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[RFC,v11,16/17] nptl: Remove the rseq area from 'struct pthread'

Message ID 20240801-rseq-abi-v11-split-v11-16-b7bbc0138bfd@efficios.com
State New
Headers show
Series Add rseq extensible ABI support | expand

Commit Message

Michael Jeanson Aug. 2, 2024, 7:02 p.m. UTC 
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>
---
 nptl/descr.h | 20 +++-----------------
 1 file changed, 3 insertions(+), 17 deletions(-)
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Patch

diff --git a/nptl/descr.h b/nptl/descr.h
index 8cef95810c..cdc3c82d9a 100644
--- a/nptl/descr.h
+++ b/nptl/descr.h
@@ -404,25 +404,11 @@  struct pthread
   /* Used on strsignal.  */
   struct tls_internal_t tls_state;
 
-  /* 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;
-    };
-    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 tls_state 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, tls_state) \
+   + sizeof ((struct pthread) {}.tls_state))
 } __attribute ((aligned (TCB_ALIGNMENT)));
 
 static inline bool