linux-kernel - Re: -tip: origin tree build failure

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Message-ID: <20091218114501.GA17561@basil.fritz.box>
Date:	Fri, 18 Dec 2009 12:45:01 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Mackall <mpm@...enic.com>, Nick Piggin <npiggin@...e.de>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: -tip: origin tree build failure

> No, your patch is not the correct fix. As i said, PROC_PAGE_MONITOR provides 
> the facility and mm/memory-failure.c uses that facility - and your patch does 
> not solve that fundamental dependency issue, it just fudges around the 
> dependencies.

Thanks for the report.

The filter is really part of the injector, even if it happens to be 
in the other file. I first resisted adding an ifdef to it, but it seems
we need it. I think I forgot to set to set CONFIG_EMBEDDED earlier,
that is what made the earlier build test pass even when it shouldn't have.

This updated patch should fix it. I tried to build test all applicable
combinations, if anything is still missing please let me know.

-Andi

---

HWPOISON: Add PROC_FS dependency to hwpoison injector v2

The injector filter requires stable_page_flags() which is supplied
by procfs. So make it dependent on that.

Also add ifdefs around the filter code in memory-failure.c so that
when the filter is disabled due to missing dependencies the whole
code still builds. 

Reported-by: Ingo Molnar 
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 mm/Kconfig          |    2 +-
 mm/memory-failure.c |    9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

Index: linux/mm/Kconfig
===================================================================
--- linux.orig/mm/Kconfig
+++ linux/mm/Kconfig
@@ -252,7 +252,7 @@ config MEMORY_FAILURE
 
 config HWPOISON_INJECT
 	tristate "HWPoison pages injector"
-	depends on MEMORY_FAILURE && DEBUG_KERNEL
+	depends on MEMORY_FAILURE && DEBUG_KERNEL && PROC_FS
 	select PROC_PAGE_MONITOR
 
 config NOMMU_INITIAL_TRIM_EXCESS
Index: linux/mm/memory-failure.c
===================================================================
--- linux.orig/mm/memory-failure.c
+++ linux/mm/memory-failure.c
@@ -52,6 +52,8 @@ int sysctl_memory_failure_recovery __rea
 
 atomic_long_t mce_bad_pages __read_mostly = ATOMIC_LONG_INIT(0);
 
+#if defined(CONFIG_HWPOISON_INJECT) || defined(CONFIG_HWPOISON_INJECT_MODULE)
+
 u32 hwpoison_filter_enable = 0;
 u32 hwpoison_filter_dev_major = ~0U;
 u32 hwpoison_filter_dev_minor = ~0U;
@@ -164,6 +166,13 @@ int hwpoison_filter(struct page *p)
 
 	return 0;
 }
+#else
+int hwpoison_filter(struct page *p)
+{
+	return 0;
+}
+#endif
+
 EXPORT_SYMBOL_GPL(hwpoison_filter);
 
 /*
--
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