3.16.56-rc1 review patch.  If anyone has any objections, please let me know.


From: Andi Kleen <a...@linux.intel.com>

commit 7614e913db1f40fff819b36216484dc3808995d4 upstream.

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

Signed-off-by: Andi Kleen <a...@linux.intel.com>
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Acked-by: Arjan van de Ven <ar...@linux.intel.com>
Acked-by: Ingo Molnar <mi...@kernel.org>
Cc: gno...@lxorguk.ukuu.org.uk
Cc: Rik van Riel <r...@redhat.com>
Cc: Josh Poimboeuf <jpoim...@redhat.com>
Cc: thomas.lenda...@amd.com
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Jiri Kosina <ji...@kernel.org>
Cc: Andy Lutomirski <l...@amacapital.net>
Cc: Dave Hansen <dave.han...@intel.com>
Cc: Kees Cook <keesc...@google.com>
Cc: Tim Chen <tim.c.c...@linux.intel.com>
Cc: Greg Kroah-Hartman <gre...@linux-foundation.org>
Cc: Paul Turner <p...@google.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
 arch/x86/kernel/irq_32.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- 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/nospec-branch.h>
 DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
@@ -61,11 +62,11 @@ DEFINE_PER_CPU(struct irq_stack *, softi
 static void call_on_stack(void *func, void *stack)
        asm volatile("xchgl     %%ebx,%%esp     \n"
-                    "call      *%%edi          \n"
+                    CALL_NOSPEC
                     "movl      %%ebx,%%esp     \n"
                     : "=b" (stack)
                     : "0" (stack),
-                      "D"(func)
+                      [thunk_target] "D"(func)
                     : "memory", "cc", "edx", "ecx", "eax");
@@ -102,11 +103,11 @@ execute_on_irq_stack(int overflow, struc
                call_on_stack(print_stack_overflow, isp);
        asm volatile("xchgl     %%ebx,%%esp     \n"
-                    "call      *%%edi          \n"
+                    CALL_NOSPEC
                     "movl      %%ebx,%%esp     \n"
                     : "=a" (arg1), "=d" (arg2), "=b" (isp)
                     :  "0" (irq),   "1" (desc),  "2" (isp),
-                       "D" (desc->handle_irq)
+                       [thunk_target] "D" (desc->handle_irq)
                     : "memory", "cc", "ecx");
        return 1;

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