Re: [PATCH] tmpfs: depend on shmem

[Matt Mackall]

On Tue, 2009-09-08 at 21:25 +0100, Hugh Dickins wrote:
> CONFIG_SHMEM off gives you (ramfs masquerading as) tmpfs, even when
> CONFIG_TMPFS is off: that's a little anomalous, and I'd intended to
> make more sense of it by removing CONFIG_TMPFS altogether, always
> enabling its code when CONFIG_SHMEM; but so many defconfigs have
> CONFIG_SHMEM on CONFIG_TMPFS off that we'd better leave that as is.
> 
> But there is no point in asking for CONFIG_TMPFS if CONFIG_SHMEM is
> off: make TMPFS depend on SHMEM, which also prevents TMPFS_POSIX_ACL
> shmem_acl.o being pointlessly built into the kernel when SHMEM is off.

Fair enough.

> And a selfish change, to prevent the world from being rebuilt when I
> switch between CONFIG_SHMEM on and off: the only CONFIG_SHMEM in the
> header files is mm.h shmem_lock() - give that a shmem.c stub instead.

Might as well, on the principle of one less ifdef.

> Signed-off-by: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx>

Acked-by: Matt Mackall <mpm@xxxxxxxxxxx>

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