linux-kernel - [PATCH v3 3/3] arm64: tlb: Allow range operation for MAX_TLBI_RANGE

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Date: Fri,  5 Apr 2024 13:58:52 +1000
From: Gavin Shan <gshan@...hat.com>
To: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: catalin.marinas@....com,
	will@...nel.org,
	gshan@...hat.com,
	akpm@...ux-foundation.org,
	maz@...nel.org,
	oliver.upton@...ux.dev,
	ryan.roberts@....com,
	apopple@...dia.com,
	rananta@...gle.com,
	mark.rutland@....com,
	v-songbaohua@...o.com,
	yangyicong@...ilicon.com,
	shahuang@...hat.com,
	yihyu@...hat.com,
	shan.gavin@...il.com
Subject: [PATCH v3 3/3] arm64: tlb: Allow range operation for MAX_TLBI_RANGE_PAGES

MAX_TLBI_RANGE_PAGES pages is covered by SCALE#3 and NUM#31 and it's
supported now. Allow TLBI RANGE operation when the number of pages is
equal to MAX_TLBI_RANGE_PAGES in __flush_tlb_range_nosync().

Suggested-by: Marc Zyngier <maz@...nel.org>
Signed-off-by: Gavin Shan <gshan@...hat.com>
---
 arch/arm64/include/asm/tlbflush.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
index 243d71f7bc1f..95fbc8c05607 100644
--- a/arch/arm64/include/asm/tlbflush.h
+++ b/arch/arm64/include/asm/tlbflush.h
@@ -446,11 +446,11 @@ static inline void __flush_tlb_range_nosync(struct vm_area_struct *vma,
 	 * When not uses TLB range ops, we can handle up to
 	 * (MAX_DVM_OPS - 1) pages;
 	 * When uses TLB range ops, we can handle up to
-	 * (MAX_TLBI_RANGE_PAGES - 1) pages.
+	 * MAX_TLBI_RANGE_PAGES pages.
 	 */
 	if ((!system_supports_tlb_range() &&
 	     (end - start) >= (MAX_DVM_OPS * stride)) ||
-	    pages >= MAX_TLBI_RANGE_PAGES) {
+	    pages > MAX_TLBI_RANGE_PAGES) {
 		flush_tlb_mm(vma->vm_mm);
 		return;
 	}
-- 
2.44.0