CVE-2023-53859

In the Linux kernel, the following vulnerability has been resolved:

s390/idle: mark archcpuidle() noinstr

linux-next commit ("cpuidle: tracing: Warn about !rcuiswatching()") adds a new warning which hits on s390's archcpuidle() function:

RCU not on for: archcpuidle+0x0/0x28 WARNING: CPU: 2 PID: 0 at include/linux/tracerecursion.h:162 archftraceopslistfunc+0x24c/0x258 Modules linked in: CPU: 2 PID: 0 Comm: swapper/2 Not tainted 6.2.0-rc6-next-20230202 #4 Hardware name: IBM 8561 T01 703 (z/VM 7.3.0) Krnl PSW : 0404d00180000000 00000000002b55c0 (archftraceopslist_func+0x250/0x258) R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:1 PM:0 RI:0 EA:3 Krnl GPRS: c0000000ffffbfff 0000000080000002 0000000000000026 0000000000000000 0000037ffffe3a28 0000037ffffe3a20 0000000000000000 0000000000000000 0000000000000000 0000000000f4acf6 00000000001044f0 0000037ffffe3cb0 0000000000000000 0000000000000000 00000000002b55bc 0000037ffffe3bb8 Krnl Code: 00000000002b55b0: c02000840051 larl %r2,0000000001335652 00000000002b55b6: c0e5fff512d1 brasl %r14,0000000000157b58 #00000000002b55bc: af000000 mc 0,0

00000000002b55c0: a7f4ffe7 brc 15,00000000002b558e 00000000002b55c4: 0707 bcr 0,%r7 00000000002b55c6: 0707 bcr 0,%r7 00000000002b55c8: eb6ff0480024 stmg %r6,%r15,72(%r15) 00000000002b55ce: b90400ef lgr %r14,%r15 Call Trace: [<00000000002b55c0>] archftraceopslistfunc+0x250/0x258 ([<00000000002b55bc>] archftraceopslistfunc+0x24c/0x258) [<0000000000f5f0fc>] ftracecommon+0x1c/0x20 [<00000000001044f6>] archcpuidle+0x6/0x28 [<0000000000f4acf6>] defaultidlecall+0x76/0x128 [<00000000001cc374>] doidle+0xf4/0x1b0 [<00000000001cc6ce>] cpustartupentry+0x36/0x40 [<0000000000119d00>] smpstartsecondary+0x140/0x150 [<0000000000f5d2ae>] restartinthandler+0x6e/0x90

Mark archcpuidle() noinstr like all other architectures with CONFIGARCHWANTSNOINSTR (should) have it to fix this.