linux-kernel - [tip: x86/urgent] x86/entry: Add compatibility with IAS

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Message-ID: <159491343466.4006.9823116110789109364.tip-bot2@tip-bot2>
Date:   Thu, 16 Jul 2020 15:30:34 -0000
From:   "tip-bot2 for Jian Cai" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Brian Gerst <brgerst@...il.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Jian Cai <caij2003@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/urgent] x86/entry: Add compatibility with IAS

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     6ee93f8df09c470da1a4af11e394c52d7b62418c
Gitweb:        https://git.kernel.org/tip/6ee93f8df09c470da1a4af11e394c52d7b62418c
Author:        Jian Cai <caij2003@...il.com>
AuthorDate:    Tue, 14 Jul 2020 16:30:21 -07:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 16 Jul 2020 17:25:09 +02:00

x86/entry: Add compatibility with IAS

Clang's integrated assembler does not allow symbols with non-absolute
values to be reassigned. Modify the interrupt entry loop macro to be
compatible with IAS by using a label and an offset.

Reported-by: Nick Desaulniers <ndesaulniers@...gle.com>
Reported-by: Sedat Dilek <sedat.dilek@...il.com>
Suggested-by: Nick Desaulniers <ndesaulniers@...gle.com>
Suggested-by: Brian Gerst <brgerst@...il.com>
Suggested-by: Arvind Sankar <nivedita@...m.mit.edu>
Signed-off-by: Jian Cai <caij2003@...il.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Sedat Dilek <sedat.dilek@...il.com> #
Link: https://github.com/ClangBuiltLinux/linux/issues/1043
Link: https://lkml.kernel.org/r/20200714233024.1789985-1-caij2003@gmail.com
---
 arch/x86/include/asm/idtentry.h | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index f3d7083..5efaaed 100644
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -469,16 +469,15 @@ __visible noinstr void func(struct pt_regs *regs,			\
 	.align 8
 SYM_CODE_START(irq_entries_start)
     vector=FIRST_EXTERNAL_VECTOR
-    pos = .
     .rept (FIRST_SYSTEM_VECTOR - FIRST_EXTERNAL_VECTOR)
 	UNWIND_HINT_IRET_REGS
+0 :
 	.byte	0x6a, vector
 	jmp	asm_common_interrupt
 	nop
 	/* Ensure that the above is 8 bytes max */
-	. = pos + 8
-    pos=pos+8
-    vector=vector+1
+	. = 0b + 8
+	vector = vector+1
     .endr
 SYM_CODE_END(irq_entries_start)
 
@@ -486,16 +485,15 @@ SYM_CODE_END(irq_entries_start)
 	.align 8
 SYM_CODE_START(spurious_entries_start)
     vector=FIRST_SYSTEM_VECTOR
-    pos = .
     .rept (NR_VECTORS - FIRST_SYSTEM_VECTOR)
 	UNWIND_HINT_IRET_REGS
+0 :
 	.byte	0x6a, vector
 	jmp	asm_spurious_interrupt
 	nop
 	/* Ensure that the above is 8 bytes max */
-	. = pos + 8
-    pos=pos+8
-    vector=vector+1
+	. = 0b + 8
+	vector = vector+1
     .endr
 SYM_CODE_END(spurious_entries_start)
 #endif