arch/s390/kernel/ipl.c:1973 sys_vmcmd_on_reboot_store() warn: unsigned 'len' is never less than zero.

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0babf683783ddca06551537c6781e413cfe8d27b
commit: 247576bf624a200b9d4dba6126e760af0d5ebe0e s390/ipl: Do not accept z/VM CP diag X'008' cmds longer than max length
date:   4 months ago
config: s390-randconfig-r072-20240915 (https://download.01.org/0day-ci/archive/20240915/202409150811.A0rDxG88-lkp@xxxxxxxxx/config)
compiler: s390-linux-gcc (GCC) 14.1.0

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409150811.A0rDxG88-lkp@xxxxxxxxx/

smatch warnings:
arch/s390/kernel/ipl.c:1973 sys_vmcmd_on_reboot_store() warn: unsigned 'len' is never less than zero.
arch/s390/kernel/ipl.c:1974 sys_vmcmd_on_panic_store() warn: unsigned 'len' is never less than zero.
arch/s390/kernel/ipl.c:1975 sys_vmcmd_on_halt_store() warn: unsigned 'len' is never less than zero.
arch/s390/kernel/ipl.c:1976 sys_vmcmd_on_poff_store() warn: unsigned 'len' is never less than zero.
arch/s390/kernel/ipl.c:1977 sys_vmcmd_on_restart_store() warn: unsigned 'len' is never less than zero.

vim +/len +1973 arch/s390/kernel/ipl.c

99ca4e582d4a40 Michael Holzheu 2008-01-26  1972  
99ca4e582d4a40 Michael Holzheu 2008-01-26 @1973  DEFINE_IPL_ATTR_STR_RW(vmcmd, on_reboot, "%s\n", "%s\n", vmcmd_on_reboot);
99ca4e582d4a40 Michael Holzheu 2008-01-26 @1974  DEFINE_IPL_ATTR_STR_RW(vmcmd, on_panic, "%s\n", "%s\n", vmcmd_on_panic);
99ca4e582d4a40 Michael Holzheu 2008-01-26 @1975  DEFINE_IPL_ATTR_STR_RW(vmcmd, on_halt, "%s\n", "%s\n", vmcmd_on_halt);
99ca4e582d4a40 Michael Holzheu 2008-01-26 @1976  DEFINE_IPL_ATTR_STR_RW(vmcmd, on_poff, "%s\n", "%s\n", vmcmd_on_poff);
7dd6b3343fdc19 Michael Holzheu 2011-08-03 @1977  DEFINE_IPL_ATTR_STR_RW(vmcmd, on_restart, "%s\n", "%s\n", vmcmd_on_restart);
99ca4e582d4a40 Michael Holzheu 2008-01-26  1978  

:::::: The code at line 1973 was first introduced by commit
:::::: 99ca4e582d4a4088969681efff97be44d98421a1 [S390] kernel: Shutdown Actions Interface

:::::: TO: Michael Holzheu <holzheu@xxxxxxxxxx>
:::::: CC: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

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