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powerpc/mm: Use pte_user() instead of open coding

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We have a common declaration in pte-common.h Add a book3s specific one
and switch to pte_user() in callchain.c. In a subsequent patch we will
switch _PAGE_USER to _PAGE_PRIVILEGED in the book3s version only.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2016-04-29 23:25:33 +10:00 committed by Michael Ellerman
parent 7e1e63c5e9
commit e7bfc462d3
2 changed files with 6 additions and 1 deletions
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5
arch/powerpc/include/asm/book3s/64/pgtable.h
View File

@ -185,6 +185,11 @@ extern struct page *pgd_page(pgd_t pgd);
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) & ~_PAGE_PTE })
#define __swp_entry_to_pte(x) __pte((x).val | _PAGE_PTE)
static inline bool pte_user(pte_t pte)
{
return !!(pte_val(pte) & _PAGE_USER);
}
#ifdef CONFIG_MEM_SOFT_DIRTY
#define _PAGE_SWP_SOFT_DIRTY (1UL << (SWP_TYPE_BITS + _PAGE_BIT_SWAP_TYPE))
#else

2
arch/powerpc/perf/callchain.c
View File

@ -137,7 +137,7 @@ static int read_user_stack_slow(void __user *ptr, void *buf, int nb)
offset = addr & ((1UL << shift) - 1);
pte = READ_ONCE(*ptep);
if (!pte_present(pte) || !(pte_val(pte) & _PAGE_USER))
if (!pte_present(pte) || !pte_user(pte))
goto err_out;
pfn = pte_pfn(pte);
if (!page_is_ram(pfn))