From: OGAWA Hirofumi Signed-off-by: OGAWA Hirofumi Signed-off-by: Andrew Morton --- mm/pdflush.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff -puN mm/pdflush.c~pdflush-use-time_after-instead-of-open-coding-it mm/pdflush.c --- a/mm/pdflush.c~pdflush-use-time_after-instead-of-open-coding-it +++ a/mm/pdflush.c @@ -130,7 +130,7 @@ static int __pdflush(struct pdflush_work * Thread creation: For how long have there been zero * available threads? */ - if (jiffies - last_empty_jifs > 1 * HZ) { + if (time_after(jiffies, last_empty_jifs + 1 * HZ)) { /* unlocked list_empty() test is OK here */ if (list_empty(&pdflush_list)) { /* unlocked test is OK here */ @@ -151,7 +151,7 @@ static int __pdflush(struct pdflush_work if (nr_pdflush_threads <= MIN_PDFLUSH_THREADS) continue; pdf = list_entry(pdflush_list.prev, struct pdflush_work, list); - if (jiffies - pdf->when_i_went_to_sleep > 1 * HZ) { + if (time_after(jiffies, pdf->when_i_went_to_sleep + 1 * HZ)) { /* Limit exit rate */ pdf->when_i_went_to_sleep = jiffies; break; /* exeunt */ _