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selftests/rseq: Use ELF auxiliary vector for extensible rseq

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Use the ELF auxiliary vector AT_RSEQ_FEATURE_SIZE to detect the RSEQ
features supported by the kernel.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20221122203932.231377-6-mathieu.desnoyers@efficios.com
This commit is contained in:
Mathieu Desnoyers
2022-11-22 15:39:07 -05:00
committed by Peter Zijlstra
parent cbae6bac29
commit 03f5c0272d
3 changed files with 78 additions and 12 deletions
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5
tools/testing/selftests/rseq/rseq-abi.h
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@@ -146,6 +146,11 @@ struct rseq_abi {
* this thread.
*/
__u32 flags;
/*
* Flexible array member at end of structure, after last feature field.
*/
char end[];
} __attribute__((aligned(4 * sizeof(__u64))));
#endif /* _RSEQ_ABI_H */