The patch titled
Subject: mm/early_ioremap.c: improve the execution efficiency of early_ioremap_setup()
has been added to the -mm mm-unstable branch. Its filename is
mm-improve-the-execution-efficiency-of-early_ioremap_setup.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-improve-the-execution-efficiency-of-early_ioremap_setup.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Liam Ni <zhiguangni01@xxxxxxxxx>
Subject: mm/early_ioremap.c: improve the execution efficiency of early_ioremap_setup()
Date: Sat, 3 Jun 2023 10:31:16 +0800
Reduce the number of invalid loops of the function early_ioremap_setup()
to improve the efficiency of function execution
Link: https://lkml.kernel.org/r/CACZJ9cU6t5sLoDwE6_XOg+UJLpZt4+qHfjYN2bA0s+3y9y6pQQ@xxxxxxxxxxxxxx
Signed-off-by: LiamNi <zhiguangni01@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/early_ioremap.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
--- a/mm/early_ioremap.c~mm-improve-the-execution-efficiency-of-early_ioremap_setup
+++ a/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)
_
Patches currently in -mm which might be from zhiguangni01@xxxxxxxxx are
mm-improve-the-execution-efficiency-of-early_ioremap_setup.patch
