linux-kernel - Re: 2.6.37-rc1 build failure

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 10 Nov 2010 13:59:34 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	randrianasulu@...il.com, Lin Ming <lin@...g.vg>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.37-rc1 build failure

On Wed, 2010-11-03 at 21:34 -0700, Randy Dunlap wrote:
> The build fails for me with the given .config file.
> It's due to selects and depends, finally comes down to HAVE_PERF_EVENTS not being
> enabled for M386 or M486.  Do you actually have a processor of that vintage?

FWIW this .config generates a _TON_ of Kconfig dep warnings..

Urgh, Kconfig hell.

config PERF_EVENTS
        bool "Kernel performance events and counters"
        default y if (PROFILING || PERF_COUNTERS)
        depends on HAVE_PERF_EVENTS
        select ANON_INODES
        select IRQ_WORK


# grep PERF_EVENTS borken-build/.config
CONFIG_PERF_EVENTS=y
CONFIG_HAVE_PERF_EVENTS_NMI=y



So we managed to get PERF_EVENTS=y even though its dependency
HAVE_PERF_EVENTS=n.


I bet that's because of:

config X86
        select HAVE_PERF_EVENTS if (!M386 && !M486)
        select PERF_EVENTS 


Ingo, should we simply do something like the below patch?

---
Subject: x86: Remove M[34]86 conditional on HAVE_PERF_EVENTS

x86 requires PERF_EVENTS because of the hardware breakpoint mess,
so don't make it conditional on M[34]86.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 arch/x86/Kconfig |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index e832768..e330da2 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -21,7 +21,7 @@ config X86
 	select HAVE_UNSTABLE_SCHED_CLOCK
 	select HAVE_IDE
 	select HAVE_OPROFILE
-	select HAVE_PERF_EVENTS if (!M386 && !M486)
+	select HAVE_PERF_EVENTS
 	select HAVE_IRQ_WORK
 	select HAVE_IOREMAP_PROT
 	select HAVE_KPROBES

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/