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libbpf: Fix endianness detection in BPF_CORE_READ_BITFIELD_PROBED()
[ Upstream commit 45f2beb ] __BYTE_ORDER is supposed to be defined by a libc, and __BYTE_ORDER__ - by a compiler. bpf_core_read.h checks __BYTE_ORDER == __LITTLE_ENDIAN, which is true if neither are defined, leading to incorrect behavior on big-endian hosts if libc headers are not included, which is often the case. Fixes: ee26dad ("libbpf: Add support for relocatable bitfields") Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20211026010831.748682-2-iii@linux.ibm.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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