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commit 4b527650e0d559a5f693275c598667e06cd6455c
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Jun 2 16:29:55 2022 +0200
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Linux: Adjust struct rseq definition to current kernel version
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This definition is only used as a fallback with old kernel headers.
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The change follows kernel commit bfdf4e6208051ed7165b2e92035b4bf11
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("rseq: Remove broken uapi field layout on 32-bit little endian").
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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diff --git a/sysdeps/unix/sysv/linux/sys/rseq.h b/sysdeps/unix/sysv/linux/sys/rseq.h
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index 791ed83176b61fe4..56550329db962cc8 100644
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--- a/sysdeps/unix/sysv/linux/sys/rseq.h
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+++ b/sysdeps/unix/sysv/linux/sys/rseq.h
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@@ -24,7 +24,6 @@
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#include <stddef.h>
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#include <stdint.h>
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#include <sys/cdefs.h>
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-#include <bits/endian.h>
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#ifdef __has_include
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# if __has_include ("linux/rseq.h")
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@@ -129,28 +128,13 @@ struct rseq
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targeted by the rseq_cs. Also needs to be set to NULL by user-space
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before reclaiming memory that contains the targeted struct rseq_cs.
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- Read and set by the kernel. Set by user-space with single-copy
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- atomicity semantics. This field should only be updated by the
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- thread which registered this data structure. Aligned on 64-bit. */
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- union
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- {
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- uint64_t ptr64;
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-# ifdef __LP64__
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- uint64_t ptr;
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-# else /* __LP64__ */
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- struct
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- {
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-#if __BYTE_ORDER == __BIG_ENDIAN
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- uint32_t padding; /* Initialized to zero. */
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- uint32_t ptr32;
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-# else /* LITTLE */
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- uint32_t ptr32;
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- uint32_t padding; /* Initialized to zero. */
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-# endif /* ENDIAN */
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- } ptr;
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-# endif /* __LP64__ */
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- } rseq_cs;
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+ Read and set by the kernel. Set by user-space with single-copy
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+ atomicity semantics. This field should only be updated by the
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+ thread which registered this data structure. Aligned on 64-bit.
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+ 32-bit architectures should update the low order bits of the
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+ rseq_cs field, leaving the high order bits initialized to 0. */
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+ uint64_t rseq_cs;
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/* Restartable sequences flags field.
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This field should only be updated by the thread which
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