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| author | Jason A. Donenfeld <[email protected]> | 2022-10-10 09:06:07 -0600 |
|---|---|---|
| committer | Herbert Xu <[email protected]> | 2022-10-14 19:03:09 +0800 |
| commit | 96cb9d0554457086664d3bd10630b11193d863f1 (patch) | |
| tree | ca4c2cd1bc899901090990c1149ea0fab9cc2d10 /tools/testing/radix-tree/generated/autoconf.h | |
| parent | b411b1a0c8bddd470fc8c3457629ac25a168cba0 (diff) | |
hwrng: bcm2835 - use hwrng_msleep() instead of cpu_relax()
Rather than busy looping, yield back to the scheduler and sleep for a
bit in the event that there's no data. This should hopefully prevent the
stalls that Mark reported:
<6>[ 3.362859] Freeing initrd memory: 16196K
<3>[ 23.160131] rcu: INFO: rcu_sched self-detected stall on CPU
<3>[ 23.166057] rcu: 0-....: (2099 ticks this GP) idle=03b4/1/0x40000002 softirq=28/28 fqs=1050
<4>[ 23.174895] (t=2101 jiffies g=-1147 q=2353 ncpus=4)
<4>[ 23.180203] CPU: 0 PID: 49 Comm: hwrng Not tainted 6.0.0 #1
<4>[ 23.186125] Hardware name: BCM2835
<4>[ 23.189837] PC is at bcm2835_rng_read+0x30/0x6c
<4>[ 23.194709] LR is at hwrng_fillfn+0x71/0xf4
<4>[ 23.199218] pc : [<c07ccdc8>] lr : [<c07cb841>] psr: 40000033
<4>[ 23.205840] sp : f093df70 ip : 00000000 fp : 00000000
<4>[ 23.211404] r10: c3c7e800 r9 : 00000000 r8 : c17e6b20
<4>[ 23.216968] r7 : c17e6b64 r6 : c18b0a74 r5 : c07ccd99 r4 : c3f171c0
<4>[ 23.223855] r3 : 000fffff r2 : 00000040 r1 : c3c7e800 r0 : c3f171c0
<4>[ 23.230743] Flags: nZcv IRQs on FIQs on Mode SVC_32 ISA Thumb Segment none
<4>[ 23.238426] Control: 50c5387d Table: 0020406a DAC: 00000051
<4>[ 23.244519] CPU: 0 PID: 49 Comm: hwrng Not tainted 6.0.0 #1
Link: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Jason A. Donenfeld <[email protected]>
Acked-by: Florian Fainelli <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
Diffstat (limited to 'tools/testing/radix-tree/generated/autoconf.h')
0 files changed, 0 insertions, 0 deletions