You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
1.8 KiB
57 lines
1.8 KiB
1 year ago
|
commit 2c6b4b272e6b4d07303af25709051c3e96288f2d
|
||
|
|
Author: Florian Weimer <fweimer@redhat.com>
|
||
|
|
Date: Fri Jul 21 16:18:18 2023 +0200
|
||
|
|
|
||
|
|
nptl: Unconditionally use a 32-byte rseq area
|
||
|
|
|
||
|
|
If the kernel headers provide a larger struct rseq, we used that
|
||
|
|
size as the argument to the rseq system call. As a result,
|
||
|
|
rseq registration would fail on older kernels which only accept
|
||
|
|
size 32.
|
||
|
|
|
||
|
|
Conflicts:
|
||
|
|
nptl/descr.h
|
||
|
|
(upstream has an additional #include <internal-sigset.h>)
|
||
|
|
|
||
|
|
diff --git a/nptl/descr.h b/nptl/descr.h
|
||
|
|
index c487846c171f9434..eded9eca38e7275e 100644
|
||
|
|
--- a/nptl/descr.h
|
||
|
|
+++ b/nptl/descr.h
|
||
|
|
@@ -35,7 +35,6 @@
|
||
|
|
#include <bits/types/res_state.h>
|
||
|
|
#include <kernel-features.h>
|
||
|
|
#include <tls-internal-struct.h>
|
||
|
|
-#include <sys/rseq.h>
|
||
|
|
|
||
|
|
#ifndef TCB_ALIGNMENT
|
||
|
|
# define TCB_ALIGNMENT 32
|
||
|
|
@@ -409,14 +408,25 @@ struct pthread
|
||
|
|
/* Used on strsignal. */
|
||
|
|
struct tls_internal_t tls_state;
|
||
|
|
|
||
|
|
- /* rseq area registered with the kernel. */
|
||
|
|
- struct rseq rseq_area;
|
||
|
|
+ /* 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. */
|
||
|
|
#define PTHREAD_STRUCT_END_PADDING \
|
||
|
|
(sizeof (struct pthread) - offsetof (struct pthread, rseq_area) \
|
||
|
|
- + sizeof (struct rseq))
|
||
|
|
+ + sizeof ((struct pthread) {}.rseq_area))
|
||
|
|
} __attribute ((aligned (TCB_ALIGNMENT)));
|
||
|
|
|
||
|
|
static inline bool
|