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| author | David Hildenbrand <david@redhat.com> | 2022-12-05 20:37:13 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-12-12 03:12:20 +0100 |
| commit | a0ac9b3598fac36907bd1baec28c99656d2ed0b6 (patch) | |
| tree | d49bd9497d53cb82b5711873795225693964c61e | |
| parent | mm,thp,rmap: fix races between updates of subpages_mapcount (diff) | |
| download | linux-a0ac9b3598fac36907bd1baec28c99656d2ed0b6.tar.xz linux-a0ac9b3598fac36907bd1baec28c99656d2ed0b6.zip | |
mm/gup_test: fix PIN_LONGTERM_TEST_READ with highmem
Patch series "selftests/vm: fix some tests on 32bit".
I finally had the time to run some of the selftests written by me
(especially "cow") on x86 PAE. I found some unexpected "surprises" :)
With these changes, and with [1] on top of mm-unstable, the "cow" tests
and the "ksm_functional_tests" compile and pass as expected (expected
failures with hugetlb in the "cow" tests). "madv_populate" has one
expected test failure -- x86 does not support softdirty tracking.
#1-#3 fix commits with stable commit ids. #4 fixes a test that is not in
mm-stable yet.
A note that there are many other compile errors/warnings when compiling on
32bit and with older Linux headers ... something for another day.
[1] https://lkml.kernel.org/r/20221205150857.167583-1-david@redhat.com
This patch (of 4):
... we have to kmap()/kunmap(), otherwise this won't work as expected
with highmem.
Link: https://lkml.kernel.org/r/20221205193716.276024-1-david@redhat.com
Link: https://lkml.kernel.org/r/20221205193716.276024-2-david@redhat.com
Fixes: c77369b437f9 ("mm/gup_test: start/stop/read functionality for PIN LONGTERM test")
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>,
Cc: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | mm/gup_test.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/mm/gup_test.c b/mm/gup_test.c index 0d76d9b4bb5a..33f431e0da60 100644 --- a/mm/gup_test.c +++ b/mm/gup_test.c @@ -4,6 +4,7 @@ #include <linux/uaccess.h> #include <linux/ktime.h> #include <linux/debugfs.h> +#include <linux/highmem.h> #include "gup_test.h" static void put_back_pages(unsigned int cmd, struct page **pages, @@ -297,10 +298,13 @@ static inline int pin_longterm_test_read(unsigned long arg) return -EFAULT; for (i = 0; i < pin_longterm_test_nr_pages; i++) { - void *addr = page_to_virt(pin_longterm_test_pages[i]); + void *addr = kmap_local_page(pin_longterm_test_pages[i]); + unsigned long ret; - if (copy_to_user((void __user *)(unsigned long)user_addr, addr, - PAGE_SIZE)) + ret = copy_to_user((void __user *)(unsigned long)user_addr, addr, + PAGE_SIZE); + kunmap_local(addr); + if (ret) return -EFAULT; user_addr += PAGE_SIZE; } |