4d1ceea851
under memory pressure 'ethtool -S' command may warn:
[ 2374.385195] ethtool: page allocation failure: order:4, mode:0x242c0c0
[ 2374.405573] CPU: 12 PID: 40211 Comm: ethtool Not tainted
[ 2374.423071] Call Trace:
[ 2374.423076] [<ffffffff8148cb29>] dump_stack+0x4d/0x64
[ 2374.423080] [<ffffffff811667cb>] warn_alloc_failed+0xeb/0x150
[ 2374.423082] [<ffffffff81169cd3>] ? __alloc_pages_direct_compact+0x43/0xf0
[ 2374.423084] [<ffffffff8116a25c>] __alloc_pages_nodemask+0x4dc/0xbf0
[ 2374.423091] [<ffffffffa0023dc2>] ? cmd_exec+0x722/0xcd0 [mlx5_core]
[ 2374.423095] [<ffffffff811b3dcc>] alloc_pages_current+0x8c/0x110
[ 2374.423097] [<ffffffff81168859>] alloc_kmem_pages+0x19/0x90
[ 2374.423099] [<ffffffff81186e5e>] kmalloc_order_trace+0x2e/0xe0
[ 2374.423101] [<ffffffff811c0084>] __kmalloc+0x204/0x220
[ 2374.423105] [<ffffffff816c269e>] dev_ethtool+0xe4e/0x1f80
[ 2374.423106] [<ffffffff816b967e>] ? dev_get_by_name_rcu+0x5e/0x80
[ 2374.423108] [<ffffffff816d6926>] dev_ioctl+0x156/0x560
[ 2374.423111] [<ffffffff811d4c68>] ? mem_cgroup_commit_charge+0x78/0x3c0
[ 2374.423117] [<ffffffff8169d542>] sock_do_ioctl+0x42/0x50
[ 2374.423119] [<ffffffff8169d9c3>] sock_ioctl+0x1b3/0x250
[ 2374.423121] [<ffffffff811f0f42>] do_vfs_ioctl+0x92/0x580
[ 2374.423123] [<ffffffff8100222b>] ? do_audit_syscall_entry+0x4b/0x70
[ 2374.423124] [<ffffffff8100287c>] ? syscall_trace_enter_phase1+0xfc/0x120
[ 2374.423126] [<ffffffff811f14a9>] SyS_ioctl+0x79/0x90
[ 2374.423127] [<ffffffff81002bb0>] do_syscall_64+0x50/0xa0
[ 2374.423129] [<ffffffff817e19bc>] entry_SYSCALL64_slow_path+0x25/0x25
~1160 mlx5 counters ~= order 4 allocation which is unlikely to succeed
under memory pressure. Convert them to vzalloc() as ethtool_get_regs() does.
Also take care of drivers without counters similar to
commit 67ae7cf1eeda ("ethtool: Allow zero-length register dumps again")
and reduce warn_on to warn_on_once.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.