[mirror_ubuntu-bionic-kernel.git] / arch / arm / include / asm / cache.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  arch/arm/include/asm/cache.h
 */
#ifndef __ASMARM_CACHE_H
#define __ASMARM_CACHE_H

#define L1_CACHE_SHIFT		CONFIG_ARM_L1_CACHE_SHIFT
#define L1_CACHE_BYTES		(1 << L1_CACHE_SHIFT)

/*
 * Memory returned by kmalloc() may be used for DMA, so we must make
 * sure that all such allocations are cache aligned. Otherwise,
 * unrelated code may cause parts of the buffer to be read into the
 * cache before the transfer is done, causing old data to be seen by
 * the CPU.
 */
#define ARCH_DMA_MINALIGN	L1_CACHE_BYTES

/*
 * With EABI on ARMv5 and above we must have 64-bit aligned slab pointers.
 */
#if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
#define ARCH_SLAB_MINALIGN 8
#endif

#define __read_mostly __attribute__((__section__(".data..read_mostly")))

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4	2	/*
4baa9922	3	* arch/arm/include/asm/cache.h
1da177e4 LT	4	*/
	5	#ifndef __ASMARM_CACHE_H
	6	#define __ASMARM_CACHE_H
	7
910a17e5	8	#define L1_CACHE_SHIFT CONFIG_ARM_L1_CACHE_SHIFT
1da177e4 LT	9	#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
1da177e4 LT	10
eb5f4ca9 MF	11	/*
	12	* Memory returned by kmalloc() may be used for DMA, so we must make
	13	* sure that all such allocations are cache aligned. Otherwise,
	14	* unrelated code may cause parts of the buffer to be read into the
	15	* cache before the transfer is done, causing old data to be seen by
	16	* the CPU.
	17	*/
a6eb9fe1	18	#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
eb5f4ca9 MF	19
	20	/*
	21	* With EABI on ARMv5 and above we must have 64-bit aligned slab pointers.
	22	*/
	23	#if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
	24	#define ARCH_SLAB_MINALIGN 8
	25	#endif
	26
daf87416 RK	27	#define __read_mostly __attribute__((__section__(".data..read_mostly")))
daf87416 RK	28
1da177e4	29	#endif