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cfe1957704
Open-coded page table entry checks don't work correctly when we fold the
page table level at runtime.
pgd_present() on 4-level paging machine always returns true, but
open-coded version of the check may return false-negative result and
we silently skip the rest of the loop body in efi_call_phys_epilog().
Replace open-coded checks with proper helpers.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org # v4.12+
Fixes:
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.. | ||
atom | ||
ce4100 | ||
efi | ||
geode | ||
goldfish | ||
intel | ||
intel-mid | ||
intel-quark | ||
iris | ||
olpc | ||
scx200 | ||
sfi | ||
ts5500 | ||
uv | ||
Makefile |