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smpboot: Mark idle_init() as __always_inlined to work around aggressive compiler un-inlining

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While this function is a static inline, and is only used once in
local scope, certain Kconfig variations may cause it to be compiled
as a standalone function:

  89231bf0 <idle_init>:
  89231bf0:       83 05 60 d9 45 89 01    addl   $0x1,0x8945d960
  89231bf7:       55                      push   %ebp

Resulting in this build failure:

  WARNING: modpost: vmlinux.o(.text.unlikely+0x7fd5): Section mismatch in reference from the function idle_init() to the function .init.text:fork_idle()
  The function idle_init() references
  the function __init fork_idle().
  This is often because idle_init lacks a __init
  annotation or the annotation of fork_idle is wrong.
  ERROR: modpost: Section mismatches detected.

Certain USBSAN options x86-32 builds with CONFIG_CC_OPTIMIZE_FOR_SIZE=y
seem to be causing this.

So mark idle_init() as __always_inline to work around this compiler
bug/feature.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2021-07-11 08:26:45 +02:00
parent 7fef2edf7c
commit e9ba16e68c
1 changed files with 1 additions and 1 deletions
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2
kernel/smpboot.c
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@ -47,7 +47,7 @@ void __init idle_thread_set_boot_cpu(void)
*
* Creates the thread if it does not exist.
*/
static inline void idle_init(unsigned int cpu)
static inline void __always_inline idle_init(unsigned int cpu)
{
struct task_struct *tsk = per_cpu(idle_threads, cpu);