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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2017-02-24 09:43:51 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2017-02-24 10:43:38 +0300
commitfb94a687d96c570d46332a4a890f1dcb7310e643 (patch)
tree3f6eeda4463d114764f726b48949728a355b862d /arch/s390
parent2793784307688a7a72bd322727a2cb11dede875f (diff)
downloadlinux-fb94a687d96c570d46332a4a890f1dcb7310e643.tar.xz
s390: TASK_SIZE for kernel threads
Return a sensible value if TASK_SIZE if called from a kernel thread. This gets us around an issue with copy_mount_options that does a magic size calculation "TASK_SIZE - (unsigned long)data" while in a kernel thread and data pointing to kernel space. Cc: <stable@vger.kernel.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/include/asm/processor.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index c57c5c2f2484..e4988710aa86 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -91,7 +91,8 @@ extern void execve_tail(void);
* User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
*/
-#define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
+#define TASK_SIZE_OF(tsk) ((tsk)->mm ? \
+ (tsk)->mm->context.asce_limit : TASK_MAX_SIZE)
#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
(1UL << 30) : (1UL << 41))
#define TASK_SIZE TASK_SIZE_OF(current)