4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Thomas Gleixner tglx@linutronix.de
commit 0270be3e34efb05a88bc4c422572ece038ef3608 upstream
The upcoming support for the virtual SPEC_CTRL MSR on AMD needs to reuse speculative_store_bypass_update() to avoid code duplication. Add an argument for supplying a thread info (TIF) value and create a wrapper speculative_store_bypass_update_current() which is used at the existing call site.
Signed-off-by: Thomas Gleixner tglx@linutronix.de Reviewed-by: Borislav Petkov bp@suse.de Reviewed-by: Konrad Rzeszutek Wilk konrad.wilk@oracle.com Signed-off-by: David Woodhouse dwmw@amazon.co.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/include/asm/spec-ctrl.h | 7 ++++++- arch/x86/kernel/cpu/bugs.c | 2 +- arch/x86/kernel/process.c | 4 ++-- 3 files changed, 9 insertions(+), 4 deletions(-)
--- a/arch/x86/include/asm/spec-ctrl.h +++ b/arch/x86/include/asm/spec-ctrl.h @@ -42,6 +42,11 @@ extern void speculative_store_bypass_ht_ static inline void speculative_store_bypass_ht_init(void) { } #endif
-extern void speculative_store_bypass_update(void); +extern void speculative_store_bypass_update(unsigned long tif); + +static inline void speculative_store_bypass_update_current(void) +{ + speculative_store_bypass_update(current_thread_info()->flags); +}
#endif --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -597,7 +597,7 @@ static int ssb_prctl_set(struct task_str * mitigation until it is next scheduled. */ if (task == current && update) - speculative_store_bypass_update(); + speculative_store_bypass_update_current();
return 0; } --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -338,10 +338,10 @@ static __always_inline void __speculativ intel_set_ssb_state(tifn); }
-void speculative_store_bypass_update(void) +void speculative_store_bypass_update(unsigned long tif) { preempt_disable(); - __speculative_store_bypass_update(current_thread_info()->flags); + __speculative_store_bypass_update(tif); preempt_enable(); }