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Aijun Sun 19f68ed6dc bpf, arm64: Allocate program buffer using kvcalloc instead of kcalloc 
It is not necessary to allocate contiguous physical memory for BPF
program buffer using kcalloc. When the BPF program is large more than
memory page size, kcalloc allocates multiple memory pages from buddy
system. If the device can not provide sufficient memory, for example
in low-end android devices [0], memory allocation for BPF program is
likely to fail.

Test cases in lib/test_bpf.c all pass on ARM64 QEMU.

[0]
  AndroidTestSuit: page allocation failure: order:4,
  mode:0x40dc0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), nodemask=(null),cpuset=foreground,mems_allowed=0
  Call trace:
   dump_stack+0xa4/0x114
   warn_alloc+0xf8/0x14c
   __alloc_pages_slowpath+0xac8/0xb14
   __alloc_pages_nodemask+0x194/0x3d0
   kmalloc_order_trace+0x44/0x1e8
   __kmalloc+0x29c/0x66c
   bpf_int_jit_compile+0x17c/0x568
   bpf_prog_select_runtime+0x4c/0x1b0
   bpf_prepare_filter+0x5fc/0x6bc
   bpf_prog_create_from_user+0x118/0x1c0
   seccomp_set_mode_filter+0x1c4/0x7cc
   __do_sys_prctl+0x380/0x1424
   __arm64_sys_prctl+0x20/0x2c
   el0_svc_common+0xc8/0x22c
   el0_svc_handler+0x1c/0x28
   el0_svc+0x8/0x100

Signed-off-by: Aijun Sun <aijun.sun@unisoc.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220804025442.22524-1-aijun.sun@unisoc.com
2022-08-08 16:42:43 +02:00
arch bpf, arm64: Allocate program buffer using kvcalloc instead of kcalloc 2022-08-08 16:42:43 +02:00
block iov_iter work, part 1 - isolated cleanups and optimizations. 2022-08-03 13:50:22 -07:00
certs certs: make system keyring depend on x509 parser 2022-07-24 12:53:55 -07:00
crypto This update includes the following changes: 2022-08-02 17:45:14 -07:00
Documentation bpf: Update bpf_design_QA.rst to clarify that BTF_ID does not ABIify a function 2022-08-04 13:17:24 -07:00
drivers nfp: ethtool: fix the display error of ethtool -m DEVNAME 2022-08-03 19:20:54 -07:00
fs zonefs changes for 5.20-rc1 2022-08-03 15:21:53 -07:00
include mptcp, btf: Add struct mptcp_sock definition when CONFIG_MPTCP is disabled 2022-08-08 15:30:45 +02:00
init Several core optimizations: 2022-08-03 09:45:08 -07:00
io_uring iov_iter work, part 1 - isolated cleanups and optimizations. 2022-08-03 13:50:22 -07:00
ipc ipc: Free mq_sysctls if ipc namespace creation failed 2022-06-22 17:47:41 -05:00
kernel bpf: Use proper target btf when exporting attach_btf_obj_id 2022-08-08 15:53:17 +02:00
lib Networking changes for 6.0. 2022-08-03 16:29:08 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm for-5.20-tag 2022-08-03 14:54:52 -07:00
net net/sched: remove hacks added to dev_trans_start() for bonding to work 2022-08-03 19:20:13 -07:00
samples Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-07-22 16:55:44 -07:00
scripts Networking changes for 6.0. 2022-08-03 16:29:08 -07:00
security linux-kselftest-kunit-5.20-rc1 2022-08-02 19:34:45 -07:00
sound ASoC: Drop Rockchip BCLK management for v5.19 2022-07-15 12:31:07 +02:00
tools selftests/bpf: Excercise bpf_obj_get_info_by_fd for bpf2bpf 2022-08-08 15:53:39 +02:00
usr Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
virt KVM: x86: disable preemption around the call to kvm_arch_vcpu_{un|}blocking 2022-06-09 10:52:20 -04:00
.clang-format clang-format: Fix space after for_each macros 2022-05-20 19:27:16 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore kbuild: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
.mailmap ARM: SoC fixes for 5.19, part 4 2022-07-27 09:43:07 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: mark ARM/PALM TREO SUPPORT orphan 2022-07-07 15:17:00 +02:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Networking changes for 6.0. 2022-08-03 16:29:08 -07:00
Makefile linux-kselftest-next-5.20-rc1 2022-08-02 19:44:56 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

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.