linux-kernel - [patch 21/38] x86/entry: Make some entry symbols global

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Date:   Sun, 17 Jul 2022 01:17:43 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Linus Torvalds <torvalds@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Andrew Cooper <Andrew.Cooper3@...rix.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Johannes Wikner <kwikner@...z.ch>,
        Alyssa Milburn <alyssa.milburn@...ux.intel.com>,
        Jann Horn <jannh@...gle.com>, "H.J. Lu" <hjl.tools@...il.com>,
        Joao Moreira <joao.moreira@...el.com>,
        Joseph Nuzman <joseph.nuzman@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: [patch 21/38] x86/entry: Make some entry symbols global

paranoid_entry(), error_entry() and xen_error_entry() have to be
exempted from call accounting by thunk patching because they are
before UNTRAIN_RET.

Expose them so they are available in the alternative code.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/entry/entry_64.S |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -326,7 +326,8 @@ SYM_CODE_END(ret_from_fork)
 #endif
 .endm
 
-SYM_CODE_START_LOCAL(xen_error_entry)
+SYM_CODE_START(xen_error_entry)
+	ANNOTATE_NOENDBR
 	UNWIND_HINT_FUNC
 	PUSH_AND_CLEAR_REGS save_ret=1
 	ENCODE_FRAME_POINTER 8
@@ -904,7 +905,8 @@ SYM_CODE_END(xen_failsafe_callback)
  * R14 - old CR3
  * R15 - old SPEC_CTRL
  */
-SYM_CODE_START_LOCAL(paranoid_entry)
+SYM_CODE_START(paranoid_entry)
+	ANNOTATE_NOENDBR
 	UNWIND_HINT_FUNC
 	PUSH_AND_CLEAR_REGS save_ret=1
 	ENCODE_FRAME_POINTER 8
@@ -1039,7 +1041,8 @@ SYM_CODE_END(paranoid_exit)
 /*
  * Switch GS and CR3 if needed.
  */
-SYM_CODE_START_LOCAL(error_entry)
+SYM_CODE_START(error_entry)
+	ANNOTATE_NOENDBR
 	UNWIND_HINT_FUNC
 
 	PUSH_AND_CLEAR_REGS save_ret=1