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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2020-12-30 19:19:37 +0000 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2021-04-12 14:33:02 +0100 |
| commit | 10fb15a36b3f6bc3e5ca62cda081c86512f47d32 (patch) | |
| tree | c5592e531ca3a73bedecd9911762dcedca94d52a /sysdeps/x86_64/dl-tls.c | |
| parent | ae990875879c5c4c14bb837c0971e88e2369193c (diff) | |
| download | glibc-10fb15a36b3f6bc3e5ca62cda081c86512f47d32.tar.gz glibc-10fb15a36b3f6bc3e5ca62cda081c86512f47d32.tar.xz glibc-10fb15a36b3f6bc3e5ca62cda081c86512f47d32.zip | |
elf: Use relaxed atomics for racy accesses [BZ #19329]
This is a follow up patch to the fix for bug 19329. This adds relaxed MO atomics to accesses that are racy, but relaxed MO is enough. -- v2: - handle x86_64 dl-tls.c too
Diffstat (limited to 'sysdeps/x86_64/dl-tls.c')
| -rw-r--r-- | sysdeps/x86_64/dl-tls.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sysdeps/x86_64/dl-tls.c b/sysdeps/x86_64/dl-tls.c index 6595f6615b..24ef560b71 100644 --- a/sysdeps/x86_64/dl-tls.c +++ b/sysdeps/x86_64/dl-tls.c @@ -40,7 +40,8 @@ __tls_get_addr_slow (GET_ADDR_ARGS) { dtv_t *dtv = THREAD_DTV (); - if (__glibc_unlikely (dtv[0].counter != GL(dl_tls_generation))) + size_t gen = atomic_load_relaxed (&GL(dl_tls_generation)); + if (__glibc_unlikely (dtv[0].counter != gen)) return update_get_addr (GET_ADDR_PARAM); return tls_get_addr_tail (GET_ADDR_PARAM, dtv, NULL); |