linux-kernel - [PATCH 1/2] x86/tlb/trace: Export the TLB_REMOTE_WRONG

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Message-Id: <20250528-tlb-trace-fix-v1-1-2e94c58f450d@columbia.edu>
Date: Wed, 28 May 2025 01:35:36 -0400
From: Tal Zussman <tz2294@...umbia.edu>
To: Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Ingo Molnar <mingo@...nel.org>, Rik van Riel <riel@...riel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
        x86@...nel.org
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        linux-mm@...ck.org, Tal Zussman <tz2294@...umbia.edu>
Subject: [PATCH 1/2] x86/tlb/trace: Export the TLB_REMOTE_WRONG_CPU enum

When the TLB_REMOTE_WRONG_CPU enum was introduced for the tlb_flush
tracepoint, the enum was not exported to userspace. Add it to the
appropriate macro definition to enable parsing by userspace tools, as
per [0].

[0] Link: https://lore.kernel.org/all/20150403013802.220157513@goodmis.org

Fixes: 2815a56e4b72 ("x86/mm/tlb: Add tracepoint for TLB flush IPI to stale CPU")
Signed-off-by: Tal Zussman <tz2294@...umbia.edu>
---
 include/trace/events/tlb.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/trace/events/tlb.h b/include/trace/events/tlb.h
index b4d8e7dc38f8..725a75720a23 100644
--- a/include/trace/events/tlb.h
+++ b/include/trace/events/tlb.h
@@ -13,7 +13,8 @@
 	EM(  TLB_REMOTE_SHOOTDOWN,	"remote shootdown" )		\
 	EM(  TLB_LOCAL_SHOOTDOWN,	"local shootdown" )		\
 	EM(  TLB_LOCAL_MM_SHOOTDOWN,	"local mm shootdown" )		\
-	EMe( TLB_REMOTE_SEND_IPI,	"remote ipi send" )
+	EM(  TLB_REMOTE_SEND_IPI,	"remote ipi send" )		\
+	EMe( TLB_REMOTE_WRONG_CPU,	"remote wrong CPU" )
 
 /*
  * First define the enums in TLB_FLUSH_REASON to be exported to userspace

-- 
2.39.5