Reading macro value from generated/compile.h

Asked Apr 25 '17 at 10:01

Active Apr 27 '17 at 10:34

Viewed 203 times

I am trying to create a procfs entry. In linux kernel, I modify the scripts/mkcompile_h file to get timestamp value which is written to temperory generated file include/generated/compile.h. When I try to read that value (Eg: UTS_VERSION) from include/generated/compile.h (even /proc/version uses same logic to get details), I get some different value for time (some lesser seconds).

For printing macro value as proc entry, I just use seq_printf(m, MACRO_VALUE);. I dont understand the reason for not getting exact MACRO value as in proc/version. Even the KBUILD_BUILD_VERSION is wrong, it gives one less value than the macro value specified in include/generated/compile.h when I do seq_printf(m, UTS_VERSION);.

Sample generated/compile.h file:

#define UTS_MACHINE "arm"

#define UTS_VERSION "#2 SMP PREEMPT Day Month Date hh:mm:ss IST year"

Expected output: #2 SMP PREEMPT Day Month Date hh:mm:ss IST year

But I get following output: #1 SMP PREEMPT Day Month Date hh:mm:ss-somevalue IST year

edited Apr 27 '17 at 10:34

asked Apr 25 '17 at 10:01

Ivid

I'm totally lost. Care to rethink your question and put it clearly? – 0andriy Apr 26 '17 at 09:40
@0andriy I have updated the question. Could you please check? – Ivid Apr 26 '17 at 16:38
Elaborate how is defined `MACRO_VALUE` and `UTS_VERSION` in your case? Better to provide a code snippet. – 0andriy Apr 26 '17 at 18:40
@0andriy Updated. – Ivid Apr 27 '17 at 06:21
And if you use *seq_printf(m, "%s", UTS_VERSION)* instead does it work? – 0andriy Apr 27 '17 at 08:21
@0andriy No the value differs. – Ivid Apr 27 '17 at 09:29
You need to amend your question. Perhaps you need to add what is result, what is expected result with **real code snippets and examples**. – 0andriy Apr 27 '17 at 10:12

Reading macro value from generated/compile.h

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