Patch "i40e: Do not use WQ_MEM_RECLAIM flag for workqueue" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    i40e: Do not use WQ_MEM_RECLAIM flag for workqueue

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     i40e-do-not-use-wq_mem_reclaim-flag-for-workqueue.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 9c07014270e2b27e9e11c6ffdd3bfe1df6445374
Author: Sindhu Devale <sindhu.devale@xxxxxxxxx>
Date:   Tue Apr 23 11:27:17 2024 -0700

    i40e: Do not use WQ_MEM_RECLAIM flag for workqueue
    
    [ Upstream commit 2cc7d150550cc981aceedf008f5459193282425c ]
    
    Issue reported by customer during SRIOV testing, call trace:
    When both i40e and the i40iw driver are loaded, a warning
    in check_flush_dependency is being triggered. This seems
    to be because of the i40e driver workqueue is allocated with
    the WQ_MEM_RECLAIM flag, and the i40iw one is not.
    
    Similar error was encountered on ice too and it was fixed by
    removing the flag. Do the same for i40e too.
    
    [Feb 9 09:08] ------------[ cut here ]------------
    [  +0.000004] workqueue: WQ_MEM_RECLAIM i40e:i40e_service_task [i40e] is
    flushing !WQ_MEM_RECLAIM infiniband:0x0
    [  +0.000060] WARNING: CPU: 0 PID: 937 at kernel/workqueue.c:2966
    check_flush_dependency+0x10b/0x120
    [  +0.000007] Modules linked in: snd_seq_dummy snd_hrtimer snd_seq
    snd_timer snd_seq_device snd soundcore nls_utf8 cifs cifs_arc4
    nls_ucs2_utils rdma_cm iw_cm ib_cm cifs_md4 dns_resolver netfs qrtr
    rfkill sunrpc vfat fat intel_rapl_msr intel_rapl_common irdma
    intel_uncore_frequency intel_uncore_frequency_common ice ipmi_ssif
    isst_if_common skx_edac nfit libnvdimm x86_pkg_temp_thermal
    intel_powerclamp gnss coretemp ib_uverbs rapl intel_cstate ib_core
    iTCO_wdt iTCO_vendor_support acpi_ipmi mei_me ipmi_si intel_uncore
    ioatdma i2c_i801 joydev pcspkr mei ipmi_devintf lpc_ich
    intel_pch_thermal i2c_smbus ipmi_msghandler acpi_power_meter acpi_pad
    xfs libcrc32c ast sd_mod drm_shmem_helper t10_pi drm_kms_helper sg ixgbe
    drm i40e ahci crct10dif_pclmul libahci crc32_pclmul igb crc32c_intel
    libata ghash_clmulni_intel i2c_algo_bit mdio dca wmi dm_mirror
    dm_region_hash dm_log dm_mod fuse
    [  +0.000050] CPU: 0 PID: 937 Comm: kworker/0:3 Kdump: loaded Not
    tainted 6.8.0-rc2-Feb-net_dev-Qiueue-00279-gbd43c5687e05 #1
    [  +0.000003] Hardware name: Intel Corporation S2600BPB/S2600BPB, BIOS
    SE5C620.86B.02.01.0013.121520200651 12/15/2020
    [  +0.000001] Workqueue: i40e i40e_service_task [i40e]
    [  +0.000024] RIP: 0010:check_flush_dependency+0x10b/0x120
    [  +0.000003] Code: ff 49 8b 54 24 18 48 8d 8b b0 00 00 00 49 89 e8 48
    81 c6 b0 00 00 00 48 c7 c7 b0 97 fa 9f c6 05 8a cc 1f 02 01 e8 35 b3 fd
    ff <0f> 0b e9 10 ff ff ff 80 3d 78 cc 1f 02 00 75 94 e9 46 ff ff ff 90
    [  +0.000002] RSP: 0018:ffffbd294976bcf8 EFLAGS: 00010282
    [  +0.000002] RAX: 0000000000000000 RBX: ffff94d4c483c000 RCX:
    0000000000000027
    [  +0.000001] RDX: ffff94d47f620bc8 RSI: 0000000000000001 RDI:
    ffff94d47f620bc0
    [  +0.000001] RBP: 0000000000000000 R08: 0000000000000000 R09:
