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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Taehee Yoo <ap420073@gmail.com>, Jakub Kicinski <kuba@kernel.org>,
	Sasha Levin <sashal@kernel.org>,
	netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 5.5 524/542] netdevsim: use __GFP_NOWARN to avoid memalloc warning
Date: Fri, 14 Feb 2020 10:48:36 -0500
Message-ID: <20200214154854.6746-524-sashal@kernel.org> (raw)
In-Reply-To: <20200214154854.6746-1-sashal@kernel.org>

From: Taehee Yoo <ap420073@gmail.com>

[ Upstream commit 83cf4213bafc4e3c747f0a25ad22cfbf55af7e84 ]

vfnum buffer size and binary_len buffer size is received by user-space.
So, this buffer size could be too large. If so, kmalloc will internally
print a warning message.
This warning message is actually not necessary for the netdevsim module.
So, this patch adds __GFP_NOWARN.

Test commands:
    modprobe netdevsim
    echo 1 > /sys/bus/netdevsim/new_device
    echo 1000000000 > /sys/devices/netdevsim1/sriov_numvfs

Splat looks like:
[  357.847266][ T1000] WARNING: CPU: 0 PID: 1000 at mm/page_alloc.c:4738 __alloc_pages_nodemask+0x2f3/0x740
[  357.850273][ T1000] Modules linked in: netdevsim veth openvswitch nsh nf_conncount nf_nat nf_conntrack nf_defrx
[  357.852989][ T1000] CPU: 0 PID: 1000 Comm: bash Tainted: G    B             5.5.0-rc5+ #270
[  357.854334][ T1000] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[  357.855703][ T1000] RIP: 0010:__alloc_pages_nodemask+0x2f3/0x740
[  357.856669][ T1000] Code: 64 fe ff ff 65 48 8b 04 25 c0 0f 02 00 48 05 f0 12 00 00 41 be 01 00 00 00 49 89 47 0
[  357.860272][ T1000] RSP: 0018:ffff8880b7f47bd8 EFLAGS: 00010246
[  357.861009][ T1000] RAX: ffffed1016fe8f80 RBX: 1ffff11016fe8fae RCX: 0000000000000000
[  357.861843][ T1000] RDX: 0000000000000000 RSI: 0000000000000017 RDI: 0000000000000000
[  357.862661][ T1000] RBP: 0000000000040dc0 R08: 1ffff11016fe8f67 R09: dffffc0000000000
[  357.863509][ T1000] R10: ffff8880b7f47d68 R11: fffffbfff2798180 R12: 1ffff11016fe8f80
[  357.864355][ T1000] R13: 0000000000000017 R14: 0000000000000017 R15: ffff8880c2038d68
[  357.865178][ T1000] FS:  00007fd9a5b8c740(0000) GS:ffff8880d9c00000(0000) knlGS:0000000000000000
[  357.866248][ T1000] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  357.867531][ T1000] CR2: 000055ce01ba8100 CR3: 00000000b7dbe005 CR4: 00000000000606f0
[  357.868972][ T1000] Call Trace:
[  357.869423][ T1000]  ? lock_contended+0xcd0/0xcd0
[  357.870001][ T1000]  ? __alloc_pages_slowpath+0x21d0/0x21d0
[  357.870673][ T1000]  ? _kstrtoull+0x76/0x160
[  357.871148][ T1000]  ? alloc_pages_current+0xc1/0x1a0
[  357.871704][ T1000]  kmalloc_order+0x22/0x80
[  357.872184][ T1000]  kmalloc_order_trace+0x1d/0x140
[  357.872733][ T1000]  __kmalloc+0x302/0x3a0
[  357.873204][ T1000]  nsim_bus_dev_numvfs_store+0x1ab/0x260 [netdevsim]
[  357.873919][ T1000]  ? kernfs_get_active+0x12c/0x180
[  357.874459][ T1000]  ? new_device_store+0x450/0x450 [netdevsim]
[  357.875111][ T1000]  ? kernfs_get_parent+0x70/0x70
[  357.875632][ T1000]  ? sysfs_file_ops+0x160/0x160
[  357.876152][ T1000]  kernfs_fop_write+0x276/0x410
[  357.876680][ T1000]  ? __sb_start_write+0x1ba/0x2e0
[  357.877225][ T1000]  vfs_write+0x197/0x4a0
[  357.877671][ T1000]  ksys_write+0x141/0x1d0
[ ... ]

Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Fixes: 79579220566c ("netdevsim: add SR-IOV functionality")
Fixes: 82c93a87bf8b ("netdevsim: implement couple of testing devlink health reporters")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/netdevsim/bus.c    | 2 +-
 drivers/net/netdevsim/health.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/netdevsim/bus.c b/drivers/net/netdevsim/bus.c
index e455dd1cf4d0a..7971dc4f54f15 100644
--- a/drivers/net/netdevsim/bus.c
+++ b/drivers/net/netdevsim/bus.c
@@ -29,7 +29,7 @@ static int nsim_bus_dev_vfs_enable(struct nsim_bus_dev *nsim_bus_dev,
 {
 	nsim_bus_dev->vfconfigs = kcalloc(num_vfs,
 					  sizeof(struct nsim_vf_config),
-					  GFP_KERNEL);
+					  GFP_KERNEL | __GFP_NOWARN);
 	if (!nsim_bus_dev->vfconfigs)
 		return -ENOMEM;
 	nsim_bus_dev->num_vfs = num_vfs;
diff --git a/drivers/net/netdevsim/health.c b/drivers/net/netdevsim/health.c
index 9aa637d162eb7..c06e0f8fbc102 100644
--- a/drivers/net/netdevsim/health.c
+++ b/drivers/net/netdevsim/health.c
@@ -82,7 +82,7 @@ static int nsim_dev_dummy_fmsg_put(struct devlink_fmsg *fmsg, u32 binary_len)
 	if (err)
 		return err;
 
-	binary = kmalloc(binary_len, GFP_KERNEL);
+	binary = kmalloc(binary_len, GFP_KERNEL | __GFP_NOWARN);
 	if (!binary)
 		return -ENOMEM;
 	get_random_bytes(binary, binary_len);
-- 
2.20.1


