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s390/ptrace: clarify bits in the per_struct

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The bits single_step and instruction_fetch lost their meaning
with git commit 5e9a26928f "[S390] ptrace cleanup".
Clarify the comment for these two bits.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2016-06-28 13:05:04 +02:00
parent c3bdf2e11a
commit 25d539c9a9
1 changed files with 3 additions and 3 deletions
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6
arch/s390/include/uapi/asm/ptrace.h
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@ -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;