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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2016-06-28 13:05:04 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-06-28 13:11:55 +0200
commit25d539c9a958faf092bc1b8736ebc30b49faeebc (patch)
treeb56aa7b78c4294816ee39d26991c9359fa6bd1c3
parentc3bdf2e11a10ea804d69a6d1ba1e8a061efb0fa8 (diff)
downloadlinux-25d539c9a958faf092bc1b8736ebc30b49faeebc.tar.bz2
s390/ptrace: clarify bits in the per_struct
The bits single_step and instruction_fetch lost their meaning with git commit 5e9a26928f550157 "[S390] ptrace cleanup". Clarify the comment for these two bits. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/include/uapi/asm/ptrace.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/s390/include/uapi/asm/ptrace.h b/arch/s390/include/uapi/asm/ptrace.h
index a150f4fabe43..77630c74f13b 100644
--- a/arch/s390/include/uapi/asm/ptrace.h
+++ b/arch/s390/include/uapi/asm/ptrace.h
@@ -359,9 +359,9 @@ typedef struct
per_cr_bits bits;
} control_regs;
/*
- * Use these flags instead of setting em_instruction_fetch
- * directly they are used so that single stepping can be
- * switched on & off while not affecting other tracing
+ * The single_step and instruction_fetch bits are obsolete,
+ * the kernel always sets them to zero. To enable single
+ * stepping use ptrace(PTRACE_SINGLESTEP) instead.
*/
unsigned single_step : 1;
unsigned instruction_fetch : 1;