linux-kernel - Re: [tip:x86/mm] x86: Convert the rest of the code to support p4d

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Date:   Tue, 25 Apr 2017 03:57:02 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>, dvlasenk@...hat.com,
        Ingo Molnar <mingo@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>, brgerst@...il.com,
        Arnd Bergmann <arnd@...db.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Michal Hocko <mhocko@...e.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Borislav Petkov <bp@...en8.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/mm] x86: Convert the rest of the code to support p4d_t

On Mon, Apr 24, 2017 at 11:42:34AM -0700, Dan Williams wrote:
> >
> > I cannot reproduce the issue.
> >
> > Could you share your kernel kernel config?
> 
> Kernel config available here:
> https://gist.github.com/djbw/2b99a014396cca9f4406586573be98c0

Patch below should help. Please check.

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index a242139df8fe..745e5e183169 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -962,7 +962,7 @@ remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end,
 			continue;
 		}
 
-		pmd_base = (pmd_t *)pud_page_vaddr(*pud);
+		pmd_base = pmd_offset(pud, 0);
 		remove_pmd_table(pmd_base, addr, next, direct);
 		free_pmd_table(pmd_base, pud);
 	}
@@ -988,7 +988,7 @@ remove_p4d_table(p4d_t *p4d_start, unsigned long addr, unsigned long end,
 
 		BUILD_BUG_ON(p4d_large(*p4d));
 
-		pud_base = (pud_t *)p4d_page_vaddr(*p4d);
+		pud_base = pud_offset(p4d, 0);
 		remove_pud_table(pud_base, addr, next, direct);
 		free_pud_table(pud_base, p4d);
 	}
@@ -1013,7 +1013,7 @@ remove_pagetable(unsigned long start, unsigned long end, bool direct)
 		if (!pgd_present(*pgd))
 			continue;
 
-		p4d = (p4d_t *)pgd_page_vaddr(*pgd);
+		p4d = p4d_offset(pgd, 0);
 		remove_p4d_table(p4d, addr, next, direct);
 	}
 
-- 
 Kirill A. Shutemov