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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
include/os/linux/spl/sys/thread.h
+8 -2
View File
@@ -53,7 +53,7 @@ typedef void (*thread_func_t)(void *);
__thread_create(stk, stksize, (thread_func_t)func, #func, \
arg, len, pp, state, pri)
#define thread_exit() __thread_exit()
#define thread_exit() spl_thread_exit()
#define thread_join(t) VERIFY(0)
#define curthread current
#define getcomm() current->comm
@@ -62,10 +62,16 @@ typedef void (*thread_func_t)(void *);
extern kthread_t *__thread_create(caddr_t stk, size_t stksize,
thread_func_t func, const char *name, void *args, size_t len, proc_t *pp,
int state, pri_t pri);
extern __attribute__((noreturn)) void __thread_exit(void);
extern struct task_struct *spl_kthread_create(int (*func)(void *),
void *data, const char namefmt[], ...);
static inline __attribute__((noreturn)) void
spl_thread_exit(void)
{
tsd_exit();
SPL_KTHREAD_COMPLETE_AND_EXIT(NULL, 0);
}
extern proc_t p0;
#ifdef HAVE_SIGINFO