arch/x86/entry/common.c:527:24: warning: no previous prototype for 'do_SYSENTER_32'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6fd3ec5c7af58d5d6b598fba22ac387645af33f4
commit: d1721250f3ffed9afba3e1fb729947cec64c5a8a x86/entry: Move SYSENTER's regs->sp and regs->flags fixups into C
date:   1 year, 3 months ago
config: i386-randconfig-r036-20210927 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1721250f3ffed9afba3e1fb729947cec64c5a8a
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout d1721250f3ffed9afba3e1fb729947cec64c5a8a
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

   arch/x86/entry/common.c:280:24: warning: no previous prototype for 'prepare_exit_to_usermode' [-Wmissing-prototypes]
     280 | __visible noinstr void prepare_exit_to_usermode(struct pt_regs *regs)
         |                        ^~~~~~~~~~~~~~~~~~~~~~~~
   arch/x86/entry/common.c:342:24: warning: no previous prototype for 'syscall_return_slowpath' [-Wmissing-prototypes]
     342 | __visible noinstr void syscall_return_slowpath(struct pt_regs *regs)
         |                        ^~~~~~~~~~~~~~~~~~~~~~~
   arch/x86/entry/common.c:418:24: warning: no previous prototype for 'do_int80_syscall_32' [-Wmissing-prototypes]
     418 | __visible noinstr void do_int80_syscall_32(struct pt_regs *regs)
         |                        ^~~~~~~~~~~~~~~~~~~
   arch/x86/entry/common.c:463:24: warning: no previous prototype for 'do_fast_syscall_32' [-Wmissing-prototypes]
     463 | __visible noinstr long do_fast_syscall_32(struct pt_regs *regs)
         |                        ^~~~~~~~~~~~~~~~~~
>> arch/x86/entry/common.c:527:24: warning: no previous prototype for 'do_SYSENTER_32' [-Wmissing-prototypes]
     527 | __visible noinstr long do_SYSENTER_32(struct pt_regs *regs)
         |                        ^~~~~~~~~~~~~~


vim +/do_SYSENTER_32 +527 arch/x86/entry/common.c

   525	
   526	/* Returns 0 to return using IRET or 1 to return using SYSEXIT/SYSRETL. */
 > 527	__visible noinstr long do_SYSENTER_32(struct pt_regs *regs)
   528	{
   529		/* SYSENTER loses RSP, but the vDSO saved it in RBP. */
   530		regs->sp = regs->bp;
   531	
   532		/* SYSENTER clobbers EFLAGS.IF.  Assume it was set in usermode. */
   533		regs->flags |= X86_EFLAGS_IF;
   534	
   535		return do_fast_syscall_32(regs);
   536	}
   537	#endif
   538	

---
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