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x86/mm/dump_pagetables: Generalize address normalization 

Modify normalize_addr to handle different sizes of virtual address
space.

It's preparation for enabling 5-level paging.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20170716225954.74185-2-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill A. Shutemov 2017-07-17 01:59:47 +03:00 committed by Ingo Molnar
parent 693bf0aa01
commit 3a366f791d
1 changed files with 6 additions and 5 deletions
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9
arch/x86/mm/dump_pagetables.c
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@ -188,11 +188,12 @@ static void printk_prot(struct seq_file *m, pgprot_t prot, int level, bool dmsg)
*/
static unsigned long normalize_addr(unsigned long u)
{
#ifdef CONFIG_X86_64
return (signed long)(u << 16) >> 16;
#else
int shift;
if (!IS_ENABLED(CONFIG_X86_64))
return u;
#endif
shift = 64 - (__VIRTUAL_MASK_SHIFT + 1);
return (signed long)(u << shift) >> shift;
}
/*