Hi Lianbo, Ankur,
> This change covers more scenarios and looks good to me. Could you please update this patch? Ankur and Kazu.
I've updated, does this work well?
--
>From 9d6fca4d951f8bbb8c83078339e092da2d2fb0e0 Mon Sep 17 00:00:00 2001
From: Kazuhito Hagio <k-hagio-ab@xxxxxxx>
Date: Thu, 11 Nov 2021 15:20:52 +0900
Subject: [PATCH] arm64: Update SECTION_SIZE_BITS for kernels >= 5.12
Update the default SECTION_SIZE_BITS value for arm64 Linux 5.12
and later kernels that contain kernel commit f0b13ee23241
("arm64/sparsemem: reduce SECTION_SIZE_BITS").
Reported-by: Ankur Bansal <er.ankurbansal@xxxxxxxxx>
Signed-off-by: Kazuhito Hagio <k-hagio-ab@xxxxxxx>
---
arm64.c | 8 +++++++-
defs.h | 4 +++-
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/arm64.c b/arm64.c
index 3dcbcc642fda..94681d1a37db 100644
--- a/arm64.c
+++ b/arm64.c
@@ -1116,7 +1116,13 @@ arm64_get_section_size_bits(void)
int ret;
char *string;
- machdep->section_size_bits = _SECTION_SIZE_BITS;
+ if (THIS_KERNEL_VERSION >= LINUX(5,12,0)) {
+ if (machdep->pagesize == 65536)
+ machdep->section_size_bits = _SECTION_SIZE_BITS_5_12_64K;
+ else
+ machdep->section_size_bits = _SECTION_SIZE_BITS_5_12;
+ } else
+ machdep->section_size_bits = _SECTION_SIZE_BITS;
if ((string = pc->read_vmcoreinfo("NUMBER(SECTION_SIZE_BITS)"))) {
machdep->section_size_bits = atol(string);
diff --git a/defs.h b/defs.h
index 971005596506..a2f30853a4b1 100644
--- a/defs.h
+++ b/defs.h
@@ -3261,7 +3261,9 @@ typedef signed int s32;
#define ARM64_STACK_SIZE (16384)
#define ARM64_IRQ_STACK_SIZE ARM64_STACK_SIZE
-#define _SECTION_SIZE_BITS 30
+#define _SECTION_SIZE_BITS 30
+#define _SECTION_SIZE_BITS_5_12 27
+#define _SECTION_SIZE_BITS_5_12_64K 29
#define _MAX_PHYSMEM_BITS 40
#define _MAX_PHYSMEM_BITS_3_17 48
#define _MAX_PHYSMEM_BITS_52 52
--
2.27.0
--
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