selftests/bpf: Add test for Spectre v1 mitigation
This is based on the gadget from the description of commit 9183671a ("bpf: Fix leakage under speculation on mispredicted branches"). Signed-off-by:Luis Gerhorst <luis.gerhorst@fau.de> Acked-by:
Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20250603212814.338867-1-luis.gerhorst@fau.de Signed-off-by:
Alexei Starovoitov <ast@kernel.org>
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