* [folded] procfs-mark-thread-stack-correctly-in-proc-pid-maps-fix-task_nommu-build-regression-in-linux-next.patch removed from -mm tree
@ 2012-03-21 23:20 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2012-03-21 23:20 UTC (permalink / raw)
To: siddhesh.poyarekar, msalter, oleg, paul.gortmaker, mm-commits
The patch titled
Subject: mm: Fix task_nommu build regression in linux-next
has been removed from the -mm tree. Its filename was
procfs-mark-thread-stack-correctly-in-proc-pid-maps-fix-task_nommu-build-regression-in-linux-next.patch
This patch was dropped because it was folded into procfs-mark-thread-stack-correctly-in-proc-pid-maps.patch
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
From: Siddhesh Poyarekar <siddhesh.poyarekar@gmail.com>
Subject: mm: Fix task_nommu build regression in linux-next
Commit b7b2a0afacada237005068294cb0ccc49d32889e resulted in a build
failure for nommu builds:
fs/built-in.o: In function `nommu_vma_show':
task_nommu.c:(.text+0x564a0): undefined reference to `vm_is_stack'
make[1]: *** [.tmp_vmlinux1] Error 1
Fix is to provide definitions of vm_is_stack() and
vm_is_stack_for_task() for nommu as well. This patch also adds an
explicit include of sched.h based on observations and patch submission
by Paul Gortmaker <paul.gortmaker@windriver.com>:
https://lkml.org/lkml/2012/3/5/326
Signed-off-by: Siddhesh Poyarekar <siddhesh.poyarekar@gmail.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/memory.c | 1 +
mm/nommu.c | 40 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 41 insertions(+)
diff -puN mm/memory.c~procfs-mark-thread-stack-correctly-in-proc-pid-maps-fix-task_nommu-build-regression-in-linux-next mm/memory.c
--- a/mm/memory.c~procfs-mark-thread-stack-correctly-in-proc-pid-maps-fix-task_nommu-build-regression-in-linux-next
+++ a/mm/memory.c
@@ -57,6 +57,7 @@
#include <linux/swapops.h>
#include <linux/elf.h>
#include <linux/gfp.h>
+#include <linux/sched.h>
#include <asm/io.h>
#include <asm/pgalloc.h>
diff -puN mm/nommu.c~procfs-mark-thread-stack-correctly-in-proc-pid-maps-fix-task_nommu-build-regression-in-linux-next mm/nommu.c
--- a/mm/nommu.c~procfs-mark-thread-stack-correctly-in-proc-pid-maps-fix-task_nommu-build-regression-in-linux-next
+++ a/mm/nommu.c
@@ -29,6 +29,7 @@
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/audit.h>
+#include <linux/sched.h>
#include <asm/uaccess.h>
#include <asm/tlb.h>
@@ -2094,3 +2095,42 @@ int nommu_shrink_inode_mappings(struct i
up_write(&nommu_region_sem);
return 0;
}
+
+/* Check if the vma is being used as a stack by this task */
+static int vm_is_stack_for_task(struct task_struct *t,
+ struct vm_area_struct *vma)
+{
+ return (vma->vm_start <= KSTK_ESP(t) && vma->vm_end >= KSTK_ESP(t));
+}
+
+/*
+ * Check if the vma is being used as a stack.
+ * If is_group is non-zero, check in the entire thread group or else
+ * just check in the current task. Returns the pid of the task that
+ * the vma is stack for.
+ */
+pid_t vm_is_stack(struct task_struct *task,
+ struct vm_area_struct *vma, int in_group)
+{
+ pid_t ret = 0;
+
+ if (vm_is_stack_for_task(task, vma))
+ return task->pid;
+
+ if (in_group) {
+ struct task_struct *t;
+ rcu_read_lock();
+ t = list_first_entry_rcu(&task->thread_group,
+ struct task_struct, thread_group);
+ do {
+ if (vm_is_stack_for_task(t, vma)) {
+ ret = t->pid;
+ goto done;
+ }
+ } while_each_thread(task, t);
+done:
+ rcu_read_unlock();
+ }
+
+ return ret;
+}
_
Patches currently in -mm which might be from siddhesh.poyarekar@gmail.com are
procfs-mark-thread-stack-correctly-in-proc-pid-maps.patch
procfs-mark-thread-stack-correctly-in-proc-pid-maps-v3.patch
procfs-mark-thread-stack-correctly-in-proc-pid-maps-v3-checkpatch-fixes.patch
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2012-03-21 23:20 [folded] procfs-mark-thread-stack-correctly-in-proc-pid-maps-fix-task_nommu-build-regression-in-linux-next.patch removed from -mm tree akpm
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