linux-kernel - [PATCH v2 08/12] x86/retpoline/irq32: Convert assembler indirect jumps

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Date:   Wed,  3 Jan 2018 18:00:15 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     tglx@...utronix.de
Cc:     torvalds@...ux-foundation.org, gregkh@...ux-foundation.org,
        linux-kernel@...r.kernel.org, tim.c.chen@...ux.intel.com,
        Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH v2 08/12] x86/retpoline/irq32: Convert assembler indirect jumps

From: Andi Kleen <ak@...ux.intel.com>

Convert all indirect jumps in 32bit irq inline asm code to use
non speculative sequences.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 arch/x86/kernel/irq_32.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index a83b3346a0e1..2dce2fdd2c4e 100644
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -20,6 +20,7 @@
 #include <linux/mm.h>
 
 #include <asm/apic.h>
+#include <asm/jump-asm.h>
 
 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 
@@ -55,7 +56,7 @@ DEFINE_PER_CPU(struct irq_stack *, softirq_stack);
 static void call_on_stack(void *func, void *stack)
 {
 	asm volatile("xchgl	%%ebx,%%esp	\n"
-		     "call	*%%edi		\n"
+		     NOSPEC_CALL("%%edi")
 		     "movl	%%ebx,%%esp	\n"
 		     : "=b" (stack)
 		     : "0" (stack),
@@ -95,7 +96,7 @@ static inline int execute_on_irq_stack(int overflow, struct irq_desc *desc)
 		call_on_stack(print_stack_overflow, isp);
 
 	asm volatile("xchgl	%%ebx,%%esp	\n"
-		     "call	*%%edi		\n"
+		     NOSPEC_CALL("%%edi")
 		     "movl	%%ebx,%%esp	\n"
 		     : "=a" (arg1), "=b" (isp)
 		     :  "0" (desc),   "1" (isp),
-- 
2.14.3