diff mbox series

[4.14,03/24] ARM: bugs: hook processor bug checking into SMP and suspend paths

Message ID 1539617538-22328-4-git-send-email-dave.long@linaro.org
State Superseded
Headers show
Series V4.14 backport of 32-bit arm spectre patches | expand

Commit Message

David Long Oct. 15, 2018, 3:31 p.m. UTC 
From: Russell King <rmk+kernel@armlinux.org.uk>


Commit 26602161b5ba795928a5a719fe1d5d9f2ab5c3ef upstream.

Check for CPU bugs when secondary processors are being brought online,
and also when CPUs are resuming from a low power mode.  This gives an
opportunity to check that processor specific bug workarounds are
correctly enabled for all paths that a CPU re-enters the kernel.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>

Boot-tested-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>

Acked-by: Marc Zyngier <marc.zyngier@arm.com>

Signed-off-by: David A. Long <dave.long@linaro.org>

---
 arch/arm/include/asm/bugs.h | 2 ++
 arch/arm/kernel/bugs.c      | 5 +++++
 arch/arm/kernel/smp.c       | 4 ++++
 arch/arm/kernel/suspend.c   | 2 ++
 4 files changed, 13 insertions(+)

-- 
2.5.0
diff mbox series

Patch

diff --git a/arch/arm/include/asm/bugs.h b/arch/arm/include/asm/bugs.h
index ed122d2..73a99c7 100644
--- a/arch/arm/include/asm/bugs.h
+++ b/arch/arm/include/asm/bugs.h
@@ -14,8 +14,10 @@  extern void check_writebuffer_bugs(void);
 
 #ifdef CONFIG_MMU
 extern void check_bugs(void);
+extern void check_other_bugs(void);
 #else
 #define check_bugs() do { } while (0)
+#define check_other_bugs() do { } while (0)
 #endif
 
 #endif
diff --git a/arch/arm/kernel/bugs.c b/arch/arm/kernel/bugs.c
index 8802402..16e7ba2 100644
--- a/arch/arm/kernel/bugs.c
+++ b/arch/arm/kernel/bugs.c
@@ -3,7 +3,12 @@ 
 #include <asm/bugs.h>
 #include <asm/proc-fns.h>
 
+void check_other_bugs(void)
+{
+}
+
 void __init check_bugs(void)
 {
 	check_writebuffer_bugs();
+	check_other_bugs();
 }
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index c9a0a52..e61af06 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -31,6 +31,7 @@ 
 #include <linux/irq_work.h>
 
 #include <linux/atomic.h>
+#include <asm/bugs.h>
 #include <asm/smp.h>
 #include <asm/cacheflush.h>
 #include <asm/cpu.h>
@@ -402,6 +403,9 @@  asmlinkage void secondary_start_kernel(void)
 	 * before we continue - which happens after __cpu_up returns.
 	 */
 	set_cpu_online(cpu, true);
+
+	check_other_bugs();
+
 	complete(&cpu_running);
 
 	local_irq_enable();
diff --git a/arch/arm/kernel/suspend.c b/arch/arm/kernel/suspend.c
index a40ebb7..d080992 100644
--- a/arch/arm/kernel/suspend.c
+++ b/arch/arm/kernel/suspend.c
@@ -3,6 +3,7 @@ 
 #include <linux/slab.h>
 #include <linux/mm_types.h>
 
+#include <asm/bugs.h>
 #include <asm/cacheflush.h>
 #include <asm/idmap.h>
 #include <asm/pgalloc.h>
@@ -36,6 +37,7 @@  int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
 		cpu_switch_mm(mm->pgd, mm);
 		local_flush_bp_all();
 		local_flush_tlb_all();
+		check_other_bugs();
 	}
 
 	return ret;