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x86/fault: Document the locking in the fault_signal_pending() path
If fault_signal_pending() returns true, then the core mm has unlocked the mm for us. Add a comment to help future readers of this code. Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/c56de3d103f40e6304437b150aa7b215530d23f7.1612924255.git.luto@kernel.org
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@ -1380,8 +1380,11 @@ void do_user_addr_fault(struct pt_regs *regs,
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*/
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fault = handle_mm_fault(vma, address, flags, regs);
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/* Quick path to respond to signals */
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if (fault_signal_pending(fault, regs)) {
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/*
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* Quick path to respond to signals. The core mm code
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* has unlocked the mm for us if we get here.
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*/
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if (!user_mode(regs))
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no_context(regs, error_code, address, SIGBUS,
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BUS_ADRERR);
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