From 97195d6b411fec8e33aa55b6a7c3dde7984d65ca Mon Sep 17 00:00:00 2001 From: Hans-Joachim Picht Date: Fri, 30 May 2008 10:03:24 +0200 Subject: [PATCH 01/12] [S390] fix sparsemem related compile error with allnoconfig on s390 On s390 make allnoconfig fails with the following build error: arch/s390/mm/init.c: In function 'show_mem': arch/s390/mm/init.c:55: error: implicit declaration of function 'pfn_valid' make[1]: *** [arch/s390/mm/init.o] Error 1 make: *** [arch/s390/mm] Error 2 This problem can by fixed ensuring that ARCH_SELECT_MEMORY_MODEL is always turned on. Signed-off-by: Hans-Joachim Picht Signed-off-by: Martin Schwidefsky --- arch/s390/Kconfig | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 1d035082e78e..93acb3c1859d 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -308,6 +308,9 @@ config ARCH_SPARSEMEM_ENABLE config ARCH_SPARSEMEM_DEFAULT def_bool y +config ARCH_SELECT_MEMORY_MODEL + def_bool y + source "mm/Kconfig" comment "I/O subsystem configuration" From f71ad62a264a89cb1952df0c92b167005de8d1b0 Mon Sep 17 00:00:00 2001 From: Michael Holzheu Date: Fri, 30 May 2008 10:03:25 +0200 Subject: [PATCH 02/12] [S390] tape: Fix race condition in tape block device driver Due to incorrect function call sequence it can happen that a tape block request is finished before the request is taken from the block request queue. The following sequence leads to that condition: * tapeblock_start_request() -> start CCW program * Request finishes -> IO interrupt * tapeblock_end_request() * end_that_request_last() If blkdev_dequeue_request() has not been called before end_that_request_last(), a kernel bug is triggered in end_that_request_last() because the request is still queued. To solve that problem blkdev_dequeue_request() has to be called before starting the CCW program. Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky --- drivers/s390/char/tape_block.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c index ddc4a114e7f4..95da72bc17e8 100644 --- a/drivers/s390/char/tape_block.c +++ b/drivers/s390/char/tape_block.c @@ -179,11 +179,11 @@ tapeblock_requeue(struct work_struct *work) { tapeblock_end_request(req, -EIO); continue; } + blkdev_dequeue_request(req); + nr_queued++; spin_unlock_irq(&device->blk_data.request_queue_lock); rc = tapeblock_start_request(device, req); spin_lock_irq(&device->blk_data.request_queue_lock); - blkdev_dequeue_request(req); - nr_queued++; } spin_unlock_irq(&device->blk_data.request_queue_lock); atomic_set(&device->blk_data.requeue_scheduled, 0); From bebd9a455b2593ba6543b961bc82c43350c2d8d9 Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Fri, 30 May 2008 10:03:26 +0200 Subject: [PATCH 03/12] [S390] s390 types: make dma_addr_t 64 bit capable virtio tests with guests larger than 4 GB revealed that the dma_addr_t definition for s390 did not make it into the 64bit world. This patch changes the definition on s390 to have an u64 on 64bit and u32 on 32bit systems. Signed-off-by: Christian Borntraeger Signed-off-by: Martin Schwidefsky --- include/asm-s390/types.