linux-kernel - [tip: objtool/core] context_tracking: Fix KCSAN noinstr violation

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Date:   Fri, 14 Apr 2023 14:47:56 -0000
From:   "tip-bot2 for Josh Poimboeuf" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Josh Poimboeuf <jpoimboe@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: objtool/core] context_tracking: Fix KCSAN noinstr violation

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     e8deb00c0c4808654d1bf96a8f79cf1deb59b631
Gitweb:        https://git.kernel.org/tip/e8deb00c0c4808654d1bf96a8f79cf1deb59b631
Author:        Josh Poimboeuf <jpoimboe@...nel.org>
AuthorDate:    Wed, 12 Apr 2023 10:24:06 -07:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 14 Apr 2023 16:08:27 +02:00

context_tracking: Fix KCSAN noinstr violation

With KCSAN enabled, even empty inline stubs can be out-of-lined.

Force the context_tracking_guest_exit() stub inline.

Fixes the following warnings:

  vmlinux.o: warning: objtool: vmx_vcpu_enter_exit+0x1be: call to context_tracking_guest_exit() leaves .noinstr.text section
  vmlinux.o: warning: objtool: svm_vcpu_enter_exit+0x85: call to context_tracking_guest_exit() leaves .noinstr.text section

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/dc93f45abdec90c171108b4b590b7fff5790963c.1681320026.git.jpoimboe@kernel.org
---
 include/linux/context_tracking.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index d4afa85..5ae3abd 100644
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -97,7 +97,7 @@ static inline int exception_enter(void) { return 0; }
 static inline void exception_exit(enum ctx_state prev_ctx) { }
 static inline int ct_state(void) { return -1; }
 static __always_inline bool context_tracking_guest_enter(void) { return false; }
-static inline void context_tracking_guest_exit(void) { }
+static __always_inline void context_tracking_guest_exit(void) { }
 #define CT_WARN_ON(cond) do { } while (0)
 #endif /* !CONFIG_CONTEXT_TRACKING_USER */