I am working on implementing SMP support in Linux kernel for Marvell PXA2128 ARM SoC. I am using Linus Torvald kernel as base kernel. Kernel version is 3.5. I have added SMP support in Linux kernel, I am able to boot with the second core but sometimes my kernel crashes with "Attempted to kill Init" message, that is, init process of initramfs dies somehow, don't know why. I thought L1 cache of second core is corrupted, so I invalidated the L1 cache of second core before it enters the Linux kernel execution. Crash log of kernel is like
[ 16.413024] Freeing init memory: 268K
[ 16.658111] tmpfs: No value for mount option 'strictatime'
[ 16.809997] scsi 0:0:0:0: Direct-Access SanDisk Cruzer Blade 1.27 PQ: 0 ANSI: 6
[ 16.827545] tmpfs: No value for mount option 'strictatime'
[ 16.972473] sd 0:0:0:0: Attached scsi generic sg0 type 0
[ 16.972930] sd 0:0:0:0: [sda] 15330304 512-byte logical blocks: (7.84 GB/7.30 GiB)
[ 16.974487] sd 0:0:0:0: [sda] Write Protect is off
[ 16.976104] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 17.369537] sda: sda1 sda2
[ 17.377258] sd 0:0:0:0: [sda] Attached SCSI removable disk
[ 17.602966] tmpfs: No value for mount option 'strictatime'
[ 18.074981] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000100
[ 18.074981]
[ 18.222442] [<c001691c>] (unwind_backtrace+0x0/0x128) from [<c046beb0>] (dump_stack+0x20/0x24)
[ 18.301177] [<c046beb0>] (dump_stack+0x20/0x24) from [<c046bfcc>] (panic+0x94/0x1d4)
[ 18.378265] [<c046bfcc>] (panic+0x94/0x1d4) from [<c002ad08>] (do_exit+0x390/0x7ac)
[ 18.454956] [<c002ad08>] (do_exit+0x390/0x7ac) from [<c002b37c>] (do_group_exit+0x0/0xc4)
[ 18.533111] CPU0: stopping
[ 18.605621] [<c001691c>] (unwind_backtrace+0x0/0x128) from [<c046beb0>] (dump_stack+0x20/0x24)
[ 18.687225] [<c046beb0>] (dump_stack+0x20/0x24) from [<c00145ac>] (handle_IPI+0x104/0x174)
[ 18.770141] [<c00145ac>] (handle_IPI+0x104/0x174) from [<c0008590>] (gic_handle_irq+0x60/0x68)
[ 18.854888] [<c0008590>] (gic_handle_irq+0x60/0x68) from [<c000e6c0>] (__irq_svc+0x40/0x70)
[ 18.940093] Exception stack(0xc0685f38 to 0xc0685f80)
[ 19.022155] 5f20: c06c4c28 a0000093
[ 19.108398] 5f40: 00000001 60400100 c0684000 c06c48c8 c047560c c0691438 c177a080 562f5842
[ 19.188018] SMP: failed to stop secondary CPUs
[ 19.275970] 5f60: 00000000 c0685f9c c0685f40 c0685f80 c0020668 c0010068 60000013 ffffffff
[ 19.363708] [<c000e6c0>] (__irq_svc+0x40/0x70) from [<c0010068>] (cpu_idle+0x94/0xdc)
[ 19.450805] [<c0010068>] (cpu_idle+0x94/0xdc) from [<c0462d24>] (rest_init+0x7c/0x94)
[ 19.537292] [<c0462d24>] (rest_init+0x7c/0x94) from [<c063f89c>] (start_kernel+0x328/0x380)
Now when my kernel boots successfully, the output of cat /proc/interrupts is like
bash-4.2# cat /proc/interrupts
CPU0 CPU1
39: 101 0 GIC pxa_i2c-i2c
45: 0 26692 GIC timer0
46: 26578 0 GIC timer1
52: 27 0 GIC olpc-ec-1.75
58: 0 0 GIC mmp-vmeta
60: 1142 0 GIC UART3
71: 0 0 GIC mmc2
72: 0 0 GIC olpc-kbd
73: 25978 0 GIC pxa168fb-dss
76: 2282 0 GIC ehci_hcd:usb1
84: 246 0 GIC mmc0
85: 9820 0 GIC mmc1
132: 0 0 ICU rtc Alrm
133: 0 0 ICU rtc 1Hz
137: 0 0 ICU galcore interrupt service
139: 88 0 ICU galcore interrupt service for 2D
141: 20 0 ICU pxa_i2c-i2c
143: 0 0 ICU pxa_i2c-i2c
145: 328 0 ICU pxa_i2c-i2c
186: 52 0 ICU mmc3
252: 0 0 GPIO hsdet-gpio
253: 0 0 GPIO hdmi-hpd
270: 0 0 GPIO d4280000.sdhci cd
278: 0 0 GPIO sdhci_wakeup_irq, sdhci_wakeup_irq, sdhci_wakeup_irq, sdhci_wakeup_irq
335: 0 0 GPIO micdet-gpio
365: 0 0 GPIO DCON
368: 0 0 GPIO olpc-switch-1.75-lid
369: 0 0 GPIO olpc-switch-1.75-ebook
393: 0 0 GPIO olpc-ec-1.75-wake
IPI0: 0 0 Timer broadcast interrupts
IPI1: 3508 4069 Rescheduling interrupts
IPI2: 0 0 Function call interrupts
IPI3: 7 429 Single function call interrupts
IPI4: 0 0 CPU stop interrupts
Err: 0
bash-4.2#
Please give me a clue what important I am missing in SMP implementation.
