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Re: 2.6.27-rc1-mm1: unable to boot with gcov on x86_64

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From: Mariusz Kozlowski <m.kozlowski@...>
To: Peter Oberparleiter <peter.oberparleiter@...>
Cc: Andrew Morton <akpm@...>, <linux-kernel@...>, <kernel-testers@...>
Subject: Re: 2.6.27-rc1-mm1: unable to boot with gcov on x86_64
Date: Tuesday, August 5, 2008 - 4:26 pm

Hello Peter,

	I'm seeing similar GCOV problems as with 2.6.26-rc5-mm1 that you fixed.
This is the same x86_64 box and again it was unable to boot with gcov enabled.
A quick look revealed that arch/x86/tsc_64.c and arch/x86/tsc_32.c code was
unified. Unfortunately simple change of

GCOV_tsc_32.o := n
GCOV_tsc_64.o := n

to

GCOV_tsc.o := n

did not help. Given the amount of combinations of which set of files with GCOV
might cause failures I was rather fortunate and after a few hours I was able
to pinpoint exactly two files which need GCOV disabled to make my x86_64 boot.

If you want to try to figure out what is wrong with them please feel free to send
me patches to test. If not then how about this patch? Compile and run tested.

Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl>

--- linux-2.6.27-rc1-mm1/arch/x86/kernel/Makefile	2008-08-01 18:05:04.000000000 +0200
+++ linux-2.6.27-rc1-mm1-dirty/arch/x86/kernel/Makefile	2008-08-05 21:49:21.000000000 +0200
@@ -13,8 +13,8 @@ CFLAGS_REMOVE_rtc.o = -pg
 CFLAGS_REMOVE_paravirt.o = -pg
 endif
 
-GCOV_tsc_32.o := n
-GCOV_tsc_64.o := n
+GCOV_vsyscall_64.o := n
+GCOV_tsc.o := n
 
 #
 # vsyscalls (which work on the user stack) should have


	Mariusz
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Messages in current thread:
2.6.27-rc1-mm1, Andrew Morton, (Thu Jul 31, 3:03 am)
Re: 2.6.27-rc1-mm1: unable to boot with gcov on x86_64, Mariusz Kozlowski, (Tue Aug 5, 4:26 pm)
Re: 2.6.27-rc1-mm1: unable to boot with gcov on x86_64, Peter Oberparleiter, (Wed Aug 6, 3:23 am)
Re: 2.6.27-rc1-mm1: unable to boot with gcov on x86_64, Mariusz Kozlowski, (Tue Aug 5, 4:29 pm)
Re: 2.6.27-rc1-mm1: sparc64 BUG: using smp_processor_id() in..., Mariusz Kozlowski, (Sat Aug 2, 11:17 am)
Re: 2.6.27-rc1-mm1: sparc64 BUG: using smp_processor_id() in..., David Miller, (Sun Aug 3, 3:02 am)
Re: 2.6.27-rc1-mm1: rmmod ide-cd_mod oops, Mariusz Kozlowski, (Sat Aug 2, 5:23 am)
Re: 2.6.27-rc1-mm1: rmmod ide-cd_mod oops, Bartlomiej Zolnierkiewicz..., (Sat Aug 2, 12:15 pm)
Re: 2.6.27-rc1-mm1: rmmod ide-cd_mod oops, Mariusz Kozlowski, (Sat Aug 2, 7:25 pm)
Re: 2.6.27-rc1-mm1: rmmod ide-cd_mod oops, Bartlomiej Zolnierkiewicz..., (Sun Aug 3, 10:41 am)
Re: 2.6.27-rc1-mm1: rmmod ide-cd_mod oops, Mariusz Kozlowski, (Sun Aug 3, 11:45 am)
[BUILD-FAILURE] 2.6.27-rc1-mm1 - allyesconfig build fails on..., Kamalesh Babulal, (Thu Jul 31, 8:43 am)
Re: [BUILD-FAILURE] 2.6.27-rc1-mm1 - allyesconfig build fail..., Tony Breeds, (Fri Aug 1, 1:29 am)
Re: [BUILD-FAILURE] 2.6.27-rc1-mm1 - allyesconfig build fail..., Kamalesh Babulal, (Fri Aug 1, 12:16 pm)
Re: [BUILD-FAILURE] 2.6.27-rc1-mm1 - allyesconfig build fail..., Peter 1 Oberparleiter, (Fri Aug 1, 11:44 am)
Re: [BUILD-FAILURE] 2.6.27-rc1-mm1 - allyesconfig build fail..., Andrew Morton, (Fri Aug 1, 2:12 am)
Re: [BUILD-FAILURE] 2.6.27-rc1-mm1 - allyesconfig build fail..., Sam Ravnborg, (Fri Aug 1, 12:45 pm)
Re: [BUILD-FAILURE] 2.6.27-rc1-mm1 - allyesconfig build fail..., Peter 1 Oberparleiter, (Fri Aug 1, 11:40 am)
2.6.27-rc1-mm1: busyloop time-schedule, Alexey Dobriyan, (Thu Jul 31, 8:23 am)
Re: 2.6.27-rc1-mm1, Balbir Singh, (Thu Jul 31, 4:10 am)