diff options
author | Jonathan Corbet <corbet@lwn.net> | 2016-11-18 16:13:41 -0700 |
---|---|---|
committer | Jonathan Corbet <corbet@lwn.net> | 2016-11-18 16:13:41 -0700 |
commit | 917fef6f7ee8b2fe852692ac49771342bfef9433 (patch) | |
tree | b5932aab90d449841803b6f8679a4564ca2a6eaf /arch/arm64/mm/fault.c | |
parent | 0c9aa209579d41c9b8bf1fc39ce042bea2ec422d (diff) | |
parent | bc33b0ca11e3df467777a4fa7639ba488c9d4911 (diff) |
Merge tag 'v4.9-rc4' into sound
Bring in -rc4 patches so I can successfully merge the sound doc changes.
Diffstat (limited to 'arch/arm64/mm/fault.c')
-rw-r--r-- | arch/arm64/mm/fault.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 53d9159662fe..0f8788374815 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -29,7 +29,9 @@ #include <linux/sched.h> #include <linux/highmem.h> #include <linux/perf_event.h> +#include <linux/preempt.h> +#include <asm/bug.h> #include <asm/cpufeature.h> #include <asm/exception.h> #include <asm/debug-monitors.h> @@ -670,9 +672,17 @@ asmlinkage int __exception do_debug_exception(unsigned long addr, NOKPROBE_SYMBOL(do_debug_exception); #ifdef CONFIG_ARM64_PAN -void cpu_enable_pan(void *__unused) +int cpu_enable_pan(void *__unused) { + /* + * We modify PSTATE. This won't work from irq context as the PSTATE + * is discarded once we return from the exception. + */ + WARN_ON_ONCE(in_interrupt()); + config_sctlr_el1(SCTLR_EL1_SPAN, 0); + asm(SET_PSTATE_PAN(1)); + return 0; } #endif /* CONFIG_ARM64_PAN */ @@ -683,8 +693,9 @@ void cpu_enable_pan(void *__unused) * We need to enable the feature at runtime (instead of adding it to * PSR_MODE_EL1h) as the feature may not be implemented by the cpu. */ -void cpu_enable_uao(void *__unused) +int cpu_enable_uao(void *__unused) { asm(SET_PSTATE_UAO(1)); + return 0; } #endif /* CONFIG_ARM64_UAO */ |