staging: remove ashmem

The mainline replacement for ashmem is memfd, so remove the legacy
code from drivers/staging/
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220315123457.2354812-1-hch@lst.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/Kconfig

@@ -58,8 +58,6 @@ source "drivers/staging/nvec/Kconfig"
 
 source "drivers/staging/media/Kconfig"
 
-source "drivers/staging/android/Kconfig"
-
 source "drivers/staging/board/Kconfig"
 
 source "drivers/staging/gdm724x/Kconfig"

drivers/staging/Makefile

@@ -19,7 +19,6 @@ obj-$(CONFIG_IIO)		+= iio/
 obj-$(CONFIG_FB_SM750)		+= sm750fb/
 obj-$(CONFIG_USB_EMXX)		+= emxx_udc/
 obj-$(CONFIG_MFD_NVEC)		+= nvec/
-obj-$(CONFIG_ANDROID)		+= android/
 obj-$(CONFIG_STAGING_BOARD)	+= board/
 obj-$(CONFIG_LTE_GDM724X)	+= gdm724x/
 obj-$(CONFIG_FIREWIRE_SERIAL)	+= fwserial/

drivers/staging/android/Kconfig

-# SPDX-License-Identifier: GPL-2.0
-menu "Android"
-
-if ANDROID
-
-config ASHMEM
-	bool "Enable the Anonymous Shared Memory Subsystem"
-	depends on SHMEM
-	help
-	  The ashmem subsystem is a new shared memory allocator, similar to
-	  POSIX SHM but with different behavior and sporting a simpler
-	  file-based API.
-
-	  It is, in theory, a good memory allocator for low-memory devices,
-	  because it can discard shared memory units when under memory pressure.
-
-endif # if ANDROID
-
-endmenu

drivers/staging/android/Makefile

-# SPDX-License-Identifier: GPL-2.0
-ccflags-y += -I$(src)			# needed for trace events
-
-obj-$(CONFIG_ASHMEM)			+= ashmem.o

drivers/staging/android/TODO

-TODO:
-	- sparse fixes
-	- rename files to be not so "generic"
-	- add proper arch dependencies as needed
-	- audit userspace interfaces to make sure they are sane
-
-Please send patches to Greg Kroah-Hartman <greg@kroah.com> and Cc:
-Arve Hjønnevåg <arve@android.com> and Riley Andrews <riandrews@android.com>

drivers/staging/android/ashmem.h

-/* SPDX-License-Identifier: GPL-2.0 OR Apache-2.0 */
-/*
- * include/linux/ashmem.h
- *
- * Copyright 2008 Google Inc.
- * Author: Robert Love
- */
-
-#ifndef _LINUX_ASHMEM_H
-#define _LINUX_ASHMEM_H
-
-#include <linux/limits.h>
-#include <linux/ioctl.h>
-#include <linux/compat.h>
-
-#include "uapi/ashmem.h"
-
-/* support of 32bit userspace on 64bit platforms */
-#ifdef CONFIG_COMPAT
-#define COMPAT_ASHMEM_SET_SIZE		_IOW(__ASHMEMIOC, 3, compat_size_t)
-#define COMPAT_ASHMEM_SET_PROT_MASK	_IOW(__ASHMEMIOC, 5, unsigned int)
-#endif
-
-#endif	/* _LINUX_ASHMEM_H */

drivers/staging/android/uapi/ashmem.h

-/* SPDX-License-Identifier: GPL-2.0 OR Apache-2.0 */
-/*
- * Copyright 2008 Google Inc.
- * Author: Robert Love
- */
-
-#ifndef _UAPI_LINUX_ASHMEM_H
-#define _UAPI_LINUX_ASHMEM_H
-
-#include <linux/ioctl.h>
-#include <linux/types.h>
-
-#define ASHMEM_NAME_LEN		256
-
-#define ASHMEM_NAME_DEF		"dev/ashmem"
-
-/* Return values from ASHMEM_PIN: Was the mapping purged while unpinned? */
-#define ASHMEM_NOT_PURGED	0
-#define ASHMEM_WAS_PURGED	1
-
-/* Return values from ASHMEM_GET_PIN_STATUS: Is the mapping pinned? */
-#define ASHMEM_IS_UNPINNED	0
-#define ASHMEM_IS_PINNED	1
-
-struct ashmem_pin {
-	__u32 offset;	/* offset into region, in bytes, page-aligned */
-	__u32 len;	/* length forward from offset, in bytes, page-aligned */
-};
-
-#define __ASHMEMIOC		0x77
-
-#define ASHMEM_SET_NAME		_IOW(__ASHMEMIOC, 1, char[ASHMEM_NAME_LEN])
-#define ASHMEM_GET_NAME		_IOR(__ASHMEMIOC, 2, char[ASHMEM_NAME_LEN])
-#define ASHMEM_SET_SIZE		_IOW(__ASHMEMIOC, 3, size_t)
-#define ASHMEM_GET_SIZE		_IO(__ASHMEMIOC, 4)
-#define ASHMEM_SET_PROT_MASK	_IOW(__ASHMEMIOC, 5, unsigned long)
-#define ASHMEM_GET_PROT_MASK	_IO(__ASHMEMIOC, 6)
-#define ASHMEM_PIN		_IOW(__ASHMEMIOC, 7, struct ashmem_pin)
-#define ASHMEM_UNPIN		_IOW(__ASHMEMIOC, 8, struct ashmem_pin)
-#define ASHMEM_GET_PIN_STATUS	_IO(__ASHMEMIOC, 9)
-#define ASHMEM_PURGE_ALL_CACHES	_IO(__ASHMEMIOC, 10)
-
-#endif	/* _UAPI_LINUX_ASHMEM_H */