| From | Jiri Slaby <> | Subject | [PATCH 3.12 056/127] s390/hypfs: Use get_free_page() instead of kmalloc to ensure page alignment | Date | Fri, 25 Nov 2016 09:29:29 +0100 |
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From: Michael Holzheu <holzheu@linux.vnet.ibm.com>
3.12-stable review patch. If anyone has any objections, please let me know.
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commit 237d6e6884136923b6bd26d5141ebe1d065960c9 upstream.
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.
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Jiri Slaby <jslaby@suse.cz> --- arch/s390/hypfs/hypfs_diag.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/s390/hypfs/hypfs_diag.c b/arch/s390/hypfs/hypfs_diag.c index 5eeffeefae06..d73124df5d32 100644 --- a/arch/s390/hypfs/hypfs_diag.c +++ b/arch/s390/hypfs/hypfs_diag.c @@ -517,11 +517,11 @@ static int diag224(void *ptr) 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); @@ -530,7 +530,7 @@ 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) -- 2.10.2
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