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Subject[PATCH CPA] [1/28] Shrink __PAGE_KERNEL/__PAGE_KERNEL_EXEC on non PAE kernels
Date

No need to make it 64bit there.

Signed-off-by: Andi Kleen <ak@suse.de>

---
arch/x86/mm/init_32.c | 4 ++--
include/asm-x86/pgtable_32.h | 3 ++-
2 files changed, 4 insertions(+), 3 deletions(-)

Index: linux/arch/x86/mm/init_32.c
===================================================================
--- linux.orig/arch/x86/mm/init_32.c
+++ linux/arch/x86/mm/init_32.c
@@ -326,9 +326,9 @@ static void __init set_highmem_pages_ini
#define set_highmem_pages_init(bad_ppro) do { } while (0)
#endif /* CONFIG_HIGHMEM */

-unsigned long long __PAGE_KERNEL = _PAGE_KERNEL;
+typeof_field(pgprot_t, pgprot) __PAGE_KERNEL = _PAGE_KERNEL;
EXPORT_SYMBOL(__PAGE_KERNEL);
-unsigned long long __PAGE_KERNEL_EXEC = _PAGE_KERNEL_EXEC;
+typeof_field(pgprot_t, pgprot) __PAGE_KERNEL_EXEC = _PAGE_KERNEL_EXEC;

#ifdef CONFIG_NUMA
extern void __init remap_numa_kva(void);
Index: linux/include/asm-x86/pgtable_32.h
===================================================================
--- linux.orig/include/asm-x86/pgtable_32.h
+++ linux/include/asm-x86/pgtable_32.h
@@ -153,7 +153,8 @@ void paging_init(void);
#define _PAGE_KERNEL_EXEC \
(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)

-extern unsigned long long __PAGE_KERNEL, __PAGE_KERNEL_EXEC;
+#define typeof_field(t, m) typeof(((t *)0)->m)
+extern typeof_field(pgprot_t, pgprot) __PAGE_KERNEL, __PAGE_KERNEL_EXEC;
#define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
#define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
#define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)

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