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Switch from _Noreturn to __attribute__((noreturn))

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Parts of the Linux kernel build system struggle with _Noreturn.  This
results in the following warnings when building on RHEL 8.5, and likely
other environments.  Switch to using the __attribute__((noreturn)).

  warning: objtool: dbuf_free_range()+0x2b8:
    return with modified stack frame
  warning: objtool: dbuf_free_range()+0x0:
    stack state mismatch: cfa1=7+40 cfa2=7+8
  ...
  WARNING: EXPORT symbol "arc_buf_size" [zfs.ko] version generation
    failed, symbol will not be versioned.
  WARNING: EXPORT symbol "spa_open" [zfs.ko] version generation
    failed, symbol will not be versioned.
  ...

Additionally, __thread_exit() has been renamed spl_thread_exit() and
made a static inline function.  This was needed because the kernel
will generate a warning for symbols which are __attribute__((noreturn))
and then exported with EXPORT_SYMBOL.

While we could continue to use _Noreturn in user space I've also
switched it to __attribute__((noreturn)) purely for consistency
throughout the code base.

Reviewed-by: Ryan Moeller <freqlabs@FreeBSD.org>
Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #13238
This commit is contained in:
Brian Behlendorf
2022-03-23 08:51:00 -07:00
committed by GitHub
parent b73505c7e0
commit 460748d4ae
29 changed files with 71 additions and 74 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/vdev_trim.c
+3 -3
View File
@@ -834,7 +834,7 @@ vdev_trim_range_add(void *arg, uint64_t start, uint64_t size)
* by its ms_allocatable. While a metaslab is undergoing trimming it is
* not eligible for new allocations.
*/
static _Noreturn void
static __attribute__((noreturn)) void
vdev_trim_thread(void *arg)
{
vdev_t *vd = arg;
@@ -1175,7 +1175,7 @@ vdev_trim_range_verify(void *arg, uint64_t start, uint64_t size)
* N.B. This behavior is different from a manual TRIM where a thread
* is created for each leaf vdev, instead of each top-level vdev.
*/
static _Noreturn void
static __attribute__((noreturn)) void
vdev_autotrim_thread(void *arg)
{
vdev_t *vd = arg;
@@ -1514,7 +1514,7 @@ vdev_autotrim_restart(spa_t *spa)
vdev_autotrim(spa);
}
static _Noreturn void
static __attribute__((noreturn)) void
vdev_trim_l2arc_thread(void *arg)
{
vdev_t *vd = arg;