0

Normally, the compiler warns if a variable is declared but is never referenced. In the Linux kernel source code, some unused functions and variables are marked __atrribute__((unused)).

==> https://livegrep.com/search/linux?q=__attribute__((unused))

GCC, on the other hand, does not provide any warnings for these unused and unmarked variables like the integer flags in kernel/sched/idle.c#427 .

Why?

0x80000000
  • 29
  • 4
  • 2
    because the flags used in kernel compilation don't include `-Wunused-parameter` or `-Wextra` or similar which would warn about this. – bolov Feb 20 '22 at 06:46

1 Answers1

2

Problem solved:

Because we do not enable that build warning as it is mostly useless for kernel code due to how different apis work inside the kernel.

Try enabling it yourself and see all of the noise that happens.

----

greg k-h

yugr
  • 19,769
  • 3
  • 51
  • 96
0x80000000
  • 29
  • 4