Re: [PATCH] regmap: rbtree: Use alloc_flags for memory allocations

[Mark Brown <broonie@kernel.org>]

On Fri, 21 Jul 2023 17:55:33 +0300, Dan Carpenter wrote:
> The kunit tests discovered a sleeping in atomic bug.  The allocations
> in the regcache-rbtree code should use the map->alloc_flags instead of
> GFP_KERNEL.
> 
> [    5.005510] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:306
> [    5.005960] in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 117, name: kunit_try_catch
> [    5.006219] preempt_count: 1, expected: 0
> [    5.006414] 1 lock held by kunit_try_catch/117:
> [    5.006590]  #0: 833b9010 (regmap_kunit:86:(config)->lock){....}-{2:2}, at: regmap_lock_spinlock+0x14/0x1c
> [    5.007493] irq event stamp: 162
> [    5.007627] hardirqs last  enabled at (161): [<80786738>] crng_make_state+0x1a0/0x294
> [    5.007871] hardirqs last disabled at (162): [<80c531ec>] _raw_spin_lock_irqsave+0x7c/0x80
> [    5.008119] softirqs last  enabled at (0): [<801110ac>] copy_process+0x810/0x2138
> [    5.008356] softirqs last disabled at (0): [<00000000>] 0x0
> [    5.008688] CPU: 0 PID: 117 Comm: kunit_try_catch Tainted: G                 N 6.4.4-rc3-g0e8d2fdfb188 #1
> [    5.009011] Hardware name: Generic DT based system
> [    5.009277]  unwind_backtrace from show_stack+0x18/0x1c
> [    5.009497]  show_stack from dump_stack_lvl+0x38/0x5c
> [    5.009676]  dump_stack_lvl from __might_resched+0x188/0x2d0
> [    5.009860]  __might_resched from __kmem_cache_alloc_node+0x1dc/0x25c
> [    5.010061]  __kmem_cache_alloc_node from kmalloc_trace+0x30/0xc8
> [    5.010254]  kmalloc_trace from regcache_rbtree_write+0x26c/0x468
> [    5.010446]  regcache_rbtree_write from _regmap_write+0x88/0x140
> [    5.010634]  _regmap_write from regmap_write+0x44/0x68
> [    5.010803]  regmap_write from basic_read_write+0x8c/0x270
> [    5.010980]  basic_read_write from kunit_try_run_case+0x48/0xa0
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git for-next

Thanks!

[1/1] regmap: rbtree: Use alloc_flags for memory allocations
      commit: 0c8b0bf42c8cef56f7cd9cd876fbb7ece9217064

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark