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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2016-04-29 23:25:33 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2016-05-01 18:32:25 +1000
commite7bfc462d32fc417d3fea8ad07b62b59f000e925 (patch)
tree0edee82e64f61f039995204b669dcf581341b178 /arch
parent7e1e63c5e9d694c1198d410a6c7b2d0fa06da355 (diff)
downloadlinux-e7bfc462d32fc417d3fea8ad07b62b59f000e925.tar.gz
powerpc/mm: Use pte_user() instead of open coding
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/include/asm/book3s/64/pgtable.h5
-rw-r--r--arch/powerpc/perf/callchain.c2
2 files changed, 6 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 77d3ce05798e..60e84260a07d 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -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
diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c
index e04a6752b399..0071de76d776 100644
--- a/arch/powerpc/perf/callchain.c
+++ b/arch/powerpc/perf/callchain.c
@@ -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))