netdev - [PATCH v2 23/34] uprobes: convert put_page() to put_user

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Message-Id: <20190804224915.28669-24-jhubbard@nvidia.com>
Date:   Sun,  4 Aug 2019 15:49:04 -0700
From:   john.hubbard@...il.com
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jérôme Glisse <jglisse@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx@...ts.freedesktop.org, ceph-devel@...r.kernel.org,
        devel@...verdev.osuosl.org, devel@...ts.orangefs.org,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-fbdev@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-mm@...ck.org,
        linux-nfs@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org, linux-xfs@...r.kernel.org,
        netdev@...r.kernel.org, rds-devel@....oracle.com,
        sparclinux@...r.kernel.org, x86@...nel.org,
        xen-devel@...ts.xenproject.org, John Hubbard <jhubbard@...dia.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH v2 23/34] uprobes: convert put_page() to put_user_page*()

From: John Hubbard <jhubbard@...dia.com>

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@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: John Hubbard <jhubbard@...dia.com>
---
 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