Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1600325 > unrolled thread

[PATCH 3.12 51/60] s390: TASK_SIZE for kernel threads

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  [PATCH 3.12 51/60] s390: TASK_SIZE for kernel threads Jiri Slaby <jslaby@suse.cz> - 2017-03-14 14:20 +0100

#1600325 — [PATCH 3.12 51/60] s390: TASK_SIZE for kernel threads

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit fb94a687d96c570d46332a4a890f1dcb7310e643 upstream.

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.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 arch/s390/include/asm/processor.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index ca7821f07260..a42a05322d25 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -48,7 +48,8 @@ extern void execve_tail(void);
 
 #else /* CONFIG_64BIT */
 
-#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)
-- 
2.12.0

[toc] | [standalone]

Back to top | Article view | linux.kernel

csiph-web