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/asm-s390/types.h b/include/asm-s390/types.h index 0e959e20e9a3..41c547656130 100644 --- a/include/asm-s390/types.h +++ b/include/asm-s390/types.h @@ -40,7 +40,13 @@ typedef __signed__ long saddr_t; #ifndef __ASSEMBLY__ +typedef u64 dma64_addr_t; +#ifdef __s390x__ +/* DMA addresses come in 32-bit and 64-bit flavours. */ +typedef u64 dma_addr_t; +#else typedef u32 dma_addr_t; +#endif #ifndef __s390x__ typedef union { From 67060d9c1f5d91c917cc51bed464cb5638eaddbc Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Fri, 30 May 2008 10:03:27 +0200 Subject: [PATCH 04/12] [S390] Fix section mismatch warnings. This fixes the last remaining section mismatch warnings in s390 architecture code. It reveals also a real bug introduced by... me with git commit 2069e978d5a6e7b45d58027e3de7f879b8c5e488 ("[S390] sparsemem vmemmap: initialize memmap.") Calling the generic vmemmap_alloc_block() function to get initialized memory is a nice idea, however that function is __meminit annotated and therefore the function might be gone if we try to call it later. This can happen if a DCSS segment gets added. So basically revert the patch and clear the memmap explicitly to fix the original bug. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/smp.c | 2 +- arch/s390/mm/vmem.c | 18 +++++++++++++----- drivers/s390/char/sclp_config.c | 2 +- 3 files changed, 15 insertions(+), 7 deletions(-) diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 1f4228948dc4..42b1d12ebb10 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -1089,7 +1089,7 @@ out: #ifdef CONFIG_HOTPLUG_CPU -int smp_rescan_cpus(void) +int __ref smp_rescan_cpus(void) { cpumask_t newcpus; int cpu; diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index ea2804808f39..f591188fa2c0 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -27,12 +27,19 @@ struct memory_segment { static LIST_HEAD(mem_segs); -static pud_t *vmem_pud_alloc(void) +static void __ref *vmem_alloc_pages(unsigned int order) +{ + if (slab_is_available()) + return (void *)__get_free_pages(GFP_KERNEL, order); + return alloc_bootmem_pages((1 << order) * PAGE_SIZE); +} + +static inline pud_t *vmem_pud_alloc(void) { pud_t *pud = NULL; #ifdef CONFIG_64BIT - pud = vmemmap_alloc_block(PAGE_SIZE * 4, 0); + pud = vmem_alloc_pages(2); if (!pud) return NULL; clear_table((unsigned long *) pud, _REGION3_ENTRY_EMPTY, PAGE_SIZE * 4); @@ -40,12 +47,12 @@ static pud_t *vmem_pud_alloc(void) return pud; } -static pmd_t *vmem_pmd_alloc(void) +static inline pmd_t *vmem_pmd_alloc(void) { pmd_t *pmd = NULL; #ifdef CONFIG_64BIT - pmd = vmemmap_alloc_block(PAGE_SIZE * 4, 0); + pmd = vmem_alloc_pages(2); if (!pmd) return NULL; clear_table((unsigned long *) pmd, _SEGMENT_ENTRY_EMPTY, PAGE_SIZE * 4); @@ -207,13 +214,14 @@ int __meminit vmemmap_populate(struct page *start, unsigned long nr, int node) if (pte_none(*pt_dir)) { unsigned long new_page; - new_page =__pa(vmemmap_alloc_block(PAGE_SIZE, 0)); + new_page =__pa(vmem_alloc_pages(0)); if (!new_page) goto out; pte = pfn_pte(new_page >> PAGE_SHIFT, PAGE_KERNEL); *pt_dir = pte; } } + memset(start, 0, nr * sizeof(struct page)); ret = 0; out: flush_tlb_kernel_range(start_addr, end_addr); diff --git a/drivers/s390/char/sclp_config.c b/drivers/s390/char/sclp_config.c index 9e784d5f7f57..ad05a87bc480 100644 --- a/drivers/s390/char/sclp_config.c +++ b/drivers/s390/char/sclp_config.c @@ -40,7 +40,7 @@ static void sclp_cpu_capability_notify(struct work_struct *work) put_online_cpus(); } -static void sclp_cpu_change_notify(struct work_struct *work) +static void __ref sclp_cpu_change_notify(struct work_struct *work) { smp_rescan_cpus(); } From 1760537b69123905bf4f4b56f5746ae4547e9694 Mon Sep 17 00:00:00 2001 From: Gerald Schaefer Date: Fri, 30 May 2008 10:03:28 +0200 Subject: [PATCH 05/12] [S390] appldata: prevent cpu hotplug when walking cpu_online_map. Use get_online_cpus() to prevent cpu hotplug in situations where for_each_online_cpu() is called. Signed-off-by: Gerald Schaefer Signed-off-by: Martin Schwidefsky --- arch/s390/appldata/appldata_base.