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Filename Latest commit message Latest commit date
Alexei Starovoitov b89c2998d9 Merge branch 'non-jit-btf-func_info' 
Yonghong Song says:

====================
Commit 838e96904f ("bpf: Introduce bpf_func_info")
added bpf func info support. The userspace is able
to get better ksym's for bpf programs with jit, and
is able to print out func prototypes.

For a program containing func-to-func calls, the existing
implementation returns user specified number of function
calls and BTF types if jit is enabled. If the jit is not
enabled, it only returns the type for the main function.

This is undesirable. Interpreter may still be used
and we should keep feature identical regardless of
whether jit is enabled or not.
This patch fixed this discrepancy.

The following example shows bpftool output for
the bpf program in selftests test_btf_haskv.o when jit
is disabled:
  $ bpftool prog dump xlated id 1490
  int _dummy_tracepoint(struct dummy_tracepoint_args * arg):
     0: (85) call pc+2#__bpf_prog_run_args32
     1: (b7) r0 = 0
     2: (95) exit
  int test_long_fname_1(struct dummy_tracepoint_args * arg):
     3: (85) call pc+1#__bpf_prog_run_args32
     4: (95) exit
  int test_long_fname_2(struct dummy_tracepoint_args * arg):
     5: (b7) r2 = 0
     6: (63) *(u32 *)(r10 -4) = r2
     7: (79) r1 = *(u64 *)(r1 +8)
     8: (15) if r1 == 0x0 goto pc+9
     9: (bf) r2 = r10
    10: (07) r2 += -4
    11: (18) r1 = map[id:1173]
    13: (85) call bpf_map_lookup_elem#77088
    14: (15) if r0 == 0x0 goto pc+3
    15: (61) r1 = *(u32 *)(r0 +4)
    16: (07) r1 += 1
    17: (63) *(u32 *)(r0 +4) = r1
    18: (95) exit
  $ bpftool prog dump jited id 1490
    no instructions returned
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-11-26 17:57:11 -08:00
arch Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-11-24 17:01:43 -08:00
block SCSI: fix queue cleanup race before queue initialization is done 2018-11-14 08:19:10 -07:00
certs
crypto crypto: user - Zeroize whole structure given to user space 2018-11-09 17:35:43 +08:00
Documentation Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-11-24 17:01:43 -08:00
drivers Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2018-11-26 13:08:17 -08:00
firmware
fs Changes since last update: 2018-11-24 09:11:52 -08:00
include bpf: btf: support proper non-jit func info 2018-11-26 17:57:10 -08:00
init memblock: stop using implicit alignment to SMP_CACHE_BYTES 2018-10-31 08:54:16 -07:00
ipc ipc: IPCMNI limit check for semmni 2018-10-31 08:54:14 -07:00
kernel bpf: btf: support proper non-jit func info 2018-11-26 17:57:10 -08:00
lib Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-11-24 17:01:43 -08:00
LICENSES
mm mm/memblock.c: fix a typo in __next_mem_pfn_range() comments 2018-11-18 10:15:10 -08:00
net bpf: Avoid unnecessary instruction in convert_bpf_ld_abs() 2018-11-26 23:10:27 +01:00
samples samples: bpf: fix: error handling regarding kprobe_events 2018-11-23 22:39:09 +01:00
scripts scripts/spdxcheck.py: make python3 compliant 2018-11-18 10:15:10 -08:00
security selinux/stable-4.20 PR 20181115 2018-11-15 11:26:09 -06:00
sound ALSA: hda/ca0132 - fix AE-5 pincfg 2018-11-19 12:18:43 +01:00
tools tools/bpf: change selftest test_btf for both jit and non-jit 2018-11-26 17:57:10 -08:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap mailmap: Update email for Punit Agrawal 2018-11-05 10:02:11 +00:00
COPYING
CREDITS MAINTAINERS: update OMAP MMC entry 2018-11-18 10:15:09 -08:00
Kbuild
Kconfig
MAINTAINERS Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-11-24 17:01:43 -08:00
Makefile Linux 4.20-rc3 2018-11-18 13:33:44 -08:00
README

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.