From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Tue, 10 May 2005 09:40:19 +0000 (+0100)
Subject: [PATCH] ARM: Add top_pmd, which points at the top-most page table
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c4e1f6f6bf82af89994a0ee760fc5e036c4d3c1f;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[PATCH] ARM: Add top_pmd, which points at the top-most page table

Signed-off-by: Russell King <rmk@arm.linux.org.uk>
---

diff --git a/arch/arm/mm/mm-armv.c b/arch/arm/mm/mm-armv.c
index 2a514b05cd5c..fa60fd65fcf8 100644
--- a/arch/arm/mm/mm-armv.c
+++ b/arch/arm/mm/mm-armv.c
@@ -37,6 +37,8 @@ pgprot_t pgprot_kernel;
 
 EXPORT_SYMBOL(pgprot_kernel);
 
+pmd_t *top_pmd;
+
 struct cachepolicy {
 	const char	policy[16];
 	unsigned int	cr_mask;
@@ -682,6 +684,8 @@ void __init memtable_init(struct meminfo *mi)
 
 	flush_cache_all();
 	flush_tlb_all();
+
+	top_pmd = pmd_off_k(VECTORS_HIGH);
 }
 
 /*
diff --git a/include/asm-arm/page.h b/include/asm-arm/page.h
index 4ca3a8e9348f..d26d1574d972 100644
--- a/include/asm-arm/page.h
+++ b/include/asm-arm/page.h
@@ -171,6 +171,9 @@ typedef unsigned long pgprot_t;
 
 #endif /* STRICT_MM_TYPECHECKS */
 
+/* the upper-most page table pointer */
+extern pmd_t *top_pmd;
+
 /* Pure 2^n version of get_order */
 static inline int get_order(unsigned long size)
 {