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/s390/appldata/appldata_base.c b/arch/s390/appldata/appldata_base.c index 655d52543e2d..ad40729bec3d 100644 --- a/arch/s390/appldata/appldata_base.c +++ b/arch/s390/appldata/appldata_base.c @@ -130,6 +130,7 @@ static void appldata_work_fn(struct work_struct *work) P_DEBUG(" -= Work Queue =-\n"); i = 0; + get_online_cpus(); spin_lock(&appldata_ops_lock); list_for_each(lh, &appldata_ops_list) { ops = list_entry(lh, struct appldata_ops, list); @@ -140,6 +141,7 @@ static void appldata_work_fn(struct work_struct *work) } } spin_unlock(&appldata_ops_lock); + put_online_cpus(); } /* @@ -266,12 +268,14 @@ appldata_timer_handler(ctl_table *ctl, int write, struct file *filp, len = *lenp; if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len)) return -EFAULT; + get_online_cpus(); spin_lock(&appldata_timer_lock); if (buf[0] == '1') __appldata_vtimer_setup(APPLDATA_ADD_TIMER); else if (buf[0] == '0') __appldata_vtimer_setup(APPLDATA_DEL_TIMER); spin_unlock(&appldata_timer_lock); + put_online_cpus(); out: *lenp = len; *ppos += len; @@ -314,10 +318,12 @@ appldata_interval_handler(ctl_table *ctl, int write, struct file *filp, return -EINVAL; } + get_online_cpus(); spin_lock(&appldata_timer_lock); appldata_interval = interval; __appldata_vtimer_setup(APPLDATA_MOD_TIMER); spin_unlock(&appldata_timer_lock); + put_online_cpus(); P_INFO("Monitoring CPU interval set to %u milliseconds.\n", interval); @@ -556,8 +562,10 @@ static int __init appldata_init(void) return -ENOMEM; } + get_online_cpus(); for_each_online_cpu(i) appldata_online_cpu(i); + put_online_cpus(); /* Register cpu hotplug notifier */ register_hotcpu_notifier(&appldata_nb); From c1bb7f31eaef6ed6b9f895b99d9ea12e6b853606 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Fri, 30 May 2008 10:03:29 +0200 Subject: [PATCH 06/12] [S390] showmem: Only walk spanned pages. Convert show_mem() so its nearly the same as on x86/powerpc. Gives us proper locking and we get also rid of the only use of max_mapnr. Also the number of pages was contained in an int which might not be sufficient not too far in the future. Cc: Johannes Weiner Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/mm/init.c | 49 +++++++++++++++++++++------------------------ 1 file changed, 23 insertions(+), 26 deletions(-) diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 29f3a63806b9..05598649b326 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -44,37 +44,34 @@ char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); void show_mem(void) { - int i, total = 0, reserved = 0; - int shared = 0, cached = 0; + unsigned long i, total = 0, reserved = 0; + unsigned long shared = 0, cached = 0; + unsigned long flags; struct page *page; + pg_data_t *pgdat; printk("Mem-info:\n"); show_free_areas(); - i = max_mapnr; - while (i-- > 0) { - if (!pfn_valid(i)) - continue; - page = pfn_to_page(i); - total++; - if (PageReserved(page)) - reserved++; - else if (PageSwapCache(page)) - cached++; - else if (page_count(page)) - shared += page_count(page) - 1; + for_each_online_pgdat(pgdat) { + pgdat_resize_lock(pgdat, &flags); + for (i = 0; i < pgdat->node_spanned_pages; i++) { + if (!pfn_valid(pgdat->node_start_pfn + i)) + continue; + page = pfn_to_page(pgdat->node_start_pfn + i); + total++; + if (PageReserved(page)) + reserved++; + else if (PageSwapCache(page)) + cached++; + else if (page_count(page)) + shared += page_count(page) - 1; + } + pgdat_resize_unlock(pgdat, &flags); } - printk("%d pages of