[PATCH 4.9 31/39] kaiser: drop is_atomic arg to kaiser_pagetable_walk()

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hugh Dickins <hu...@google.com>


I have not observed a might_sleep() warning from setup_fixmap_gdt()'s
use of kaiser_add_mapping() in our tree (why not?), but like upstream
we have not provided a way for that to pass is_atomic true down to
kaiser_pagetable_walk(), and at startup it's far from a likely source
of trouble: so just delete the walk's is_atomic arg and might_sleep().

Signed-off-by: Hugh Dickins <hu...@google.com>
Acked-by: Jiri Kosina <jkos...@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 arch/x86/mm/kaiser.c |   10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

--- a/arch/x86/mm/kaiser.c
+++ b/arch/x86/mm/kaiser.c
@@ -107,19 +107,13 @@ static inline unsigned long get_pa_from_
  *
  * Returns a pointer to a PTE on success, or NULL on failure.
  */
-static pte_t *kaiser_pagetable_walk(unsigned long address, bool is_atomic)
+static pte_t *kaiser_pagetable_walk(unsigned long address)
 {
        pmd_t *pmd;
        pud_t *pud;
        pgd_t *pgd = native_get_shadow_pgd(pgd_offset_k(address));
        gfp_t gfp = (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO);
 
-       if (is_atomic) {
-               gfp &= ~GFP_KERNEL;
-               gfp |= __GFP_HIGH | __GFP_ATOMIC;
-       } else
-               might_sleep();
-
        if (pgd_none(*pgd)) {
                WARN_ONCE(1, "All shadow pgds should have been populated");
                return NULL;
@@ -194,7 +188,7 @@ static int kaiser_add_user_map(const voi
                        ret = -EIO;
                        break;
                }
-               pte = kaiser_pagetable_walk(address, false);
+               pte = kaiser_pagetable_walk(address);
                if (!pte) {
                        ret = -ENOMEM;
                        break;