linux-kernel - [PATCH v2 12/59] x86/entry: Align SYM_CODE

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Date:   Fri, 02 Sep 2022 15:06:37 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org, 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>,
        Juergen Gross <jgross@...e.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v2 12/59] x86/entry: Align SYM_CODE_START() variants

From: Thomas Gleixner <tglx@...utronix.de>

Explicitly align a bunch of commonly called SYM_CODE_START() symbols.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/x86/entry/entry_64.S |   12 ++++++++----
 arch/x86/entry/thunk_64.S |    4 ++--
 2 files changed, 10 insertions(+), 6 deletions(-)

--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -284,7 +284,8 @@ SYM_FUNC_END(__switch_to_asm)
  * r12: kernel thread arg
  */
 .pushsection .text, "ax"
-SYM_CODE_START(ret_from_fork)
+	__FUNC_ALIGN
+SYM_CODE_START_NOALIGN(ret_from_fork)
 	UNWIND_HINT_EMPTY
 	ANNOTATE_NOENDBR // copy_thread
 	movq	%rax, %rdi
@@ -828,7 +829,8 @@ EXPORT_SYMBOL(asm_load_gs_index)
  *
  * C calling convention: exc_xen_hypervisor_callback(struct *pt_regs)
  */
-SYM_CODE_START_LOCAL(exc_xen_hypervisor_callback)
+	__FUNC_ALIGN
+SYM_CODE_START_LOCAL_NOALIGN(exc_xen_hypervisor_callback)
 
 /*
  * Since we don't modify %rdi, evtchn_do_upall(struct *pt_regs) will
@@ -856,7 +858,8 @@ SYM_CODE_END(exc_xen_hypervisor_callback
  * We distinguish between categories by comparing each saved segment register
  * with its current contents: any discrepancy means we in category 1.
  */
-SYM_CODE_START(xen_failsafe_callback)
+	__FUNC_ALIGN
+SYM_CODE_START_NOALIGN(xen_failsafe_callback)
 	UNWIND_HINT_EMPTY
 	ENDBR
 	movl	%ds, %ecx
@@ -1516,7 +1519,8 @@ SYM_CODE_END(ignore_sysret)
 #endif
 
 .pushsection .text, "ax"
-SYM_CODE_START(rewind_stack_and_make_dead)
+	__FUNC_ALIGN
+SYM_CODE_START_NOALIGN(rewind_stack_and_make_dead)
 	UNWIND_HINT_FUNC
 	/* Prevent any naive code from trying to unwind to our caller. */
 	xorl	%ebp, %ebp
--- a/arch/x86/entry/thunk_64.S
+++ b/arch/x86/entry/thunk_64.S
@@ -11,7 +11,7 @@
 
 	/* rdi:	arg1 ... normal C conventions. rax is saved/restored. */
 	.macro THUNK name, func
-SYM_FUNC_START_NOALIGN(\name)
+SYM_FUNC_START(\name)
 	pushq %rbp
 	movq %rsp, %rbp
 
@@ -36,7 +36,7 @@ SYM_FUNC_END(\name)
 	EXPORT_SYMBOL(preempt_schedule_thunk)
 	EXPORT_SYMBOL(preempt_schedule_notrace_thunk)
 
-SYM_CODE_START_LOCAL_NOALIGN(__thunk_restore)
+SYM_CODE_START_LOCAL(__thunk_restore)
 	popq %r11
 	popq %r10
 	popq %r9