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arm64: Improve error reporting on set_pte_at() checks

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Currently the BUG_ON() checks do not give enough information about the
PTEs being set. This patch changes BUG_ON to WARN_ONCE and dumps the
values of the old and new PTEs. In addition, the checks are only made if
the new PTE entry is valid.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Ming Lei <tom.leiming@gmail.com>
Cc: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Catalin Marinas 2015-12-08 17:39:15 +00:00
parent 98fb754831
commit 82d340081b
1 changed files with 8 additions and 4 deletions
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12
arch/arm64/include/asm/pgtable.h
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@ -276,10 +276,14 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
* hardware updates of the pte (ptep_set_access_flags safely changes
* valid ptes without going through an invalid entry).
*/
if (IS_ENABLED(CONFIG_DEBUG_VM) && IS_ENABLED(CONFIG_ARM64_HW_AFDBM) &&
pte_valid(*ptep)) {
BUG_ON(!pte_young(pte));
BUG_ON(pte_write(*ptep) && !pte_dirty(pte));
if (IS_ENABLED(CONFIG_ARM64_HW_AFDBM) &&
pte_valid(*ptep) && pte_valid(pte)) {
VM_WARN_ONCE(!pte_young(pte),
"%s: racy access flag clearing: 0x%016llx -> 0x%016llx",
__func__, pte_val(*ptep), pte_val(pte));
VM_WARN_ONCE(pte_write(*ptep) && !pte_dirty(pte),
"%s: racy dirty state clearing: 0x%016llx -> 0x%016llx",
__func__, pte_val(*ptep), pte_val(pte));
}
set_pte(ptep, pte);