bpf: Allow specifying volatile type modifier for kptrs

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This is useful in particular to mark the pointer as volatile, so that
compiler treats each load and store to the field as a volatile access.
The alternative is having to define and use READ_ONCE and WRITE_ONCE in
the BPF program.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Acked-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20221103191013.1236066-3-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Kumar Kartikeya Dwivedi 2022-11-04 00:39:51 +05:30 • committed by Alexei Starovoitov

parent 9805af8d8a

commit 23da464dd6

2 changed files with 8 additions and 0 deletions

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5

include/linux/btf.h

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3

kernel/bpf/btf.c

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