linux-kernel - [PATCH] mm/pgtable: define pte_index so that preprocessor could recognize it

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Date:   Tue, 11 Jan 2022 16:54:57 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Christian Dietrich <stettberger@...ucode.de>,
        Mike Rapoport <rppt@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH] mm/pgtable: define pte_index so that preprocessor could recognize it

From: Mike Rapoport <rppt@...ux.ibm.com>

Since commit 974b9b2c68f3 ("mm: consolidate pte_index() and pte_offset_*()
definitions") pte_index is a static inline and there is no define for it
that can be recognized by the preprocessor. As the result,
vm_insert_pages() uses slower loop over vm_insert_page() instead of
insert_pages() that amortizes the cost of spinlock operations when
inserting multiple pages.

Fixes: 974b9b2c68f3 ("mm: consolidate pte_index() and pte_offset_*() definitions")
Reported-by: Christian Dietrich <stettberger@...ucode.de>
Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
Cc: stable@...r.kernel.org
---
 include/linux/pgtable.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index e24d2c992b11..d468efcf48f4 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -62,6 +62,7 @@ static inline unsigned long pte_index(unsigned long address)
 {
 	return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
 }
+#define pte_index pte_index
 
 #ifndef pmd_index
 static inline unsigned long pmd_index(unsigned long address)

base-commit: 2585cf9dfaaddf00b069673f27bb3f8530e2039c
-- 
2.28.0