runtime·madvise_trampoline(SB),NOSPLIT,$32
	MOVD	8(R3), R4		// arg 2 - len
	MOVW	16(R3), R5		// arg 3 - advice
	MOVD	0(R3), R3		// arg 1 - addr
	CALL	libc_madvise(SB)
	// ignore failure - maybe pages are locked
	RET

TEXT runtime·open_trampoline(SB),NOSPLIT,$32
	MOVW	8(R3), R4		// arg 2 - flags

 *
 * <h3>More information</h3>
 *
 * See <a href="https://github.com/google/guava/wiki/ConditionalFailuresExplained">Conditional
 * failures explained</a> in the Guava User Guide for advice on when this class should be used.
 *
 * @since 17.0
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public final class Verify {
  /**

}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func Madvise(b []byte, advice int) (err error) {
	var _p0 unsafe.Pointer
	if len(b) > 0 {
		_p0 = unsafe.Pointer(&b[0])
	} else {
		_p0 = unsafe.Pointer(&_zero)
	}
	_, _, e1 := Syscall(SYS_MADVISE, uintptr(_p0), uintptr(len(b)), uintptr(advice))
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

//sys	ExtattrDeleteLink(link string, attrnamespace int, attrname string) (err error)
//sys	ExtattrListLink(link string, attrnamespace int, data uintptr, nbytes int) (ret int, err error)
//sys	Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_POSIX_FADVISE
//sys	Faccessat(dirfd int, path string, mode uint32, flags int) (err error)
//sys	Fchdir(fd int) (err error)
//sys	Fchflags(fd int, flags int) (err error)

	CMP	$-1, R0
	BNE	3(PC)
	MOVD	$0, R0			// crash on failure
	MOVD	R0, (R0)
	RET

TEXT runtime·madvise_trampoline(SB), NOSPLIT, $0
	MOVD	8(R0), R1		// arg 2 - len
	MOVW	16(R0), R2		// arg 3 - advice
	MOVD	0(R0), R0		// arg 1 - addr
	CALL	libc_madvise(SB)
	// ignore failure - maybe pages are locked
	RET

TEXT runtime·open_trampoline(SB),NOSPLIT,$0
	MOVW	8(R0), R1		// arg 2 - flags

}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func Madvise(b []byte, advice int) (err error) {
	var _p0 unsafe.Pointer
	if len(b) > 0 {
		_p0 = unsafe.Pointer(&b[0])
	} else {
		_p0 = unsafe.Pointer(&_zero)
	}
	_, _, e1 := Syscall(SYS_MADVISE, uintptr(_p0), uintptr(len(b)), uintptr(advice))
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

	CALL	libc_munmap(SB)
	TESTQ	AX, AX
	JEQ	2(PC)
	MOVL	$0xf1, 0xf1  // crash
	RET

TEXT runtime·madvise_trampoline(SB), NOSPLIT, $0
	MOVQ	8(DI), SI	// arg 2 len
	MOVL	16(DI), DX	// arg 3 advice
	MOVQ	0(DI), DI	// arg 1 addr
	CALL	libc_madvise(SB)
	// ignore failure - maybe pages are locked
	RET

TEXT runtime·open_trampoline(SB),NOSPLIT,$0
	MOVL	8(DI), SI		// arg 2 - flags

}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func Madvise(b []byte, advice int) (err error) {
	var _p0 unsafe.Pointer
	if len(b) > 0 {
		_p0 = unsafe.Pointer(&b[0])
	} else {
		_p0 = unsafe.Pointer(&_zero)
	}
	_, _, e1 := Syscall(SYS_MADVISE, uintptr(_p0), uintptr(len(b)), uintptr(advice))
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func Madvise(b []byte, advice int) (err error) {
	var _p0 unsafe.Pointer
	if len(b) > 0 {
		_p0 = unsafe.Pointer(&b[0])
	} else {
		_p0 = unsafe.Pointer(&_zero)
	}
	_, _, e1 := Syscall(SYS_MADVISE, uintptr(_p0), uintptr(len(b)), uintptr(advice))
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}