cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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blockgroup_lock.h (810B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _LINUX_BLOCKGROUP_LOCK_H
      3#define _LINUX_BLOCKGROUP_LOCK_H
      4/*
      5 * Per-blockgroup locking for ext2 and ext3.
      6 *
      7 * Simple hashed spinlocking.
      8 */
      9
     10#include <linux/spinlock.h>
     11#include <linux/cache.h>
     12
     13#ifdef CONFIG_SMP
     14#define NR_BG_LOCKS	(4 << ilog2(NR_CPUS < 32 ? NR_CPUS : 32))
     15#else
     16#define NR_BG_LOCKS	1
     17#endif
     18
     19struct bgl_lock {
     20	spinlock_t lock;
     21} ____cacheline_aligned_in_smp;
     22
     23struct blockgroup_lock {
     24	struct bgl_lock locks[NR_BG_LOCKS];
     25};
     26
     27static inline void bgl_lock_init(struct blockgroup_lock *bgl)
     28{
     29	int i;
     30
     31	for (i = 0; i < NR_BG_LOCKS; i++)
     32		spin_lock_init(&bgl->locks[i].lock);
     33}
     34
     35static inline spinlock_t *
     36bgl_lock_ptr(struct blockgroup_lock *bgl, unsigned int block_group)
     37{
     38	return &bgl->locks[block_group & (NR_BG_LOCKS-1)].lock;
     39}
     40
     41#endif