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authorFlorian Weimer <fweimer@redhat.com>2020-07-16 17:55:35 +0200
committerFlorian Weimer <fweimer@redhat.com>2020-07-16 17:55:35 +0200
commitefedd1ed3d211941fc66d14ba245be3552b2616a (patch)
tree67e2e7d222933fa2f442ff92019d4ba85eee23a2 /nptl
parentda7d62b50396c8b6d67c1ba800a196e83e2ec469 (diff)
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Linux: Remove rseq support
The kernel ABI is not finalized, and there are now various proposals to change the size of struct rseq, which would make the glibc ABI dependent on the version of the kernels used for building glibc. This is of course not acceptable. This reverts commit 48699da1c468543ade14777819bd1b4d652709de ("elf: Support at least 32-byte alignment in static dlopen"), commit 8f4632deb3545b2949cec5454afc3cb21a0024ea ("Linux: rseq registration tests"), commit 6e29cb3f61ff5432c78a1c84b0d9b123a350ab36 ("Linux: Use rseq in sched_getcpu if available"), and commit 0c76fc3c2b346dc5401dc055d97d4279632b0fb3 ("Linux: Perform rseq registration at C startup and thread creation"), resolving the conflicts introduced by the ARC port and the TLS static surplus changes. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'nptl')
-rw-r--r--nptl/pthread_create.c13
1 files changed, 0 insertions, 13 deletions
diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c
index e05013e317..2cba3da38c 100644
--- a/nptl/pthread_create.c
+++ b/nptl/pthread_create.c
@@ -33,7 +33,6 @@
#include <default-sched.h>
#include <futex-internal.h>
#include <tls-setup.h>
-#include <rseq-internal.h>
#include "libioP.h"
#include <sys/single_threaded.h>
@@ -386,9 +385,6 @@ START_THREAD_DEFN
/* Initialize pointers to locale data. */
__ctype_init ();
- /* Register rseq TLS to the kernel. */
- rseq_register_current_thread ();
-
#ifndef __ASSUME_SET_ROBUST_LIST
if (__set_robust_list_avail >= 0)
#endif
@@ -585,15 +581,6 @@ START_THREAD_DEFN
process is really dead since 'clone' got passed the CLONE_CHILD_CLEARTID
flag. The 'tid' field in the TCB will be set to zero.
- rseq TLS is still registered at this point. Rely on implicit
- unregistration performed by the kernel on thread teardown. This is not a
- problem because the rseq TLS lives on the stack, and the stack outlives
- the thread. If TCB allocation is ever changed, additional steps may be
- required, such as performing explicit rseq unregistration before
- reclaiming the rseq TLS area memory. It is NOT sufficient to block
- signals because the kernel may write to the rseq area even without
- signals.
-
The exit code is zero since in case all threads exit by calling
'pthread_exit' the exit status must be 0 (zero). */
__exit_thread ();