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nptl: Unconditionally use a 32-byte rseq area
If the kernel headers provide a larger struct rseq, we used that size as the argument to the rseq system call. As a result, rseq registration would fail on older kernels which only accept size 32.
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18
nptl/descr.h
18
nptl/descr.h
@ -34,7 +34,6 @@
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#include <bits/types/res_state.h>
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#include <kernel-features.h>
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#include <tls-internal-struct.h>
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#include <sys/rseq.h>
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#include <internal-sigset.h>
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#ifndef TCB_ALIGNMENT
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@ -405,14 +404,25 @@ struct pthread
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/* Used on strsignal. */
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struct tls_internal_t tls_state;
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/* rseq area registered with the kernel. */
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struct rseq rseq_area;
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/* rseq area registered with the kernel. Use a custom definition
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here to isolate from kernel struct rseq changes. The
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implementation of sched_getcpu needs acccess to the cpu_id field;
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the other fields are unused and not included here. */
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union
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{
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struct
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{
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uint32_t cpu_id_start;
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uint32_t cpu_id;
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};
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char pad[32]; /* Original rseq area size. */
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} rseq_area __attribute__ ((aligned (32)));
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/* Amount of end padding, if any, in this structure.
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This definition relies on rseq_area being last. */
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#define PTHREAD_STRUCT_END_PADDING \
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(sizeof (struct pthread) - offsetof (struct pthread, rseq_area) \
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+ sizeof (struct rseq))
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+ sizeof ((struct pthread) {}.rseq_area))
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} __attribute ((aligned (TCB_ALIGNMENT)));
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static inline bool
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