[Devel] [PATCH RHEL7 COMMIT] bc/mm/shmem.c: use mm_ub() macro to avoid compilation errors if !CONFIG_BEANCOUNTERS

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-123.1.2-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-123.1.2.vz7.4.10
------>
commit 5425b7be953d98968a1b23e613ca45210a6cc6ca
Author: Kir Kolyshkin <kir at openvz.org>
Date:   Thu May 7 20:28:14 2015 +0400

    bc/mm/shmem.c: use mm_ub() macro to avoid compilation errors if !CONFIG_BEANCOUNTERS
    
    This was found while tring to compile the kernel with a stock
    config (i.e. no CONFIG_BEANCOUNTERS, CONFIG_VE etc.) and
    boot it on IBM Power8.
    
    =============================================================
    
    Use mm_ub() macro to avoid this:
    
    mm/shmem.c: In function ‘tmpfs_ram_pages’:
    mm/shmem.c:122:18: error: ‘struct mm_struct’ has no member named ‘mm_ub’
      ub = current->mm->mm_ub;
                      ^
    
    mm/shmem.c: In function ‘shmem_zero_setup’:
    mm/shmem.c:3013:39: error: ‘struct mm_struct’ has no member named
    ‘mm_ub’
       uncharge_beancounter_fast(vma->vm_mm->mm_ub, UB_PRIVVMPAGES,
    
    Signed-off-by: Kir Kolyshkin <kir at openvz.org>
---
 mm/shmem.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index c01b3a2..a6b3e30 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -119,7 +119,7 @@ static unsigned long tmpfs_ram_pages(void)
 	if (unlikely(!current->mm))
 		goto out;
 
-	ub = current->mm->mm_ub;
+	ub = mm_ub(current->mm);
 	if (ub != get_ub0()) {
 		ub_rampages = ub->ub_parms[UB_PHYSPAGES].limit;
 		if (ub_rampages == UB_MAXVALUE)
@@ -3010,7 +3010,7 @@ int shmem_zero_setup(struct vm_area_struct *vma)
 	if (vma->vm_file)
 		fput(vma->vm_file);
 	else if (vma->vm_flags & VM_WRITE)
-		uncharge_beancounter_fast(vma->vm_mm->mm_ub, UB_PRIVVMPAGES,
+		uncharge_beancounter_fast(mm_ub(vma->vm_mm), UB_PRIVVMPAGES,
 					  size >> PAGE_SHIFT);
 	vma->vm_file = file;
 	vma->vm_ops = &shmem_vm_ops;