From 4595ef88d136134a9470c955575640f5c96344ed Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Tue, 26 Jul 2016 15:26:29 -0700 Subject: shmem: make shmem_inode_info::lock irq-safe We are going to need to call shmem_charge() under tree_lock to get accoutning right on collapse of small tmpfs pages into a huge one. The problem is that tree_lock is irq-safe and lockdep is not happy, that we take irq-unsafe lock under irq-safe[1]. Let's convert the lock to irq-safe. [1] https://gist.github.com/kiryl/80c0149e03ed35dfaf26628b8e03cdbc Link: http://lkml.kernel.org/r/1466021202-61880-34-git-send-email-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- ipc/shm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'ipc/shm.c') diff --git a/ipc/shm.c b/ipc/shm.c index 7fa5cbebbf19..dbac8860c721 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -766,10 +766,10 @@ static void shm_add_rss_swap(struct shmid_kernel *shp, } else { #ifdef CONFIG_SHMEM struct shmem_inode_info *info = SHMEM_I(inode); - spin_lock(&info->lock); + spin_lock_irq(&info->lock); *rss_add += inode->i_mapping->nrpages; *swp_add += info->swapped; - spin_unlock(&info->lock); + spin_unlock_irq(&info->lock); #else *rss_add += inode->i_mapping->nrpages; #endif -- cgit v1.2.3