[PATCH 5/9] x86/nmi: Fix comment in unknown NMI handling

[Sohil Mehta <sohil.mehta@intel.com>]

The comment in unknown NMI handling is incorrect and misleading. There
is no longer a restriction on having a single Unknown NMI handler. Also,
nmi_handle() does not use the 'b2b' parameter anymore.

The changes that made the comment outdated are:

commit 0d443b70cc92 ("x86/platform: Remove warning message for duplicate
NMI handlers")

commit bf9f2ee28d47 ("x86/nmi: Remove the 'b2b' parameter from
nmi_handle()")

Remove the old comment and update it to reflect the current intention.

Signed-off-by: Sohil Mehta <sohil.mehta@intel.com>
---
 arch/x86/kernel/nmi.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c
index cdfb3864d59a..2a07c9adc6a6 100644
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -327,10 +327,9 @@ unknown_nmi_error(unsigned char reason, struct pt_regs *regs)
 	int handled;
 
 	/*
-	 * Use 'false' as back-to-back NMIs are dealt with one level up.
-	 * Of course this makes having multiple 'unknown' handlers useless
-	 * as only the first one is ever run (unless it can actually determine
-	 * if it caused the NMI)
+	 * As a last resort, let the "unknown" handlers make a
+	 * best-effort attempt to figure out if they can claim
+	 * responsibility for this Unknown NMI.
 	 */
 	handled = nmi_handle(NMI_UNKNOWN, regs);
 	if (handled) {
-- 
2.43.0