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| author | Michael Holzheu <holzheu@linux.vnet.ibm.com> | 2016-10-25 16:24:28 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-10-28 10:08:58 +0200 |
| commit | 237d6e6884136923b6bd26d5141ebe1d065960c9 (patch) | |
| tree | a2c705310b6f4a6f0e92457ae4a9e82f4510c77d | |
| parent | 14970f204b1993af7459d5bd34aaff38dfee6670 (diff) | |
| download | lwn-237d6e6884136923b6bd26d5141ebe1d065960c9.tar.gz lwn-237d6e6884136923b6bd26d5141ebe1d065960c9.zip | |
s390/hypfs: Use get_free_page() instead of kmalloc to ensure page alignment
Since commit d86bd1bece6f ("mm/slub: support left redzone") it is no longer
guaranteed that kmalloc(PAGE_SIZE) returns page aligned memory.
After the above commit we get an error for diag224 because aligned
memory is required. This leads to the following user visible error:
# mount none -t s390_hypfs /sys/hypervisor/
mount: unknown filesystem type 's390_hypfs'
# dmesg | grep hypfs
hypfs.cccfb8: The hardware system does not provide all functions
required by hypfs
hypfs.7a79f0: Initialization of hypfs failed with rc=-61
Fix this problem and use get_free_page() instead of kmalloc() to get
correctly aligned memory.
Cc: stable@vger.kernel.org # v3.6+
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| -rw-r--r-- | arch/s390/hypfs/hypfs_diag.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/s390/hypfs/hypfs_diag.c b/arch/s390/hypfs/hypfs_diag.c index 28f03ca60100..794bebb43d23 100644 --- a/arch/s390/hypfs/hypfs_diag.c +++ b/arch/s390/hypfs/hypfs_diag.c @@ -363,11 +363,11 @@ out: static int diag224_get_name_table(void) { /* memory must be below 2GB */ - diag224_cpu_names = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA); + diag224_cpu_names = (char *) __get_free_page(GFP_KERNEL | GFP_DMA); if (!diag224_cpu_names) return -ENOMEM; if (diag224(diag224_cpu_names)) { - kfree(diag224_cpu_names); + free_page((unsigned long) diag224_cpu_names); return -EOPNOTSUPP; } EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16); @@ -376,7 +376,7 @@ static int diag224_get_name_table(void) static void diag224_delete_name_table(void) { - kfree(diag224_cpu_names); + free_page((unsigned long) diag224_cpu_names); } static int diag224_idx2name(int index, char *name) |