    00000000ffff7fff
    [  +0.000001] R10: ffffbd294976bb98 R11: ffffffffa0be65e8 R12:
    ffff94c5451ea180
    [  +0.000001] R13: ffff94c5ab5e8000 R14: ffff94c5c20b6e05 R15:
    ffff94c5f1330ab0
    [  +0.000001] FS:  0000000000000000(0000) GS:ffff94d47f600000(0000)
    knlGS:0000000000000000
    [  +0.000002] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [  +0.000001] CR2: 00007f9e6f1fca70 CR3: 0000000038e20004 CR4:
    00000000007706f0
    [  +0.000000] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
    0000000000000000
    [  +0.000001] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
    0000000000000400
    [  +0.000001] PKRU: 55555554
    [  +0.000001] Call Trace:
    [  +0.000001]  <TASK>
    [  +0.000002]  ? __warn+0x80/0x130
    [  +0.000003]  ? check_flush_dependency+0x10b/0x120
    [  +0.000002]  ? report_bug+0x195/0x1a0
    [  +0.000005]  ? handle_bug+0x3c/0x70
    [  +0.000003]  ? exc_invalid_op+0x14/0x70
    [  +0.000002]  ? asm_exc_invalid_op+0x16/0x20
    [  +0.000006]  ? check_flush_dependency+0x10b/0x120
    [  +0.000002]  ? check_flush_dependency+0x10b/0x120
    [  +0.000002]  __flush_workqueue+0x126/0x3f0
    [  +0.000015]  ib_cache_cleanup_one+0x1c/0xe0 [ib_core]
    [  +0.000056]  __ib_unregister_device+0x6a/0xb0 [ib_core]
    [  +0.000023]  ib_unregister_device_and_put+0x34/0x50 [ib_core]
    [  +0.000020]  i40iw_close+0x4b/0x90 [irdma]
    [  +0.000022]  i40e_notify_client_of_netdev_close+0x54/0xc0 [i40e]
    [  +0.000035]  i40e_service_task+0x126/0x190 [i40e]
    [  +0.000024]  process_one_work+0x174/0x340
    [  +0.000003]  worker_thread+0x27e/0x390
    [  +0.000001]  ? __pfx_worker_thread+0x10/0x10
    [  +0.000002]  kthread+0xdf/0x110
    [  +0.000002]  ? __pfx_kthread+0x10/0x10
    [  +0.000002]  ret_from_fork+0x2d/0x50
    [  +0.000003]  ? __pfx_kthread+0x10/0x10
    [  +0.000001]  ret_from_fork_asm+0x1b/0x30
    [  +0.000004]  </TASK>
    [  +0.000001] ---[ end trace 0000000000000000 ]---
    
    Fixes: 4d5957cbdecd ("i40e: remove WQ_UNBOUND and the task limit of our workqueue")
    Signed-off-by: Sindhu Devale <sindhu.devale@xxxxxxxxx>
    Reviewed-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@xxxxxxxxx>
    Reviewed-by: Mateusz Polchlopek <mateusz.polchlopek@xxxxxxxxx>
    Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@xxxxxxxxx>
    Tested-by: Robert Ganzynkowicz <robert.ganzynkowicz@xxxxxxxxx>
    Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
    Link: https://lore.kernel.org/r/20240423182723.740401-2-anthony.l.nguyen@xxxxxxxxx
    Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index a21fc92aa2725..54d3bd8ec5ea3 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -16778,7 +16778,7 @@ static int __init i40e_init_module(void)
 	 * since we need to be able to guarantee forward progress even under
 	 * memory pressure.
 	 */
-	i40e_wq = alloc_workqueue("%s", WQ_MEM_RECLAIM, 0, i40e_driver_name);
+	i40e_wq = alloc_workqueue("%s", 0, 0, i40e_driver_name);
 	if (!i40e_wq) {
 		pr_err("%s: Failed to create workqueue\n", i40e_driver_name);
 		return -ENOMEM;




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