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Message-Id: <20180516080131.27913-4-kirill.shutemov@linux.intel.com>
Date: Wed, 16 May 2018 11:01:30 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
Cc: Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 3/4] x86/boot/compressed/64: Fix trampoline page table address calculation
Hugh noticied that I calculate address of trampoline page table wrong in
cleanup_trampoline(). TRAMPOLINE_32BIT_PGTABLE_OFFSET has to be divided
by sizeof(unsigned long) since trampoline_32bit is unsigned long
pointer.
TRAMPOLINE_32BIT_PGTABLE_OFFSET is zero so the bug doesn't have a
visible effect.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Reported-by: Hugh Dickins <hughd@...gle.com>
Fixes: e9d0e6330eb8 ("x86/boot/compressed/64: Prepare new top-level page table for trampoline")
---
arch/x86/boot/compressed/pgtable_64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/boot/compressed/pgtable_64.c b/arch/x86/boot/compressed/pgtable_64.c
index a362fa0b849c..23707e1da1ff 100644
--- a/arch/x86/boot/compressed/pgtable_64.c
+++ b/arch/x86/boot/compressed/pgtable_64.c
@@ -130,7 +130,7 @@ void cleanup_trampoline(void *pgtable)
{
void *trampoline_pgtable;
- trampoline_pgtable = trampoline_32bit + TRAMPOLINE_32BIT_PGTABLE_OFFSET;
+ trampoline_pgtable = trampoline_32bit + TRAMPOLINE_32BIT_PGTABLE_OFFSET / sizeof(unsigned long);
/*
* Move the top level page table out of trampoline memory,
--
2.17.0
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