linux-kernel - [PATCH 01/15] mm: add setup_initial_init

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Date:   Sat, 29 May 2021 18:54:50 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        <linux-kernel@...r.kernel.org>
CC:     Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH 01/15] mm: add setup_initial_init_mm() helper

Add setup_initial_init_mm() helper to setup kernel text,
data and brk.

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 include/linux/mm_types.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 38a516ec7d98..ae4c2e95c80a 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -564,6 +564,16 @@ struct mm_struct {
 };
 
 extern struct mm_struct init_mm;
+static inline void setup_initial_init_mm(char *start_code,
+					 char *end_code,
+					 char *end_data,
+					 char *brk)
+{
+	init_mm.start_code = (unsigned long)start_code;
+	init_mm.end_code = (unsigned long)end_code;
+	init_mm.end_data = (unsigned long)end_data;
+	init_mm.brk = (unsigned long)brk;
+}
 
 /* Pointer magic because the dynamic array size confuses some compilers. */
 static inline void mm_init_cpumask(struct mm_struct *mm)
-- 
2.26.2