  parent reply index

Thread overview: 77+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200214154854.6746-1-sashal@kernel.org>
2020-02-14 15:39 ` [PATCH AUTOSEL 5.5 004/542] ath10k: Fix qmi init error handling Sasha Levin
2020-02-14 15:39 ` [PATCH AUTOSEL 5.5 005/542] wil6210: fix break that is never reached because of zero'ing of a retry counter Sasha Levin
2020-02-14 15:40 ` [PATCH AUTOSEL 5.5 026/542] brcmfmac: Fix memory leak in brcmf_p2p_create_p2pdev() Sasha Levin
2020-02-14 15:40 ` [PATCH AUTOSEL 5.5 027/542] brcmfmac: Fix use after free in brcmf_sdio_readframes() Sasha Levin
2020-02-14 15:40 ` [PATCH AUTOSEL 5.5 034/542] gianfar: Fix TX timestamping with a stacked DSA driver Sasha Levin
2020-02-14 15:40 ` [PATCH AUTOSEL 5.5 057/542] arm64: dts: marvell: clearfog-gt-8k: fix switch cpu port node Sasha Levin
2020-02-14 15:40 ` [PATCH AUTOSEL 5.5 066/542] net: ethernet: ixp4xx: Standard module init Sasha Levin
2020-02-14 15:41 ` [PATCH AUTOSEL 5.5 091/542] wan/hdlc_x25: fix skb handling Sasha Levin
2020-02-14 15:41 ` [PATCH AUTOSEL 5.5 107/542] ath10k: Correct the DMA direction for management tx buffers Sasha Levin
2020-02-14 15:41 ` [PATCH AUTOSEL 5.5 108/542] IB/mlx5: Return the administrative GUID if exists Sasha Levin
2020-02-14 15:41 ` [PATCH AUTOSEL 5.5 109/542] rtw88: fix rate mask for 1SS chip Sasha Levin
2020-02-14 15:41 ` [PATCH AUTOSEL 5.5 110/542] brcmfmac: sdio: Fix OOB interrupt initialization on brcm43362 Sasha Levin
2020-02-14 15:41 ` [PATCH AUTOSEL 5.5 111/542] libertas: don't exit from lbs_ibss_join_existing() with RCU read lock held Sasha Levin
2020-02-14 15:41 ` [PATCH AUTOSEL 5.5 112/542] libertas: make lbs_ibss_join_existing() return error code on rates overflow Sasha Levin
2020-02-14 15:41 ` [PATCH AUTOSEL 5.5 125/542] netfilter: flowtable: Fix missing flush hardware on table free Sasha Levin
2020-02-14 15:41 ` [PATCH AUTOSEL 5.5 126/542] netfilter: flowtable: Fix hardware flush order on nf_flow_table_cleanup Sasha Levin
2020-02-14 15:42 ` [PATCH AUTOSEL 5.5 132/542] mt76: mt7615: fix max_nss in mt7615_eeprom_parse_hw_cap Sasha Levin
2020-02-14 15:42 ` [PATCH AUTOSEL 5.5 133/542] bpftool: Don't crash on missing xlated program instructions Sasha Levin
2020-02-14 15:42 ` [PATCH AUTOSEL 5.5 134/542] bpf, sockhash: Synchronize_rcu before free'ing map Sasha Levin
2020-02-14 15:42 ` [PATCH AUTOSEL 5.5 135/542] bpf, sockmap: Check update requirements after locking Sasha Levin
2020-02-14 15:42 ` [PATCH AUTOSEL 5.5 136/542] bpf: Improve bucket_log calculation logic Sasha Levin
2020-02-14 15:42 ` [PATCH AUTOSEL 5.5 137/542] bpf, sockmap: Don't sleep while holding RCU lock on tear-down Sasha Levin
2020-02-14 15:42 ` [PATCH AUTOSEL 5.5 167/542] ath10k: correct the tlv len of ath10k_wmi_tlv_op_gen_config_pno_start Sasha Levin
2020-02-14 15:42 ` [PATCH AUTOSEL 5.5 177/542] net/wan/fsl_ucc_hdlc: reject muram offsets above 64K Sasha Levin
2020-02-14 15:42 ` [PATCH AUTOSEL 5.5 180/542] NFC: port100: Convert cpu_to_le16(le16_to_cpu(E1) + E2) to use le16_add_cpu() Sasha Levin
2020-02-14 15:43 ` [PATCH AUTOSEL 5.5 191/542] enetc: remove variable 'tc_max_sized_frame' set but not used Sasha Levin
2020-02-14 15:43 ` [PATCH AUTOSEL 5.5 207/542] Revert "nfp: abm: fix memory leak in nfp_abm_u32_knode_replace" Sasha Levin
2020-02-14 15:43 ` [PATCH AUTOSEL 5.5 209/542] selftests/net: make so_txtime more robust to timer variance Sasha Levin
2020-02-14 15:43 ` [PATCH AUTOSEL 5.5 212/542] samples/bpf: Set -fno-stack-protector when building BPF programs Sasha Levin
2020-02-14 15:43 ` [PATCH AUTOSEL 5.5 213/542] r8169: check that Realtek PHY driver module is loaded Sasha Levin
2020-02-14 15:43 ` [PATCH AUTOSEL 5.5 214/542] fore200e: Fix incorrect checks of NULL pointer dereference Sasha Levin
2020-02-14 15:43 ` [PATCH AUTOSEL 5.5 215/542] isdn: don't mark kcapi_proc_exit as __exit Sasha Levin
2020-02-14 15:43 ` [PATCH AUTOSEL 5.5 220/542] netfilter: nft_tunnel: add the missing ERSPAN_VERSION nla_policy Sasha Levin
2020-02-14 15:43 ` [PATCH AUTOSEL 5.5 226/542] b43legacy: Fix -Wcast-function-type Sasha Levin
2020-02-14 15:43 ` [PATCH AUTOSEL 5.5 227/542] ipw2x00: " Sasha Levin
2020-02-14 15:43 ` [PATCH AUTOSEL 5.5 228/542] iwlegacy: " Sasha Levin
2020-02-14 15:43 ` [PATCH AUTOSEL 5.5 229/542] rtlwifi: rtl_pci: " Sasha Levin
2020-02-14 15:43 ` [PATCH AUTOSEL 5.5 231/542] orinoco: avoid assertion in case of NULL pointer Sasha Levin
2020-02-14 15:44 ` [PATCH AUTOSEL 5.5 263/542] bpf: Print error message for bpftool cgroup show Sasha Levin
