ARM: bugs: hook processor bug checking into SMP and suspend paths

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>

diff --git a/arch/arm/include/asm/bugs.h b/arch/arm/include/asm/bugs.h
index ed122d2..73a99c7 100644 (file)
--- 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 (file)
--- 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 2da0879..5ad0b67 100644 (file)
--- 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>
@@ -405,6 +406,9 @@ 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 (file)
--- 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;