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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2018-02-14 14:16:53 +0300
committerIngo Molnar <mingo@kernel.org>2018-02-14 15:11:14 +0300
commitc65e774fb3f6af212641538694b9778ff9ab4300 (patch)
tree3c4da88dd0658874ea3fc7de3cc96ee27d711ef9 /arch/x86/include/asm/pgtable_32.h
parent5c7919bb1994f8dc7fed219a5db09e6bb9d473a5 (diff)
downloadlinux-c65e774fb3f6af212641538694b9778ff9ab4300.tar.xz
x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D variable
For boot-time switching between 4- and 5-level paging we need to be able to fold p4d page table level at runtime. It requires variable PGDIR_SHIFT and PTRS_PER_P4D. The change doesn't affect the kernel image size much: text data bss dec hex filename 8628091 4734304 1368064 14730459 e0c4db vmlinux.before 8628393 4734340 1368064 14730797 e0c62d vmlinux.after Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@suse.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/20180214111656.88514-7-kirill.shutemov@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/pgtable_32.h')
-rw-r--r--arch/x86/include/asm/pgtable_32.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pgtable_32.h b/arch/x86/include/asm/pgtable_32.h
index e67c0620aec2..d829360e26bd 100644
--- a/arch/x86/include/asm/pgtable_32.h
+++ b/arch/x86/include/asm/pgtable_32.h
@@ -33,6 +33,8 @@ static inline void pgtable_cache_init(void) { }
static inline void check_pgt_cache(void) { }
void paging_init(void);
+static inline int pgd_large(pgd_t pgd) { return 0; }
+
/*
* Define this if things work differently on an i386 and an i486:
* it will (on an i486) warn about kernel memory accesses that are