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nptl: Remove the rseq area from 'struct pthread'

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The rseq extensible ABI implementation moved the rseq area to the 'extra
TLS' block, remove the unused 'rseq_area' member of 'struct pthread'.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reviewed-by: Florian Weimer <fweimer@redhat.com>
This commit is contained in:
Michael Jeanson 2024-08-01 14:29:10 -04:00
parent 93d0bfbe8f
commit 540c817266
1 changed files with 3 additions and 19 deletions
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22
nptl/descr.h
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@ -407,27 +407,11 @@ struct pthread
/* getrandom vDSO per-thread opaque state. */
void *getrandom_buf;
/* rseq area registered with the kernel. Use a custom definition
here to isolate from kernel struct rseq changes. The
implementation of sched_getcpu needs acccess to the cpu_id field;
the other fields are unused and not included here. */
union
{
struct
{
uint32_t cpu_id_start;
uint32_t cpu_id;
uint64_t rseq_cs;
uint32_t flags;
};
char pad[32]; /* Original rseq area size. */
} rseq_area __attribute__ ((aligned (32)));
/* Amount of end padding, if any, in this structure.
This definition relies on rseq_area being last. */
This definition relies on getrandom_buf being last. */
#define PTHREAD_STRUCT_END_PADDING \
(sizeof (struct pthread) - offsetof (struct pthread, rseq_area) \
+ sizeof ((struct pthread) {}.rseq_area))
(sizeof (struct pthread) - offsetof (struct pthread, getrandom_buf) \
+ sizeof ((struct pthread) {}.getrandom_buf))
} __attribute ((aligned (TCB_ALIGNMENT)));
static inline bool