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| author |   Vasily Gorbik <gor@linux.ibm.com> | 2020-10-06 22:12:39 +0200 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2021-06-18 16:41:19 +0200 |
| commit | 0c4f2623b95779fe8cfb277fa255e4b91c0f96f0 (patch) | |
| tree | f7c6c12dc982a80e4ed7de67fdb829c0682f84ba /arch/s390/include/asm/pgtable.h | |
| parent | s390/entry.S: factor out OUTSIDE macro (diff) | |
| download | linux-dev-0c4f2623b95779fe8cfb277fa255e4b91c0f96f0.tar.xz linux-dev-0c4f2623b95779fe8cfb277fa255e4b91c0f96f0.zip | |
s390: setup kernel memory layout early
Currently there are two separate places where kernel memory layout has
to be known and adjusted:
1. early kasan setup.
2. paging setup later.
Those 2 places had to be kept in sync and adjusted to reflect peculiar
technical details of one another. With additional factors which influence
kernel memory layout like ultravisor secure storage limit, complexity
of keeping two things in sync grew up even more.
Besides that if we look forward towards creating identity mapping and
enabling DAT before jumping into uncompressed kernel - that would also
require full knowledge of and control over kernel memory layout.
So, de-duplicate and move kernel memory layout setup logic into
the decompressor.
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/pgtable.h')
| -rw-r--r-- | arch/s390/include/asm/pgtable.h | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 9512f6820ead..5677be473261 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -17,6 +17,7 @@ #include <linux/page-flags.h> #include <linux/radix-tree.h> #include <linux/atomic.h> +#include <asm/sections.h> #include <asm/bug.h> #include <asm/page.h> #include <asm/uv.h> @@ -86,16 +87,16 @@ extern unsigned long zero_page_mask; * happen without trampolines and in addition the placement within a * 2GB frame is branch prediction unit friendly. */ -extern unsigned long VMALLOC_START; -extern unsigned long VMALLOC_END; +extern unsigned long __bootdata_preserved(VMALLOC_START); +extern unsigned long __bootdata_preserved(VMALLOC_END); #define VMALLOC_DEFAULT_SIZE ((512UL << 30) - MODULES_LEN) -extern struct page *vmemmap; -extern unsigned long vmemmap_size; +extern struct page *__bootdata_preserved(vmemmap); +extern unsigned long __bootdata_preserved(vmemmap_size); #define VMEM_MAX_PHYS ((unsigned long) vmemmap) -extern unsigned long MODULES_VADDR; -extern unsigned long MODULES_END; +extern unsigned long __bootdata_preserved(MODULES_VADDR); +extern unsigned long __bootdata_preserved(MODULES_END); #define MODULES_VADDR MODULES_VADDR #define MODULES_END MODULES_END #define MODULES_LEN (1UL << 31) |