linux-kernel - [PATCH v3 resend 01/15] mm: add setup_initial_init

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Date:   Tue, 8 Jun 2021 16:34:04 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        <linux-kernel@...r.kernel.org>
CC:     <linux-mm@...ck.org>, Kefeng Wang <wangkefeng.wang@...wei.com>,
        <linux-snps-arc@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-csky@...r.kernel.org>,
        <uclinux-h8-devel@...ts.sourceforge.jp>,
        <linux-m68k@...ts.linux-m68k.org>, <openrisc@...ts.librecores.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-riscv@...ts.infradead.org>,
        <linux-sh@...r.kernel.org>, <linux-s390@...r.kernel.org>,
        <x86@...nel.org>
Subject: [PATCH v3 resend 01/15] mm: add setup_initial_init_mm() helper

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

Cc: linux-snps-arc@...ts.infradead.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-csky@...r.kernel.org
Cc: uclinux-h8-devel@...ts.sourceforge.jp
Cc: linux-m68k@...ts.linux-m68k.org
Cc: openrisc@...ts.librecores.org
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: linux-riscv@...ts.infradead.org
Cc: linux-sh@...r.kernel.org
Cc: linux-s390@...r.kernel.org
Cc: x86@...nel.org
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 include/linux/mm.h | 3 +++
 mm/init-mm.c       | 9 +++++++++
 2 files changed, 12 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index c274f75efcf9..02aa057540b7 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -244,6 +244,9 @@ int __add_to_page_cache_locked(struct page *page, struct address_space *mapping,
 
 #define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
 
+void setup_initial_init_mm(void *start_code, void *end_code,
+			   void *end_data, void *brk);
+
 /*
  * Linux kernel virtual memory manager primitives.
  * The idea being to have a "virtual" mm in the same way
diff --git a/mm/init-mm.c b/mm/init-mm.c
index 153162669f80..b4a6f38fb51d 100644
--- a/mm/init-mm.c
+++ b/mm/init-mm.c
@@ -40,3 +40,12 @@ struct mm_struct init_mm = {
 	.cpu_bitmap	= CPU_BITS_NONE,
 	INIT_MM_CONTEXT(init_mm)
 };
+
+void setup_initial_init_mm(void *start_code, void *end_code,
+			   void *end_data, void *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;
+}
-- 
2.26.2