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Bart Van Assche 035e9f4716 scsi: sbitmap: Silence a debug kernel warning triggered by sbitmap_put() 
All sbitmap code uses implied preemption protection to update
sb->alloc_hint except sbitmap_put(). Using implied preemption protection is
safe since the value of sb->alloc_hint only affects performance of sbitmap
allocations but not their correctness. Change this_cpu_ptr() in
sbitmap_put() into raw_cpu_ptr() to suppress the following kernel warning
that appears with preemption debugging enabled (CONFIG_DEBUG_PREEMPT):

BUG: using smp_processor_id() in preemptible [00000000] code: scsi_eh_0/152
caller is debug_smp_processor_id+0x17/0x20
CPU: 1 PID: 152 Comm: scsi_eh_0 Tainted: G        W         5.12.0-rc1-dbg+ #6
Call Trace:
 show_stack+0x52/0x58
 dump_stack+0xaf/0xf3
 check_preemption_disabled+0xce/0xd0
 debug_smp_processor_id+0x17/0x20
 scsi_device_unbusy+0x13a/0x1c0 [scsi_mod]
 scsi_finish_command+0x4d/0x290 [scsi_mod]
 scsi_eh_flush_done_q+0x1e7/0x280 [scsi_mod]
 ata_scsi_port_error_handler+0x592/0x750 [libata]
 ata_scsi_error+0x1a0/0x1f0 [libata]
 scsi_error_handler+0x19e/0x330 [scsi_mod]
 kthread+0x222/0x250
 ret_from_fork+0x1f/0x30

Link: https://lore.kernel.org/r/20210317032648.9080-1-bvanassche@acm.org
Fixes: c548e62bcf ("scsi: sbitmap: Move allocation hint into sbitmap")
Cc: Hannes Reinecke <hare@suse.de>
Cc: Omar Sandoval <osandov@fb.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2021-03-18 22:39:30 -04:00
..
acpi IOMMU Updates for Linux v5.12 2021-02-22 10:31:29 -08:00
asm-generic RISC-V Patches for the 5.12 Merge Window 2021-02-26 10:28:35 -08:00
clocksource
crypto Keyrings miscellany 2021-02-23 16:09:23 -08:00
drm drm/drm_vblank: set the dma-fence timestamp during send_vblank_event 2021-02-24 21:05:54 +05:30
dt-bindings RISC-V Patches for the 5.12 Merge Window 2021-02-26 10:28:35 -08:00
keys
kunit
kvm
linux scsi: sbitmap: Silence a debug kernel warning triggered by sbitmap_put() 2021-03-18 22:39:30 -04:00
math-emu
media Fixes around VM_FPNMAP and follow_pfn 2021-02-22 17:45:02 -08:00
memory
misc
net net: icmp: pass zeroed opts from icmp{,v6}_ndo_send before sending 2021-02-23 11:29:52 -08:00
pcmcia
ras
rdma
scsi scsi: core: Add mq_poll support to SCSI layer 2021-03-04 17:37:03 -05:00
soc RISC-V Patches for the 5.12 Merge Window 2021-02-26 10:28:35 -08:00
sound
target scsi: target: core: Make completion affinity configurable 2021-03-04 17:37:03 -05:00
trace scsi: ufs: Add exception event tracepoint 2021-03-04 17:36:58 -05:00
uapi io_uring-worker.v3-2021-02-25 2021-02-27 08:29:02 -08:00
vdso
video
xen xen/events: add per-xenbus device event statistics and settings 2021-02-23 10:07:11 -06:00