Christophe Leroy c12ab8dbc4 powerpc/8xx: Fix Oops with STRICT_KERNEL_RWX without DEBUG_RODATA_TEST ... Until now, all tests involving CONFIG_STRICT_KERNEL_RWX were done with DEBUG_RODATA_TEST to check the result. But now that CONFIG_STRICT_KERNEL_RWX is selected by default, it came without CONFIG_DEBUG_RODATA_TEST and led to the following Oops [ 6.830908] Freeing unused kernel image (initmem) memory: 352K [ 6.840077] BUG: Unable to handle kernel data access on write at 0xc1285200 [ 6.846836] Faulting instruction address: 0xc0004b6c [ 6.851745] Oops: Kernel access of bad area, sig: 11 [#1] [ 6.857075] BE PAGE_SIZE=16K PREEMPT CMPC885 [ 6.861348] SAF3000 DIE NOTIFICATION [ 6.864830] CPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0-rc5-s3k-dev-02255-g2747d7b7916f #451 [ 6.873429] NIP: c0004b6c LR: c0004b60 CTR: 00000000 [ 6.878419] REGS: c902be60 TRAP: 0300 Not tainted (5.15.0-rc5-s3k-dev-02255-g2747d7b7916f) [ 6.886852] MSR: 00009032 <EE,ME,IR,DR,RI> CR: 53000335 XER: 8000ff40 [ 6.893564] DAR: c1285200 DSISR: 82000000 [ 6.893564] GPR00: 0c000000 c902bf20 c20f4000 08000000 00000001 04001f00 c1800000 00000035 [ 6.893564] GPR08: ff0001ff c1280000 00000002 c0004b60 00001000 00000000 c0004b1c 00000000 [ 6.893564] GPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 6.893564] GPR24: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 c1060000 [ 6.932034] NIP [c0004b6c] kernel_init+0x50/0x138 [ 6.936682] LR [c0004b60] kernel_init+0x44/0x138 [ 6.941245] Call Trace: [ 6.943653] [c902bf20] [c0004b60] kernel_init+0x44/0x138 (unreliable) [ 6.950022] [c902bf30] [c001122c] ret_from_kernel_thread+0x5c/0x64 [ 6.956135] Instruction dump: [ 6.959060] 48ffc521 48045469 4800d8cd 3d20c086 89295fa0 2c090000 41820058 480796c9 [ 6.966890] 4800e48d 3d20c128 39400002 3fe0c106 <91495200> 3bff8000 4806fa1d 481f7d75 [ 6.974902] ---[ end trace 1e397bacba4aa610 ]--- 0xc1285200 corresponds to 'system_state' global var that the kernel is trying to set to SYSTEM_RUNNING. This var is above the RO/RW limit so it shouldn't Oops. It oopses because the dirty bit is missing. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/3d5800b0bbcd7b19761b98f50421358667b45331.1635520232.git.christophe.leroy@csgroup.eu		2021-11-01 21:39:03 +11:00
..
boot	powerpc/boot: Set LC_ALL=C in wrapper script	2021-10-27 22:31:22 +11:00
configs	powerpc/64s: Default to 64K pages for 64 bit book3s	2021-10-27 22:31:22 +11:00
crypto
include	Merge branch 'topic/ppc-kvm' into next	2021-10-29 00:00:57 +11:00
kernel	powerpc/8xx: Fix Oops with STRICT_KERNEL_RWX without DEBUG_RODATA_TEST	2021-11-01 21:39:03 +11:00
kexec	powerpc/machdep: Remove stale functions from ppc_md structure	2021-10-22 15:22:05 +11:00
kvm	Merge branch 'topic/ppc-kvm' into next	2021-10-29 00:00:57 +11:00
lib	powerpc/security: Use a mutex for interrupt exit code patching	2021-10-28 17:23:58 +11:00
math-emu	powerpc/64s: avoid reloading (H)SRR registers if they are still valid	2021-06-25 00:06:55 +10:00
mm	powerpc: Don't provide __kernel_map_pages() without ARCH_SUPPORTS_DEBUG_PAGEALLOC	2021-10-29 11:10:43 +11:00
net	powerpc/bpf: Fix write protecting JIT code	2021-10-28 00:08:32 +11:00
perf	powerpc/perf: Fix cycles/instructions as PM_CYC/PM_INST_CMPL in power10	2021-10-14 21:46:45 +11:00
platforms	powerpc/powernv/prd: Unregister OPAL_MSG_PRD2 notifier during module unload	2021-10-29 16:47:32 +11:00
purgatory	powerpc/kexec: Don't use .machine ppc64 in trampoline_64.S	2021-04-08 21:17:43 +10:00
sysdev	powerpc/dcr: Use cmplwi instead of 3-argument cmpli	2021-10-28 22:29:25 +11:00
tools	powerpc/head_check: Fix shellcheck errors	2021-08-17 22:52:02 +10:00
xmon	powerpc/xmon: fix task state output	2021-10-28 22:32:03 +11:00
Kbuild
Kconfig	powerpc/64s: Default to 64K pages for 64 bit book3s	2021-10-27 22:31:22 +11:00
Kconfig.debug	powerpc/ptdump: Convert powerpc to GENERIC_PTDUMP	2021-08-25 13:35:48 +10:00
Makefile	powerpc: Add "-z notext" flag to disable diagnostic	2021-08-15 13:49:39 +10:00
Makefile.postlink