linux-kernel - [PATCH 7/8] x86/mm/cpa: Factor common code between cpa_flush

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Message-ID: <20180919085948.138859183@infradead.org>
Date:   Wed, 19 Sep 2018 10:50:23 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Bin Yang <bin.yang@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Mark Gross <mark.gross@...el.com>
Subject: [PATCH 7/8] x86/mm/cpa: Factor common code between cpa_flush_*()

The start of cpa_flush_range() and cpa_flush_array() is the same, use
a common function.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/x86/mm/pageattr.c |   29 +++++++++++++----------------
 1 file changed, 13 insertions(+), 16 deletions(-)

--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -285,22 +285,28 @@ static void cpa_flush_all(unsigned long
 	on_each_cpu(__cpa_flush_all, (void *) cache, 1);
 }
 
-static void cpa_flush_range(unsigned long start, int numpages, int cache)
+static bool __cpa_flush_range(unsigned long start, int numpages, int cache)
 {
-	unsigned int i, level;
-	unsigned long addr;
-
 	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;
+		return true;
 	}
 
 	flush_tlb_kernel_range(start, start + PAGE_SIZE * numpages);
 
-	if (!cache)
+	return !cache;
+}
+
+static void cpa_flush_range(unsigned long start, int numpages, int cache)
+{
+	unsigned int i, level;
+	unsigned long addr;
+
+	if (__cpa_flush_range(start, numpages, cache))
 		return;
 
 	/*
@@ -326,16 +332,7 @@ static void cpa_flush_array(unsigned lon
 {
 	unsigned int i, level;
 
-	BUG_ON(irqs_disabled() && !early_boot_irqs_disabled);
-
-	if (!static_cpu_has(X86_FEATURE_CLFLUSH)) {
-		cpa_flush_all(cache);
-		return;
-	}
-
-	flush_tlb_kernel_range(baddr, baddr + PAGE_SIZE * numpages);
-
-	if (!cache)
+	if (__cpa_flush_range(baddr, numpages, cache))
 		return;
 
 	/*