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author | Ingo Molnar <mingo@kernel.org> | 2019-11-29 08:17:25 +0100 |
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committer | Ingo Molnar <mingo@kernel.org> | 2019-12-10 10:12:55 +0100 |
commit | 186525bd6b83efc592672e2d6185e4d7c810d2b4 (patch) | |
tree | 0fd5cb176e8e113a552730ea07dedbb8359e652b /arch/x86/include/asm/pgtable_areas.h | |
parent | 1f059dfdf5d170dccbac92193be2fee3c1763384 (diff) | |
download | linux-stable-186525bd6b83efc592672e2d6185e4d7c810d2b4.tar.gz linux-stable-186525bd6b83efc592672e2d6185e4d7c810d2b4.tar.bz2 linux-stable-186525bd6b83efc592672e2d6185e4d7c810d2b4.zip |
mm, x86/mm: Untangle address space layout definitions from basic pgtable type definitions
- Untangle the somewhat incestous way of how VMALLOC_START is used all across the
kernel, but is, on x86, defined deep inside one of the lowest level page table headers.
It doesn't help that vmalloc.h only includes a single asm header:
#include <asm/page.h> /* pgprot_t */
So there was no existing cross-arch way to decouple address layout
definitions from page.h details. I used this:
#ifndef VMALLOC_START
# include <asm/vmalloc.h>
#endif
This way every architecture that wants to simplify page.h can do so.
- Also on x86 we had a couple of LDT related inline functions that used
the late-stage address space layout positions - but these could be
uninlined without real trouble - the end result is cleaner this way as
well.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/pgtable_areas.h')
-rw-r--r-- | arch/x86/include/asm/pgtable_areas.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pgtable_areas.h b/arch/x86/include/asm/pgtable_areas.h new file mode 100644 index 000000000000..d34cce1b995c --- /dev/null +++ b/arch/x86/include/asm/pgtable_areas.h @@ -0,0 +1,16 @@ +#ifndef _ASM_X86_PGTABLE_AREAS_H +#define _ASM_X86_PGTABLE_AREAS_H + +#ifdef CONFIG_X86_32 +# include <asm/pgtable_32_areas.h> +#endif + +/* Single page reserved for the readonly IDT mapping: */ +#define CPU_ENTRY_AREA_RO_IDT CPU_ENTRY_AREA_BASE +#define CPU_ENTRY_AREA_PER_CPU (CPU_ENTRY_AREA_RO_IDT + PAGE_SIZE) + +#define CPU_ENTRY_AREA_RO_IDT_VADDR ((void *)CPU_ENTRY_AREA_RO_IDT) + +#define CPU_ENTRY_AREA_MAP_SIZE (CPU_ENTRY_AREA_PER_CPU + CPU_ENTRY_AREA_ARRAY_SIZE - CPU_ENTRY_AREA_BASE) + +#endif /* _ASM_X86_PGTABLE_AREAS_H */ |