struct dentry{}->d_time is used when CONFIG_NFS_FS or
CONFIG_VBOXSF_FS is on.
Limit the d_time only when either of configs CONFIG_NFS_FS or
CONFIG_VBOXSF_FS is enabled
With this change size of "struct dentry" is reduced by 8-bytes
on 64-bit system, while of 32-bit system size remains unchanged
dentry object is vastly used, so this change should be useful
for memory savingSigned-off-by: Anupam Aggarwal <[email protected]> Signed-off-by: Vivek Trivedi <[email protected]> Signed-off-by: Amit Sahrawat <[email protected]> --- include/linux/dcache.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/dcache.h b/include/linux/dcache.h index a94c551..d90da5e 100644 --- a/include/linux/dcache.h +++ b/include/linux/dcache.h @@ -101,7 +101,9 @@ struct dentry { struct lockref d_lockref; /* per-dentry lock and refcount */ const struct dentry_operations *d_op; struct super_block *d_sb; /* The root of the dentry tree */ +#if IS_ENABLED(CONFIG_NFS_FS) || IS_ENABLED(CONFIG_VBOXSF_FS) unsigned long d_time; /* used by d_revalidate */ +#endif void *d_fsdata; /* fs-specific data */ union { -- 1.9.1
