[Xen-devel] [PATCH v2 23/34] uprobes: convert put_page() to put_user_page*()

[john.hubbard@xxxxxxxxx]

From: John Hubbard <jhubbard@xxxxxxxxxx>

For pages that were retained via get_user_pages*(), release those pages
via the new put_user_page*() routines, instead of via put_page() or
release_pages().

This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
("mm: introduce put_user_page*(), placeholder versions").

Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
---
 kernel/events/uprobes.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 84fa00497c49..4a575de8cec8 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -397,7 +397,7 @@ __update_ref_ctr(struct mm_struct *mm, unsigned long vaddr, 
short d)
        ret = 0;
 out:
        kunmap_atomic(kaddr);
-       put_page(page);
+       put_user_page(page);
        return ret;
 }
 
@@ -504,7 +504,7 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe, struct 
mm_struct *mm,
        ret = __replace_page(vma, vaddr, old_page, new_page);
        put_page(new_page);
 put_old:
-       put_page(old_page);
+       put_user_page(old_page);
 
        if (unlikely(ret == -EAGAIN))
                goto retry;
@@ -1981,7 +1981,7 @@ static int is_trap_at_addr(struct mm_struct *mm, unsigned 
long vaddr)
                return result;
 
        copy_from_page(page, vaddr, &opcode, UPROBE_SWBP_INSN_SIZE);
-       put_page(page);
+       put_user_page(page);
  out:
        /* This needs to return true for any variant of the trap insn */
        return is_trap_insn(&opcode);
-- 
2.22.0


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