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Daniel Borkmann 2824ecb701 bpf: allow for key-less BTF in array map 
Given we'll be reusing BPF array maps for global data/bss/rodata
sections, we need a way to associate BTF DataSec type as its map
value type. In usual cases we have this ugly BPF_ANNOTATE_KV_PAIR()
macro hack e.g. via 38d5d3b3d5 ("bpf: Introduce BPF_ANNOTATE_KV_PAIR")
to get initial map to type association going. While more use cases
for it are discouraged, this also won't work for global data since
the use of array map is a BPF loader detail and therefore unknown
at compilation time. For array maps with just a single entry we make
an exception in terms of BTF in that key type is declared optional
if value type is of DataSec type. The latter LLVM is guaranteed to
emit and it also aligns with how we regard global data maps as just
a plain buffer area reusing existing map facilities for allowing
things like introspection with existing tools.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-04-09 17:05:46 -07:00
..
acpi ACPI updates for 5.1-rc1 2019-03-06 13:33:11 -08:00
asm-generic kbuild: force all architectures except um to include mandatory-y 2019-03-17 12:56:32 +09:00
clocksource
crypto
drm drm i915, amdgpu, qxl and etnaviv fixes 2019-03-15 13:58:35 -07:00
dt-bindings We have a fairly balanced mix of clk driver updates and clk framework 2019-03-14 08:46:17 -07:00
keys Merge branch 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2019-03-10 17:32:04 -07:00
kvm ARM: some cleanups, direct physical timer assignment, cache sanitization 2019-03-15 15:00:28 -07:00
linux bpf: allow for key-less BTF in array map 2019-04-09 17:05:46 -07:00
math-emu
media media: include: fix several typos 2019-03-01 09:45:52 -05:00
memory
misc auxdisplay: charlcd: Introduce charlcd_free() helper 2019-03-17 08:48:16 +01:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-03-27 17:37:58 -07:00
pcmcia
ras
rdma
scsi
soc IOMMU Updates for Linux v5.1 2019-03-10 12:29:52 -07:00
sound sound fixes for 5.1-rc1 2019-03-15 14:05:00 -07:00
target
trace NFS client bugfixes for Linux 5.1 2019-03-16 12:28:18 -07:00
uapi bpf: add specification for BTF Var and DataSec kinds 2019-04-09 17:05:46 -07:00
video media updates for v5.1-rc1 2019-03-09 14:45:54 -08:00
xen