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Tue, 17 Aug 2021 15:47:53 +0000 From: Liam Howlett To: "maple-tree@lists.infradead.org" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , Andrew Morton CC: Song Liu , Davidlohr Bueso , "Paul E . McKenney" , Matthew Wilcox , Laurent Dufour , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Vlastimil Babka , Rik van Riel , Peter Zijlstra , Michel Lespinasse , Liam Howlett Subject: [PATCH v2 33/61] fs/binfmt_elf: Use maple tree iterators for fill_files_note() Thread-Topic: [PATCH v2 33/61] fs/binfmt_elf: Use maple tree iterators for fill_files_note() Thread-Index: AQHXk38r+bIWnCuiAk2dn4LmhHXjbA== Date: Tue, 17 Aug 2021 15:47:22 +0000 Message-ID: <20210817154651.1570984-34-Liam.Howlett@oracle.com> References: <20210817154651.1570984-1-Liam.Howlett@oracle.com> In-Reply-To: <20210817154651.1570984-1-Liam.Howlett@oracle.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.30.2 authentication-results: lists.infradead.org; dkim=none (message not signed) header.d=none;lists.infradead.org; dmarc=none action=none header.from=oracle.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 8ecb19ea-ad27-4522-420d-08d961965fdc x-ms-traffictypediagnostic: DM6PR10MB4236: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:3044; 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Howlett" Signed-off-by: Liam R. Howlett --- fs/binfmt_elf.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index 439ed81e755a..4a13324aaba1 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -1614,6 +1614,7 @@ static int fill_files_note(struct memelfnote *note) user_long_t *data; user_long_t *start_end_ofs; char *name_base, *name_curpos; + MA_STATE(mas, &mm->mm_mt, 0, 0); =20 /* *Estimated* file count and total data size needed */ count =3D mm->map_count; @@ -1638,7 +1639,8 @@ static int fill_files_note(struct memelfnote *note) name_base =3D name_curpos =3D ((char *)data) + names_ofs; remaining =3D size - names_ofs; count =3D 0; - for (vma =3D mm->mmap; vma !=3D NULL; vma =3D vma->vm_next) { + rcu_read_lock(); + mas_for_each(&mas, vma, ULONG_MAX) { struct file *file; const char *filename; =20 @@ -1667,6 +1669,7 @@ static int fill_files_note(struct memelfnote *note) *start_end_ofs++ =3D vma->vm_pgoff; count++; } + rcu_read_unlock(); =20 /* Now we know exact count of files, can store it */ data[0] =3D count; --=20 2.30.2