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21d3722c40
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After observation that timer interrupt 7 always fires on secondary VPEs
the counter was disabled in the startup code. This is a bad idea when
building the kernel with jitterentropy. To generate entropy it makes use
of function random_get_entropy(). On MIPS architecture this simply reads
the counter register on the current core. With a disabled counter it
always returns the same value and the entropy initialization stalls the
core if it runs on a secondary VPE. See backtrace
[ 21.736246] rcu: INFO: rcu_sched self-detected stall on CPU
[ 21.736246] rcu: INFO: rcu_sched self-detected stall on CPU
[ 21.748594] rcu: 1-....: (2100 ticks this GP) idle=064c/1/0x40000002 softirq=7/7 fqs=1050
[ 21.748594] rcu: 1-....: (2100 ticks this GP) idle=064c/1/0x40000002 softirq=7/7 fqs=1050
[ 21.766871] rcu: (t=2102 jiffies g=-1187 q=25 ncpus=2)
[ 21.766871] rcu: (t=2102 jiffies g=-1187 q=25 ncpus=2)
[ 21.778429] CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.39 #482
[ 21.778429] CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.39 #482
[ 21.778461] Hardware name: Zyxel GS1900-48
[ 21.778461] Hardware name: Zyxel GS1900-48
...
[ 21.779757] [<8029b968>] jent_measure_jitter+0xc8/0x10c
[ 21.779757] [<8029b968>] jent_measure_jitter+0xc8/0x10c
[ 21.779779] [<8029b9e8>] jent_gen_entropy+0x3c/0xb0
[ 21.779779] [<8029b9e8>] jent_gen_entropy+0x3c/0xb0
[ 21.779800] [<8029bcc0>] jent_entropy_collector_alloc+0x104/0x118
[ 21.779800] [<8029bcc0>] jent_entropy_collector_alloc+0x104/0x118
[ 21.779822] [<8029bd6c>] jent_entropy_init+0x4c/0x2ec
[ 21.779822] [<8029bd6c>] jent_entropy_init+0x4c/0x2ec
[ 21.779844] [<8086f184>] jent_mod_init+0x58/0xac
[ 21.779844] [<8086f184>] jent_mod_init+0x58/0xac
[ 21.779865] [<80100200>] do_one_initcall+0x70/0x250
[ 21.779865] [<80100200>] do_one_initcall+0x70/0x250
[ 21.779883] [<8085c018>] kernel_init_freeable+0x1f0/0x280
[ 21.779883] [<8085c018>] kernel_init_freeable+0x1f0/0x280
[ 21.779905] [<8067cba4>] kernel_init+0x20/0xb0
[ 21.779905] [<8067cba4>] kernel_init+0x20/0xb0
[ 21.779926] [<80101158>] ret_from_kernel_thread+0x14/0x1c
[ 21.779926] [<80101158>] ret_from_kernel_thread+0x14/0x1c
This bit of entropy is helpful on these low end devices. Reenable the
counter and simply disable the interrupt.
Fixes:
|
||
|---|---|---|
| .. | ||
| airoha | ||
| apm821xx | ||
| armsr | ||
| at91 | ||
| ath79 | ||
| bcm27xx | ||
| bcm47xx | ||
| bcm53xx | ||
| bcm4908 | ||
| bmips | ||
| d1 | ||
| gemini | ||
| generic | ||
| imx | ||
| ipq40xx | ||
| ipq806x | ||
| ixp4xx | ||
| kirkwood | ||
| lantiq | ||
| layerscape | ||
| loongarch64 | ||
| malta | ||
| mediatek | ||
| mpc85xx | ||
| mvebu | ||
| mxs | ||
| octeon | ||
| omap | ||
| pistachio | ||
| qoriq | ||
| qualcommax | ||
| qualcommbe | ||
| ramips | ||
| realtek | ||
| rockchip | ||
| sifiveu | ||
| siflower | ||
| starfive | ||
| stm32 | ||
| sunxi | ||
| tegra | ||
| uml | ||
| x86 | ||
| zynq | ||
| Makefile | ||