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staging: lustre: fix unstable pages tracking

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A patch to change to page accounting code (in v4.8-rc1) conflicts with
a change to lustre (in staging-next for v4.9), and fortunately gets
detected using a gcc warning:

In file included from /git/arm-soc/include/linux/mm.h:1001:0,
                 from /git/arm-soc/include/linux/highmem.h:7,
                 from /git/arm-soc/drivers/staging/lustre/lustre/osc/../../include/linux/libcfs/linux/libcfs.h:46,
                 from /git/arm-soc/drivers/staging/lustre/lustre/osc/../../include/linux/libcfs/libcfs.h:36,
                 from /git/arm-soc/drivers/staging/lustre/lustre/osc/osc_cl_internal.h:45,
                 from /git/arm-soc/drivers/staging/lustre/lustre/osc/osc_page.c:40:
drivers/staging/lustre/lustre/osc/osc_page.c: In function 'unstable_page_accounting':
include/linux/vmstat.h:117:2: error: array subscript is above array bounds [-Werror=array-bounds]
  atomic_long_add(x, &vm_zone_stat[item]);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/vmstat.h:117:2: error: array subscript is above array bounds [-Werror=array-bounds]
  atomic_long_add(x, &vm_zone_stat[item]);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This changes the function to use the correct interface for accounting in the
"node" rather than the "zone".

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: d806f30e63 ("staging: lustre: osc: revise unstable pages accounting")
Fixes: 11fb998986 ("mm: move most file-based accounting to the node")
Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann 2016-08-29 14:20:00 +02:00 committed by Greg Kroah-Hartman
parent bbc2d82f1c
commit 7894c263f2
1 changed files with 7 additions and 7 deletions
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14
drivers/staging/lustre/lustre/osc/osc_page.c
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@ -789,7 +789,7 @@ out:
/**
* Atomic operations are expensive. We accumulate the accounting for the
* same page zone to get better performance.
* same page pgdat to get better performance.
* In practice this can work pretty good because the pages in the same RPC
* are likely from the same page zone.
*/
@ -797,28 +797,28 @@ static inline void unstable_page_accounting(struct ptlrpc_bulk_desc *desc,
int factor)
{
int page_count = desc->bd_iov_count;
void *zone = NULL;
pg_data_t *last = NULL;
int count = 0;
int i;
for (i = 0; i < page_count; i++) {
void *pz = page_zone(desc->bd_iov[i].bv_page);
pg_data_t *pgdat = page_pgdat(desc->bd_iov[i].bv_page);
if (likely(pz == zone)) {
if (likely(pgdat == last)) {
++count;
continue;
}
if (count > 0) {
mod_zone_page_state(zone, NR_UNSTABLE_NFS,
mod_node_page_state(pgdat, NR_UNSTABLE_NFS,
factor * count);
count = 0;
}
zone = pz;
last = pgdat;
++count;
}
if (count > 0)
mod_zone_page_state(zone, NR_UNSTABLE_NFS, factor * count);
mod_node_page_state(last, NR_UNSTABLE_NFS, factor * count);
}
static inline void add_unstable_page_accounting(struct ptlrpc_bulk_desc *desc)