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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2016-10-25 16:24:28 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-10-28 10:08:58 +0200
commit237d6e6884136923b6bd26d5141ebe1d065960c9 (patch)
treea2c705310b6f4a6f0e92457ae4a9e82f4510c77d /arch/s390/hypfs/hypfs_diag.c
parentMerge branch 'akpm' (patches from Andrew) (diff)
downloadlinux-dev-237d6e6884136923b6bd26d5141ebe1d065960c9.tar.xz
linux-dev-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>
Diffstat (limited to 'arch/s390/hypfs/hypfs_diag.c')
-rw-r--r--arch/s390/hypfs/hypfs_diag.c6
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)