From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Hubbard Subject: [PATCH v2 18/18] mm/gup: remove support for gup(FOLL_LONGTERM) Date: Sun, 3 Nov 2019 13:18:13 -0800 Message-ID: <20191103211813.213227-19-jhubbard@nvidia.com> References: <20191103211813.213227-1-jhubbard@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <20191103211813.213227-1-jhubbard@nvidia.com> Sender: linux-kernel-owner@vger.kernel.org To: Andrew Morton Cc: Al Viro , Alex Williamson , Benjamin Herrenschmidt , =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , Christoph Hellwig , Dan Williams , Daniel Vetter , Dave Chinner , David Airlie , "David S . Miller" , Ira Weiny , Jan Kara , Jason Gunthorpe , Jens Axboe , Jonathan Corbet , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Magnus Karlsson , Mauro Carvalho Chehab , Michael Ellerman M List-Id: dri-devel@lists.freedesktop.org Now that all other kernel callers of get_user_pages(FOLL_LONGTERM) have been converted to pin_longterm_pages(), lock it down: 1) Add an assertion to get_user_pages(), preventing callers from passing FOLL_LONGTERM (in addition to the existing assertion that prevents FOLL_PIN). 2) Remove the associated GUP_LONGTERM_BENCHMARK test. Signed-off-by: John Hubbard --- mm/gup.c | 8 ++++---- mm/gup_benchmark.c | 9 +-------- tools/testing/selftests/vm/gup_benchmark.c | 7 ++----- 3 files changed, 7 insertions(+), 17 deletions(-) diff --git a/mm/gup.c b/mm/gup.c index c9727e65fad3..317f7602495d 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -1732,11 +1732,11 @@ long get_user_pages(unsigned long start, unsigned l= ong nr_pages, struct vm_area_struct **vmas) { /* - * FOLL_PIN must only be set internally by the pin_user_page*() and - * pin_longterm_*() APIs, never directly by the caller, so enforce that - * with an assertion: + * FOLL_PIN and FOLL_LONGTERM must only be set internally by the + * pin_user_page*() and pin_longterm_*() APIs, never directly by the + * caller, so enforce that with an assertion: */ - if (WARN_ON_ONCE(gup_flags & FOLL_PIN)) + if (WARN_ON_ONCE(gup_flags & (FOLL_PIN | FOLL_LONGTERM))) return -EINVAL; =20 return __gup_longterm_locked(current, current->mm, start, nr_pages, diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c index 2bb0f5df4803..de6941855b7e 100644 --- a/mm/gup_benchmark.c +++ b/mm/gup_benchmark.c @@ -6,7 +6,7 @@ #include =20 #define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_benchmark) -#define GUP_LONGTERM_BENCHMARK _IOWR('g', 2, struct gup_benchmark) +/* Command 2 has been deleted. */ #define GUP_BENCHMARK _IOWR('g', 3, struct gup_benchmark) #define PIN_FAST_BENCHMARK _IOWR('g', 4, struct gup_benchmark) #define PIN_LONGTERM_BENCHMARK _IOWR('g', 5, struct gup_benchmark) @@ -28,7 +28,6 @@ static void put_back_pages(int cmd, struct page **pages, = unsigned long nr_pages) =20 switch (cmd) { case GUP_FAST_BENCHMARK: - case GUP_LONGTERM_BENCHMARK: case GUP_BENCHMARK: for (i =3D 0; i < nr_pages; i++) put_page(pages[i]); @@ -94,11 +93,6 @@ static int __gup_benchmark_ioctl(unsigned int cmd, nr =3D get_user_pages_fast(addr, nr, gup->flags & 1, pages + i); break; - case GUP_LONGTERM_BENCHMARK: - nr =3D get_user_pages(addr, nr, - (gup->flags & 1) | FOLL_LONGTERM, - pages + i, NULL); - break; case GUP_BENCHMARK: nr =3D get_user_pages(addr, nr, gup->flags & 1, pages + i, NULL); @@ -157,7 +151,6 @@ static long gup_benchmark_ioctl(struct file *filep, uns= igned int cmd, =20 switch (cmd) { case GUP_FAST_BENCHMARK: - case GUP_LONGTERM_BENCHMARK: case GUP_BENCHMARK: case PIN_FAST_BENCHMARK: case PIN_LONGTERM_BENCHMARK: diff --git a/tools/testing/selftests/vm/gup_benchmark.c b/tools/testing/sel= ftests/vm/gup_benchmark.c index c5c934c0f402..5ef3cf8f3da5 100644 --- a/tools/testing/selftests/vm/gup_benchmark.c +++ b/tools/testing/selftests/vm/gup_benchmark.c @@ -15,7 +15,7 @@ #define PAGE_SIZE sysconf(_SC_PAGESIZE) =20 #define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_benchmark) -#define GUP_LONGTERM_BENCHMARK _IOWR('g', 2, struct gup_benchmark) +/* Command 2 has been deleted. */ #define GUP_BENCHMARK _IOWR('g', 3, struct gup_benchmark) =20 /* @@ -46,7 +46,7 @@ int main(int argc, char **argv) char *file =3D "/dev/zero"; char *p; =20 - while ((opt =3D getopt(argc, argv, "m:r:n:f:abctTLUuwSH")) !=3D -1) { + while ((opt =3D getopt(argc, argv, "m:r:n:f:abctTUuwSH")) !=3D -1) { switch (opt) { case 'a': cmd =3D PIN_FAST_BENCHMARK; @@ -72,9 +72,6 @@ int main(int argc, char **argv) case 'T': thp =3D 0; break; - case 'L': - cmd =3D GUP_LONGTERM_BENCHMARK; - break; case 'U': cmd =3D GUP_BENCHMARK; break; --=20 2.23.0