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Message-ID: <20230809072201.394962649@infradead.org>
Date: Wed, 09 Aug 2023 09:12:32 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org, peterz@...radead.org,
David.Kaplan@....com, Andrew.Cooper3@...rix.com,
jpoimboe@...nel.org, gregkh@...uxfoundation.org
Subject: [RFC][PATCH 14/17] objtool: Add comments to the arch_is_$foo() magic symbols
Clarification was asked for...
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
tools/objtool/check.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1292,16 +1292,28 @@ static int add_ignore_alternatives(struc
return 0;
}
+/*
+ * Symbols that replace INSN_CALL_DYNAMIC, every (tail) call to such a symbol
+ * will be added to the .retpoline_sites section.
+ */
__weak bool arch_is_retpoline(struct symbol *sym)
{
return false;
}
+/*
+ * Symbols that replace INSN_RETURN, every (tail) call to such a symbol
+ * will be added to the .return_sites section.
+ */
__weak bool arch_is_rethunk(struct symbol *sym)
{
return false;
}
+/*
+ * Symbols that are embedded inside other instructions, because sometimes crazy
+ * code exists. These are mostly ignored for validation purposes.
+ */
__weak bool arch_is_offset_insn(struct symbol *sym)
{
return false;
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