diff options
author | David S. Miller <davem@davemloft.net> | 2017-10-30 14:10:01 +0900 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2017-10-30 21:09:24 +0900 |
commit | e1ea2f9856b765a2eaabb403a6751f70efc9ba4c (patch) | |
tree | 771f0f96fdab1b27757730e96d911c73f5499ee4 /arch/x86/include/asm/tlbflush.h | |
parent | aad93c70b9a3b80dbc383a31e77a119f69bdd856 (diff) | |
parent | 0b07194bb55ed836c2cc7c22e866b87a14681984 (diff) | |
download | op-kernel-dev-e1ea2f9856b765a2eaabb403a6751f70efc9ba4c.zip op-kernel-dev-e1ea2f9856b765a2eaabb403a6751f70efc9ba4c.tar.gz |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Several conflicts here.
NFP driver bug fix adding nfp_netdev_is_nfp_repr() check to
nfp_fl_output() needed some adjustments because the code block is in
an else block now.
Parallel additions to net/pkt_cls.h and net/sch_generic.h
A bug fix in __tcp_retransmit_skb() conflicted with some of
the rbtree changes in net-next.
The tc action RCU callback fixes in 'net' had some overlap with some
of the recent tcf_block reworking.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/x86/include/asm/tlbflush.h')
-rw-r--r-- | arch/x86/include/asm/tlbflush.h | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h index d362161..c4aed0d 100644 --- a/arch/x86/include/asm/tlbflush.h +++ b/arch/x86/include/asm/tlbflush.h @@ -82,12 +82,21 @@ static inline u64 inc_mm_tlb_gen(struct mm_struct *mm) #define __flush_tlb_single(addr) __native_flush_tlb_single(addr) #endif -/* - * If tlb_use_lazy_mode is true, then we try to avoid switching CR3 to point - * to init_mm when we switch to a kernel thread (e.g. the idle thread). If - * it's false, then we immediately switch CR3 when entering a kernel thread. - */ -DECLARE_STATIC_KEY_TRUE(tlb_use_lazy_mode); +static inline bool tlb_defer_switch_to_init_mm(void) +{ + /* + * If we have PCID, then switching to init_mm is reasonably + * fast. If we don't have PCID, then switching to init_mm is + * quite slow, so we try to defer it in the hopes that we can + * avoid it entirely. The latter approach runs the risk of + * receiving otherwise unnecessary IPIs. + * + * This choice is just a heuristic. The tlb code can handle this + * function returning true or false regardless of whether we have + * PCID. + */ + return !static_cpu_has(X86_FEATURE_PCID); +} /* * 6 because 6 should be plenty and struct tlb_state will fit in |