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x86/ptrace: Always inline v8086_mode() for instrumentation

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Instrumentation glue like KASAN causes the following warning:

  vmlinux.o: warning: objtool: mce_gather_info()+0x5f: call to v8086_mode.constprop.0() leaves .noinstr.text section

due to gcc creating a function call for that oneliner. Force-inline it
and even save some vmlinux bytes (.config is close to an allmodconfig):

     text    data     bss     dec     hex filename
  209431677       208257651       34411048        452100376       1af28118	vmlinux.before
  209431519       208257615       34411048        452100182       1af28056	vmlinux.after

Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Marco Elver <elver@google.com>
Link: https://lore.kernel.org/r/20220204083015.17317-3-bp@alien8.de
This commit is contained in:
Borislav Petkov 2022-02-04 09:30:14 +01:00
parent f5c54f77b0
commit b008893b08
1 changed files with 1 additions and 1 deletions
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2
arch/x86/include/asm/ptrace.h
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@ -137,7 +137,7 @@ static __always_inline int user_mode(struct pt_regs *regs)
#endif
}
static inline int v8086_mode(struct pt_regs *regs)
static __always_inline int v8086_mode(struct pt_regs *regs)
{
#ifdef CONFIG_X86_32
return (regs->flags & X86_VM_MASK);