The patch titled
Subject: mm/debug: replace __pa() with __pa_symbol() in debug_vm_pgtable()
has been added to the -mm tree. Its filename is
mm-debug-add-tests-validating-architecture-page-table-helpers-fix-2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-debug-add-tests-validating-architecture-page-table-helpers-fix-2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-debug-add-tests-validating-architecture-page-table-helpers-fix-2.patch
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: mm/debug: replace __pa() with __pa_symbol() in debug_vm_pgtable()
Replace __pa() with __pa_symbol() in debug_vm_pgtable() while accessing
the physical address for 'start_kernel' which is a kernel text symbol,
else it might trigger the following warning on some platforms when
DEBUG_VIRTUAL is enabled.
[ 23.123852] ------------[ cut here ]------------
[ 23.124486] virt_to_phys used for non-linear address: (____ptrval____) (start_kernel+0x0/0x424)
[ 23.125663] WARNING: CPU: 11 PID: 1 at arch/arm64/mm/physaddr.c:15 __virt_to_phys+0x60/0x98
[ 23.126877] Modules linked in:
[ 23.127390] CPU: 11 PID: 1 Comm: swapper/0 Tainted: G W 5.6.0-rc3-next-20200226-00001-g306225cc6ffd #163
[ 23.129139] Hardware name: linux,dummy-virt (DT)
[ 23.129898] pstate: 60400005 (nZCv daif +PAN -UAO)
[ 23.130693] pc : __virt_to_phys+0x60/0x98
[ 23.131359] lr : __virt_to_phys+0x60/0x98
[ 23.132022] sp : ffff800011e6be10
[ 23.132575] x29: ffff800011e6be10 x28: 0000000000000000
[ 23.133447] x27: 0000000000000000 x26: 0000000000000000
[ 23.134319] x25: 0000000000000000 x24: 0020000000000fd3
[ 23.135197] x23: fffffe000bd27700 x22: ffff0002fcae8000
[ 23.136069] x21: ffff800011a47000 x20: 0000000000000001
[ 23.136941] x19: ffff800011350a14 x18: 0000000000000010
[ 23.137815] x17: 000000006bb8910e x16: 00000000a1fdc699
[ 23.138693] x15: ffffffffffffffff x14: 6c656e72656b5f74
[ 23.139567] x13: 726174732820295f x12: 5f5f5f6c61767274
[ 23.140441] x11: 705f5f5f5f28203a x10: 7373657264646120
[ 23.141314] x9 : 7261656e696c2d6e x8 : ffff8000106b4e70
[ 23.142189] x7 : 00000000000002a1 x6 : ffff800011a58bba
[ 23.143067] x5 : 001fffffffffffff x4 : 0000000000000000
[ 23.143939] x3 : 00000000ffffffff x2 : ffff800011881bf8
[ 23.144810] x1 : 16ee3f9cb03efc00 x0 : 0000000000000000
[ 23.145682] Call trace:
[ 23.146097] __virt_to_phys+0x60/0x98
[ 23.146710] debug_vm_pgtable+0xd0/0x440
[ 23.147362] kernel_init+0x18/0x100
[ 23.147944] ret_from_fork+0x10/0x18
[ 23.148539] ---[ end trace fc4ccb3cb35ff225 ]---
Link: http://lkml.kernel.org/r/1582776031-30344-1-git-send-email-anshuman.khandual@xxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Reported-by: Qian Cai <cai@xxxxxx>
Cc: James Morse <james.morse@xxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/debug_vm_pgtable.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/debug_vm_pgtable.c~mm-debug-add-tests-validating-architecture-page-table-helpers-fix-2
+++ a/mm/debug_vm_pgtable.c
@@ -331,7 +331,7 @@ void __init debug_vm_pgtable(void)
* helps avoid large memory block allocations to be used for mapping
* at higher page table levels.
*/
- paddr = __pa(&start_kernel);
+ paddr = __pa_symbol(&start_kernel);
pte_aligned = (paddr & PAGE_MASK) >> PAGE_SHIFT;
pmd_aligned = (paddr & PMD_MASK) >> PAGE_SHIFT;
_
Patches currently in -mm which might be from anshuman.khandual@xxxxxxx are
mm-debug-add-tests-validating-architecture-page-table-helpers.patch
mm-debug-add-tests-validating-architecture-page-table-helpers-fix-2.patch
mm-vma-add-missing-vma-flag-readable-name-for-vm_sync.patch
mm-vma-make-vma_is_accessible-available-for-general-use.patch
mm-vma-replace-all-remaining-open-encodings-with-is_vm_hugetlb_page.patch
mm-vma-replace-all-remaining-open-encodings-with-vma_is_anonymous.patch
mm-vma-append-unlikely-while-testing-vma-access-permissions.patch
