linux-kernel - [PATCH] mm:Improve the execution efficiency of early_ioremap

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Message-ID: <CACZJ9cU6t5sLoDwE6_XOg+UJLpZt4+qHfjYN2bA0s+3y9y6pQQ@mail.gmail.com>
Date:   Sat, 3 Jun 2023 10:31:16 +0800
From:   Liam Ni <zhiguangni01@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm:Improve the execution efficiency of early_ioremap_setup()

Reduce the number of invalid loops of the function early_ioremap_setup()
to improve the efficiency of function execution

Signed-off-by: LiamNi <zhiguangni01@...il.com>
---
 mm/early_ioremap.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/mm/early_ioremap.c b/mm/early_ioremap.c
index 9bc12e526ed0..ce06b2884789 100644
--- a/mm/early_ioremap.c
+++ b/mm/early_ioremap.c
@@ -72,12 +72,10 @@ void __init early_ioremap_setup(void)
 {
    int i;

-   for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
-       if (WARN_ON(prev_map[i]))
-           break;
-
-   for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
+   for (i = 0; i < FIX_BTMAPS_SLOTS; i++) {
+       WARN_ON_ONCE(prev_map[i]);
        slot_virt[i] = __fix_to_virt(FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*i);
+   }
 }

 static int __init check_early_ioremap_leak(void)
-- 
2.25.1