linux-kernel - [tip: objtool/core] x86/orc: Make the is_callthunk() definition depend on CONFIG_BPF

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Date:   Fri, 09 Jun 2023 09:18:13 -0000
From:   "tip-bot2 for Ingo Molnar" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org
Subject: [tip: objtool/core] x86/orc: Make the is_callthunk() definition
 depend on CONFIG_BPF_JIT=y

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

Commit-ID:     301cf77e21317b3465c5e2bb0188df24bbf1c2e2
Gitweb:        https://git.kernel.org/tip/301cf77e21317b3465c5e2bb0188df24bbf1c2e2
Author:        Ingo Molnar <mingo@...nel.org>
AuthorDate:    Fri, 09 Jun 2023 11:04:53 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Fri, 09 Jun 2023 11:09:04 +02:00

x86/orc: Make the is_callthunk() definition depend on CONFIG_BPF_JIT=y

Recent commit:

  020126239b8f Revert "x86/orc: Make it callthunk aware"

Made the only user of is_callthunk() depend on CONFIG_BPF_JIT=y, while
the definition of the helper function is unconditional.

Move is_callthunk() inside the #ifdef block.

Addresses this build failure:

   arch/x86/kernel/callthunks.c:296:13: error: ‘is_callthunk’ defined but not used [-Werror=unused-function]

Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Josh Poimboeuf <jpoimboe@...nel.org>
Cc: linux-kernel@...r.kernel.org
Cc: Peter Zijlstra <peterz@...radead.org>
---
 arch/x86/kernel/callthunks.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/callthunks.c b/arch/x86/kernel/callthunks.c
index 8e0a9b6..fcb8eea 100644
--- a/arch/x86/kernel/callthunks.c
+++ b/arch/x86/kernel/callthunks.c
@@ -293,6 +293,7 @@ void *callthunks_translate_call_dest(void *dest)
 	return target ? : dest;
 }
 
+#ifdef CONFIG_BPF_JIT
 static bool is_callthunk(void *addr)
 {
 	unsigned int tmpl_size = SKL_TMPL_SIZE;
@@ -306,7 +307,6 @@ static bool is_callthunk(void *addr)
 	return !bcmp((void *)(dest - tmpl_size), tmpl, tmpl_size);
 }
 
-#ifdef CONFIG_BPF_JIT
 int x86_call_depth_emit_accounting(u8 **pprog, void *func)
 {
 	unsigned int tmpl_size = SKL_TMPL_SIZE;