lkml.org 
[lkml]   [2013]   [Jan]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH] x86/perf_events: Fix "section type conflict" build error.
From: Jan Beulich <JBeulich@suse.com>

This patch fixes a build regression first introduced in 3.7 with
(e09df47 "perf/x86: Update/fix generic events on P6 PMU").

At least some older versions of gcc, like (GCC) 4.1.2 20080704 (Red Hat
4.1.2-51), dislike mixing constant and non-const data in the same
section. Without this patch a build will fail with the following error:

CC arch/x86/kernel/cpu/perf_event_p6.o
arch/x86/kernel/cpu/perf_event_p6.c:22: error: p6_hw_cache_event_ids causes a section type conflict
make[3]: *** [arch/x86/kernel/cpu/perf_event_p6.o] Error 1

Newer versions of gcc simply emits the section as writable (which isn't what
we want, but also is not a big problem as it gets discarded post-init anyway).

Also get the Knight's Corner definitions in sync.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: stable@kernel.org # 3.7.x only
[sruffell@digium.com: Added details to the commit message.]
Signed-off-by: Shaun Ruffell <sruffell@digium.com>

---

Hans, Thomas,

Any chance of picking this up for 3.8? This doesn't seem too
controversial since it only makes sure that data in the __initconst
section is const.

Rob Landley also reported this to the list here:
https://lkml.org/lkml/2012/12/14/511.

Thanks,
Shaun

arch/x86/kernel/cpu/perf_event_knc.c | 4 ++--
arch/x86/kernel/cpu/perf_event_p6.c | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event_knc.c b/arch/x86/kernel/cpu/perf_event_knc.c
index 4b7731b..838fa87 100644
--- a/arch/x86/kernel/cpu/perf_event_knc.c
+++ b/arch/x86/kernel/cpu/perf_event_knc.c
@@ -17,7 +17,7 @@ static const u64 knc_perfmon_event_map[] =
[PERF_COUNT_HW_BRANCH_MISSES] = 0x002b,
};

-static __initconst u64 knc_hw_cache_event_ids
+static const u64 __initconst knc_hw_cache_event_ids
[PERF_COUNT_HW_CACHE_MAX]
[PERF_COUNT_HW_CACHE_OP_MAX]
[PERF_COUNT_HW_CACHE_RESULT_MAX] =
@@ -284,7 +284,7 @@ static struct attribute *intel_knc_formats_attr[] = {
NULL,
};

-static __initconst struct x86_pmu knc_pmu = {
+static const struct x86_pmu knc_pmu __initconst = {
.name = "knc",
.handle_irq = knc_pmu_handle_irq,
.disable_all = knc_pmu_disable_all,
diff --git a/arch/x86/kernel/cpu/perf_event_p6.c b/arch/x86/kernel/cpu/perf_event_p6.c
index f2af39f..b1e2fe1 100644
--- a/arch/x86/kernel/cpu/perf_event_p6.c
+++ b/arch/x86/kernel/cpu/perf_event_p6.c
@@ -19,7 +19,7 @@ static const u64 p6_perfmon_event_map[] =

};

-static __initconst u64 p6_hw_cache_event_ids
+static const u64 __initconst p6_hw_cache_event_ids
[PERF_COUNT_HW_CACHE_MAX]
[PERF_COUNT_HW_CACHE_OP_MAX]
[PERF_COUNT_HW_CACHE_RESULT_MAX] =
--
1.8.1

\
 
 \ /
  Last update: 2013-01-09 19:01    [W:0.079 / U:1.164 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site