From 9cc63f8bcd560c760d0b12e15bba8f81c86237cf Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 14 Aug 2026 15:43:51 -0700 Subject: Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEAD Changes: Make expedited grace periods expedite normal RCU callbacks Miscellaneous fixes: * Improve diagnostic output with character task states. * Mark accesses to inform KCSAN of concurrency design. * Move from kmalloc() to kmalloc_obj(). * Documentation updates. * Improve handling of RCU deferred quiescent states. * Clean up unused function arguments and structure fields. * Reduce show_rcu_gp_kthreads() stack space. Tasks RCU updates: * Clean up after SRCU re-implementation of Tasks Trace RCU. * Mark accesses to inform KCSAN of concurrency design. * Add ->lazy_timer status to diagnostic output. * Remove an unnecessary memory barrier. * Fix a data race, courtesy of KCSAN. * Documentation updates. * Convert cond_resched_tasks_rcu_qs() from macro to static inline function. SRCU updates: * Add Rust helpers for SRCU. * Avoid losing queued work at cleanup_srcu_struct() time. Torture-test updates: * Preparation work for immediate RCU priority deboosting. * Test RCU readers from real interrupt handlers (as opposed to softirq). * Simplify code through use of cpumask_next_wrap(). * Improve diagnostic output with character task states. * Add rcutorture.nwriters parameter to allow lightweight stall testing, and rcutorture.stall_only to make doing so easier. * Test an RCU Tasks Trace grace period implying an RCU grace period. * Make RCU Tasks Trace torturing track reader batches. * Fix a data race, courtesy of KCSAN. * Plug a shuffle_tmp_mask memory leak on kthread spawn failure. --- block/partitions/mac.c | 157 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 157 insertions(+) create mode 100644 block/partitions/mac.c (limited to 'block/partitions/mac.c') diff --git a/block/partitions/mac.c b/block/partitions/mac.c new file mode 100644 index 000000000..df03ca428 --- /dev/null +++ b/block/partitions/mac.c @@ -0,0 +1,157 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * fs/partitions/mac.c + * + * Code extracted from drivers/block/genhd.c + * Copyright (C) 1991-1998 Linus Torvalds + * Re-organised Feb 1998 Russell King + */ + +#include +#include "check.h" +#include "mac.h" + +#ifdef CONFIG_PPC_PMAC +#include +extern void note_bootable_part(dev_t dev, int part, int goodness); +#endif + +/* + * Code to understand MacOS partition tables. + */ + +#ifdef CONFIG_PPC_PMAC +static inline void mac_fix_string(char *stg, int len) +{ + int i; + + for (i = len - 1; i >= 0 && stg[i] == ' '; i--) + stg[i] = 0; +} +#endif + +int mac_partition(struct parsed_partitions *state) +{ + Sector sect; + unsigned char *data; + int slot, blocks_in_map; + unsigned secsize, datasize, partoffset; +#ifdef CONFIG_PPC_PMAC + int found_root = 0; + int found_root_goodness = 0; +#endif + struct mac_partition *part; + struct mac_driver_desc *md; + + /* Get 0th block and look at the first partition map entry. */ + md = read_part_sector(state, 0, §); + if (!md) + return -1; + if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) { + put_dev_sector(sect); + return 0; + } + secsize = be16_to_cpu(md->block_size); + put_dev_sector(sect); + + /* + * If the "block size" is not a power of 2, things get weird - we might + * end up with a partition straddling a sector boundary, so we wouldn't + * be able to read a partition entry with read_part_sector(). + * Real block sizes are probably (?) powers of two, so just require + * that. + */ + if (!is_power_of_2(secsize)) + return -1; + datasize = round_down(secsize, 512); + data = read_part_sector(state, datasize / 512, §); + if (!data) + return -1; + partoffset = secsize % 512; + if (partoffset + sizeof(*part) > datasize) { + put_dev_sector(sect); + return -1; + } + part = (struct mac_partition *) (data + partoffset); + if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) { + put_dev_sector(sect); + return 0; /* not a MacOS disk */ + } + blocks_in_map = be32_to_cpu(part->map_count); + if (blocks_in_map < 0 || blocks_in_map >= DISK_MAX_PARTS) { + put_dev_sector(sect); + return 0; + } + + if (blocks_in_map >= state->limit) + blocks_in_map = state->limit - 1; + + seq_buf_puts(&state->pp_buf, " [mac]"); + for (slot = 1; slot <= blocks_in_map; ++slot) { + int pos = slot * secsize; + put_dev_sector(sect); + data = read_part_sector(state, pos/512, §); + if (!data) + return -1; + part = (struct mac_partition *) (data + pos%512); + if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) + break; + put_partition(state, slot, + be32_to_cpu(part->start_block) * (secsize/512), + be32_to_cpu(part->block_count) * (secsize/512)); + + if (!strncasecmp(part->type, "Linux_RAID", 10)) + state->parts[slot].flags = ADDPART_FLAG_RAID; +#ifdef CONFIG_PPC_PMAC + /* + * If this is the first bootable partition, tell the + * setup code, in case it wants to make this the root. + */ + if (machine_is(powermac)) { + int goodness = 0; + + mac_fix_string(part->processor, 16); + mac_fix_string(part->name, 32); + mac_fix_string(part->type, 32); + + if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE) + && strcasecmp(part->processor, "powerpc") == 0) + goodness++; + + if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0 + || (strncasecmp(part->type, "Linux", 5) == 0 + && strcasecmp(part->type, "Linux_swap") != 0)) { + int i, l; + + goodness++; + l = strnlen(part->name, sizeof(part->name)); + if (strncmp(part->name, "/", sizeof(part->name)) == 0) + goodness++; + for (i = 0; i <= l - 4; ++i) { + if (strncasecmp(part->name + i, "root", + 4) == 0) { + goodness += 2; + break; + } + } + if (strncasecmp(part->name, "swap", 4) == 0) + goodness--; + } + + if (goodness > found_root_goodness) { + found_root = slot; + found_root_goodness = goodness; + } + } +#endif /* CONFIG_PPC_PMAC */ + } +#ifdef CONFIG_PPC_PMAC + if (found_root_goodness) + note_bootable_part(state->disk->part0->bd_dev, found_root, + found_root_goodness); +#endif + + put_dev_sector(sect); + seq_buf_puts(&state->pp_buf, "\n"); + return 1; +} -- cgit v1.3.1