[tip:x86/mm] x86/mm/cpa: Move CLFLUSH test into cpa_flush_range()

From: tip-bot for Peter Zijlstra
Date: Thu Sep 27 2018 - 14:55:01 EST


Commit-ID: 5f464b33b17219a233af1267c621632225bc7acc
Gitweb: https://git.kernel.org/tip/5f464b33b17219a233af1267c621632225bc7acc
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Wed, 19 Sep 2018 10:50:21 +0200
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Thu, 27 Sep 2018 20:39:41 +0200

x86/mm/cpa: Move CLFLUSH test into cpa_flush_range()

Rather than guarding all cpa_flush_range() uses with a CLFLUSH test,
put it inside.

Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Bin Yang <bin.yang@xxxxxxxxx>
Cc: Mark Gross <mark.gross@xxxxxxxxx>
Link: https://lkml.kernel.org/r/20180919085948.036195503@xxxxxxxxxxxxx

---
arch/x86/mm/pageattr.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 02eb18403594..3cc4a2ae4dbb 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -293,6 +293,11 @@ static void cpa_flush_range(unsigned long start, int numpages, int cache)
BUG_ON(irqs_disabled() && !early_boot_irqs_disabled);
WARN_ON(PAGE_ALIGN(start) != start);

+ if (!static_cpu_has(X86_FEATURE_CLFLUSH)) {
+ cpa_flush_all(cache);
+ return;
+ }
+
flush_tlb_kernel_range(start, start + PAGE_SIZE * numpages);

if (!cache)
@@ -2078,10 +2083,7 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc)
/*
* Before changing the encryption attribute, we need to flush caches.
*/
- if (static_cpu_has(X86_FEATURE_CLFLUSH))
- cpa_flush_range(start, numpages, 1);
- else
- cpa_flush_all(1);
+ cpa_flush_range(start, numpages, 1);

ret = __change_page_attr_set_clr(&cpa, 1);

@@ -2092,10 +2094,7 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc)
* in case TLB flushing gets optimized in the cpa_flush_range()
* path use the same logic as above.
*/
- if (static_cpu_has(X86_FEATURE_CLFLUSH))
- cpa_flush_range(start, numpages, 0);
- else
- cpa_flush_all(0);
+ cpa_flush_range(start, numpages, 0);

return ret;
}