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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
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include/libuutil.h
+4 -4
View File
@@ -85,13 +85,13 @@ extern void uu_warn(const char *, ...)
__attribute__((format(printf, 1, 2)));
extern void uu_vwarn(const char *, va_list)
__attribute__((format(printf, 1, 0)));
extern _Noreturn void uu_die(const char *, ...)
extern __attribute__((noreturn)) void uu_die(const char *, ...)
__attribute__((format(printf, 1, 2)));
extern _Noreturn void uu_vdie(const char *, va_list)
extern __attribute__((noreturn)) void uu_vdie(const char *, va_list)
__attribute__((format(printf, 1, 0)));
extern _Noreturn void uu_xdie(int, const char *, ...)
extern __attribute__((noreturn)) void uu_xdie(int, const char *, ...)
__attribute__((format(printf, 2, 3)));
extern _Noreturn void uu_vxdie(int, const char *, va_list)
extern __attribute__((noreturn)) void uu_vxdie(int, const char *, va_list)
__attribute__((format(printf, 2, 0)));
/*