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

Commit 26602161b5 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Russell King 2018-10-15 11:31:57 -04:00 committed by Greg Kroah-Hartman
parent 9a42b70744
commit c7825c277b
4 changed files with 13 additions and 0 deletions
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2
arch/arm/include/asm/bugs.h
View File

@ -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

5
arch/arm/kernel/bugs.c
View File

@ -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();
}

4
arch/arm/kernel/smp.c
View File

@ -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();

2
arch/arm/kernel/suspend.c
View File

@ -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;