+ sparse-define-__must_be_array-for-__checker__.patch added to -mm tree

+ sparse-define-__must_be_array-for-__checker__.patch added to -mm tree

[akpm]

The patch titled
     sparse: define __must_be_array() for __CHECKER__
has been added to the -mm tree.  Its filename is
     sparse-define-__must_be_array-for-__checker__.patch

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------------------------------------------------------
Subject: sparse: define __must_be_array() for __CHECKER__
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>

commit c5e631cf65f ("ARRAY_SIZE: check for type") added __must_be_array().
But sparse can't parse this gcc extention.

Now make C=2 makes following sparse errors a lot.

  kernel/futex.c:2699:25: error: No right hand side of '+'-expression

Because __must_be_array() is used for ARRAY_SIZE() macro and it is
used very widely.

This patch fixes it.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/compiler-gcc.h |    4 ++++
 1 file changed, 4 insertions(+)

diff -puN include/linux/compiler-gcc.h~sparse-define-__must_be_array-for-__checker__ include/linux/compiler-gcc.h
--- a/include/linux/compiler-gcc.h~sparse-define-__must_be_array-for-__checker__
+++ a/include/linux/compiler-gcc.h
@@ -34,8 +34,12 @@
     __asm__ ("" : "=r"(__ptr) : "0"(ptr));		\
     (typeof(ptr)) (__ptr + (off)); })
 
+#ifdef __CHECKER__
+#define __must_be_array(arr) 0
+#else
 /* &a[0] degrades to a pointer: a different type from an array */
 #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
+#endif
 
 /*
  * Force always-inline if the user requests it so via the .config,
_

Patches currently in -mm which might be from kosaki.motohiro@jp.fujitsu.com are

origin.patch
mm-per-node-vmstat-show-proper-vmstats.patch
mm-per-node-vmstat-show-proper-vmstats-fix.patch
mm-increase-reclaim_distance-to-30.patch
mm-introduce-wait_on_page_locked_killable.patch
x86mm-make-pagefault-killable.patch
mm-mem-hotplug-fix-section-mismatch-setup_per_zone_inactive_ratio-should-be-__meminit.patch
mm-mem-hotplug-recalculate-lowmem_reserve-when-memory-hotplug-occur.patch
mm-mem-hotplug-update-pcp-stat_threshold-when-memory-hotplug-occur.patch
mm-mem-hotplug-update-pcp-stat_threshold-when-memory-hotplug-occur-fix.patch
mm-convert-vma-vm_flags-to-64-bit.patch
mm-add-__nocast-attribute-to-vm_flags.patch
fremap-convert-vm_flags-to-unsigned-long-long.patch
procfs-convert-vm_flags-to-unsigned-long-long.patch
oom-replace-pf_oom_origin-with-toggling-oom_score_adj.patch
oom-replace-pf_oom_origin-with-toggling-oom_score_adj-update.patch
mm-batch-activate_page-to-reduce-lock-contention.patch
sparse-define-dummy-build_bug_on-definition-for-sparse.patch
sparse-define-__must_be_array-for-__checker__.patch
sparse-undef-__compiletime_warningerror-if-__checker__-is-defined.patch
mm-move-enum-vm_event_item-into-a-standalone-header-file.patch
memcg-count-the-soft_limit-reclaim-in-global-background-reclaim.patch
memcg-add-stats-to-monitor-soft_limit-reclaim.patch
add-the-pagefault-count-into-memcg-stats.patch
add-the-pagefault-count-into-memcg-stats-fix.patch
cpusets-randomize-node-rotor-used-in-cpuset_mem_spread_node.patch
kexec-remove-kmsg_dump_kexec.patch
kexec-remove-kmsg_dump_kexec-fix.patch