Tiezhu Yang 1cab5bd69e MIPS: Fix using smp_processor_id() in preemptible in show_cpuinfo() ... There exists the following issue under DEBUG_PREEMPT: BUG: using smp_processor_id() in preemptible [00000000] code: systemd/1 caller is show_cpuinfo+0x460/0xea0 ... Call Trace: [<ffffffff8020f0dc>] show_stack+0x94/0x128 [<ffffffff80e6cab4>] dump_stack_lvl+0x94/0xd8 [<ffffffff80e74c5c>] check_preemption_disabled+0x104/0x110 [<ffffffff802209c8>] show_cpuinfo+0x460/0xea0 [<ffffffff80539d54>] seq_read_iter+0xfc/0x4f8 [<ffffffff804fcc10>] new_sync_read+0x110/0x1b8 [<ffffffff804ff57c>] vfs_read+0x1b4/0x1d0 [<ffffffff804ffb18>] ksys_read+0xd0/0x110 [<ffffffff8021c090>] syscall_common+0x34/0x58 We can see the following call trace: show_cpuinfo() cpu_has_fpu current_cpu_data smp_processor_id() $ addr2line -f -e vmlinux 0xffffffff802209c8 show_cpuinfo arch/mips/kernel/proc.c:188 $ head -188 arch/mips/kernel/proc.c | tail -1 if (cpu_has_fpu) arch/mips/include/asm/cpu-features.h # define cpu_has_fpu (current_cpu_data.options & MIPS_CPU_FPU) arch/mips/include/asm/cpu-info.h #define current_cpu_data cpu_data[smp_processor_id()] Based on the above analysis, fix the issue by using raw_cpu_has_fpu which calls raw_smp_processor_id() in show_cpuinfo(). Fixes: 626bfa0372 ("MIPS: kernel: proc: add CPU option reporting") Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>		2021-11-25 16:45:58 +01:00
..
syscalls	MIPS: syscalls: Wire up futex_waitv syscall	2021-11-16 09:25:48 +01:00
.gitignore
access-helper.h
asm-offsets.c
bmips_5xxx_init.S
bmips_vec.S
branch.c
cacheinfo.c
cevt-bcm1480.c
cevt-ds1287.c
cevt-gt641xx.c
cevt-r4k.c
cevt-sb1250.c
cevt-txx9.c
cmpxchg.c
cps-vec-ns16550.S
cps-vec.S
cpu-probe.c
cpu-r3k-probe.c
crash.c
crash_dump.c
csrc-bcm1480.c
csrc-ioasic.c
csrc-r4k.c
csrc-sb1250.c
early_printk.c
early_printk_8250.c
elf.c
entry.S
fpu-probe.c
fpu-probe.h
ftrace.c
genex.S
gpio_txx9.c
head.S
i8253.c
idle.c
irq-gt641xx.c
irq-msc01.c
irq.c
irq_txx9.c
jump_label.c
kgdb.c
kprobes.c
linux32.c
machine_kexec.c
Makefile
mcount.S
mips-cm.c
mips-cpc.c
mips-mt-fpaff.c
mips-mt.c
mips-r2-to-r6-emul.c
module.c
octeon_switch.S
perf_event.c
perf_event_mipsxx.c
perf_regs.c
pm-cps.c
pm.c
probes-common.h
proc.c	MIPS: Fix using smp_processor_id() in preemptible in show_cpuinfo()	2021-11-25 16:45:58 +01:00
process.c
prom.c
ptrace.c
ptrace32.c
r4k-bugs64.c
r4k_fpu.S
r4k_switch.S
r2300_fpu.S
r2300_switch.S
relocate.c
relocate_kernel.S
reset.c
rtlx-cmp.c
rtlx-mt.c
rtlx.c
scall32-o32.S
scall64-n32.S
scall64-n64.S
scall64-o32.S
segment.c
setup.c
signal-common.h
signal.c
signal32.c
signal_n32.c
signal_o32.c
smp-bmips.c
smp-cmp.c
smp-cps.c
smp-mt.c
smp-up.c
smp.c
spinlock_test.c
spram.c
stacktrace.c
sync-r4k.c
syscall.c
sysrq.c
time.c
topology.c
traps.c
unaligned.c
uprobes.c
vdso.c
vmlinux.lds.S
vpe-cmp.c
vpe-mt.c
vpe.c
watch.c