2020-02-14 15:44 ` [PATCH AUTOSEL 5.5 264/542] net: phy: realtek: add logging for the RGMII TX delay configuration Sasha Levin
2020-02-14 15:44 ` [PATCH AUTOSEL 5.5 266/542] net/wan/fsl_ucc_hdlc: remove set but not used variables 'ut_info' and 'ret' Sasha Levin
2020-02-14 15:44 ` [PATCH AUTOSEL 5.5 278/542] ice: add extra check for null Rx descriptor Sasha Levin
2020-02-14 15:44 ` [PATCH AUTOSEL 5.5 285/542] net: phy: fixed_phy: fix use-after-free when checking link GPIO Sasha Levin
2020-02-14 15:44 ` [PATCH AUTOSEL 5.5 286/542] tools lib api fs: Fix gcc9 stringop-truncation compilation error Sasha Levin
2020-02-14 15:44 ` [PATCH AUTOSEL 5.5 294/542] mlx5: work around high stack usage with gcc Sasha Levin
2020-02-14 15:45 ` [PATCH AUTOSEL 5.5 325/542] bnxt: Detach page from page pool before sending up the stack Sasha Levin
2020-02-14 15:45 ` [PATCH AUTOSEL 5.5 327/542] wan: ixp4xx_hss: fix compile-testing on 64-bit Sasha Levin
2020-02-14 15:45 ` [PATCH AUTOSEL 5.5 352/542] bpf: Return -EBADRQC for invalid map type in __bpf_tx_xdp_map Sasha Levin
2020-02-14 15:46 ` [PATCH AUTOSEL 5.5 386/542] netfilter: flowtable: restrict flow dissector match on meta ingress device Sasha Levin
2020-02-14 15:46 ` [PATCH AUTOSEL 5.5 401/542] enetc: Don't print from enetc_sched_speed_set when link goes down Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 438/542] bpf, btf: Always output invariant hit in pahole DWARF to BTF transform Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 440/542] sunrpc: Fix potential leaks in sunrpc_cache_unhash() Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 443/542] net/mlx5e: Fix printk format warning Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 461/542] selftests: bpf: Reset global state between reuseport test runs Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 471/542] ath10k: pci: Only dump ATH10K_MEM_REGION_TYPE_IOREG when safe Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 472/542] hostap: Adjust indentation in prism2_hostapd_add_sta Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 473/542] rtw88: fix potential NULL skb access in TX ISR Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 474/542] rtlwifi: rtl8821ae: remove unused variables Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 475/542] rtlwifi: rtl8192ee: " Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 476/542] rtlwifi: rtl8723ae: " Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 477/542] iwlegacy: ensure loop counter addr does not wrap and cause an infinite loop Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 482/542] bpf: map_seq_next should always increase position index Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 484/542] mwifiex: Fix possible buffer overflows in mwifiex_ret_wmm_get_status() Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 485/542] mwifiex: Fix possible buffer overflows in mwifiex_cmd_append_vsie_tlv() Sasha Levin
2020-02-14 15:48 ` [PATCH AUTOSEL 5.5 502/542] powerpc: Do not consider weak unresolved symbol relocations as bad Sasha Levin
2020-02-14 15:48 ` [PATCH AUTOSEL 5.5 516/542] iwlwifi: mvm: Fix thermal zone registration Sasha Levin
2020-02-14 15:48 ` [PATCH AUTOSEL 5.5 517/542] iwlwifi: mvm: avoid use after free for pmsr request Sasha Levin
2020-02-14 15:48 ` [PATCH AUTOSEL 5.5 518/542] iwlwifi: mvm: Check the sta is not NULL in iwl_mvm_cfg_he_sta() Sasha Levin
2020-02-14 15:48 ` [PATCH AUTOSEL 5.5 519/542] iwlwifi: mvm: fix TDLS discovery with the new firmware API Sasha Levin
2020-02-14 15:48 ` [PATCH AUTOSEL 5.5 521/542] netdevsim: fix using uninitialized resources Sasha Levin
2020-02-14 15:48 ` [PATCH AUTOSEL 5.5 522/542] netdevsim: disable devlink reload when resources are being used Sasha Levin
2020-02-14 15:48 ` [PATCH AUTOSEL 5.5 523/542] netdevsim: fix panic in nsim_dev_take_snapshot_write() Sasha Levin
2020-02-14 15:48 ` Sasha Levin [this message]
2020-02-14 16:23   ` [PATCH AUTOSEL 5.5 524/542] netdevsim: use __GFP_NOWARN to avoid memalloc warning Jakub Kicinski
2020-02-14 15:48 ` [PATCH AUTOSEL 5.5 535/542] i40e: Relax i40e_xsk_wakeup's return value when PF is busy Sasha Levin
2020-02-14 15:48 ` [PATCH AUTOSEL 5.5 540/542] mlxsw: core: Add validation of hardware device types for MGPIR register Sasha Levin
2020-02-14 15:48 ` [PATCH AUTOSEL 5.5 541/542] mlxsw: spectrum_dpipe: Add missing error path Sasha Levin

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