RAM\n", total); - printk("%d reserved pages\n", reserved); - printk("%d pages shared\n", shared); - printk("%d pages swap cached\n", cached); - - printk("%lu pages dirty\n", global_page_state(NR_FILE_DIRTY)); - printk("%lu pages writeback\n", global_page_state(NR_WRITEBACK)); - printk("%lu pages mapped\n", global_page_state(NR_FILE_MAPPED)); - printk("%lu pages slab\n", - global_page_state(NR_SLAB_RECLAIMABLE) + - global_page_state(NR_SLAB_UNRECLAIMABLE)); - printk("%lu pages pagetables\n", global_page_state(NR_PAGETABLE)); + printk("%ld pages of RAM\n", total); + printk("%ld reserved pages\n", reserved); + printk("%ld pages shared\n", shared); + printk("%ld pages swap cached\n", cached); } /* From d4820e44b0ae6830b1d634e6d0a425d839388c06 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Fri, 30 May 2008 10:03:30 +0200 Subject: [PATCH 07/12] [S390] sclp_vt220: fix scheduling while atomic bug. The driver incorrectly assumed that putchar will only be called from schedulable process context and therefore blocked and waited if no free output buffers where available. Since putchar may also be called from BH context this may lead to deadlocks. To fix this just return the number of characters accepted and let the upper layer handle the rest. The console write function will busy wait (sclp_sync_wait) until a buffer is available again. Cc: Peter Oberparleiter Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- drivers/s390/char/sclp_vt220.c | 27 +++++++-------------------- 1 file changed, 7 insertions(+), 20 deletions(-) diff --git a/drivers/s390/char/sclp_vt220.c b/drivers/s390/char/sclp_vt220.c index 35707c04e613..62576af36f47 100644 --- a/drivers/s390/char/sclp_vt220.c +++ b/drivers/s390/char/sclp_vt220.c @@ -71,9 +71,6 @@ static struct list_head sclp_vt220_outqueue; /* Number of requests in outqueue */ static int sclp_vt220_outqueue_count; -/* Wait queue used to delay write requests while we've run out of buffers */ -static wait_queue_head_t sclp_vt220_waitq; - /* Timer used for delaying write requests to merge subsequent messages into * a single buffer */ static struct timer_list sclp_vt220_timer; @@ -133,7 +130,6 @@ sclp_vt220_process_queue(struct sclp_vt220_request *request) } while (request && __sclp_vt220_emit(request)); if (request == NULL && sclp_vt220_flush_later) sclp_vt220_emit_current(); - wake_up(&sclp_vt220_waitq); /* Check if the tty needs a wake up call */ if (sclp_vt220_tty != NULL) { tty_wakeup(sclp_vt220_tty); @@ -383,7 +379,7 @@ sclp_vt220_timeout(unsigned long data) */ static int __sclp_vt220_write(const unsigned char *buf, int count, int do_schedule, - int convertlf, int may_schedule) + int convertlf, int may_fail) { unsigned long flags; void *page; @@ -395,15 +391,14 @@ __sclp_vt220_write(const unsigned char *buf, int count, int do_schedule, overall_written = 0; spin_lock_irqsave(&sclp_vt220_lock, flags); do { - /* Create a sclp output buffer if none exists yet */ + /* Create an sclp output buffer if none exists yet */ if (sclp_vt220_current_request == NULL) { while (list_empty(&sclp_vt220_empty)) { spin_unlock_irqrestore(&sclp_vt220_lock, flags); - if (in_interrupt() || !may_schedule) - sclp_sync_wait(); + if (may_fail) + goto out; else - wait_event(sclp_vt220_waitq, - !list_empty(&sclp_vt220_empty)); + sclp_sync_wait(); spin_lock_irqsave(&sclp_vt220_lock, flags); } page = (void *) sclp_vt220_empty.next; @@ -437,6 +432,7 @@ __sclp_vt220_write(const unsigned char *buf, int count, int do_schedule, add_timer(&sclp_vt220_timer); } spin_unlock_irqrestore(&sclp_vt220_lock, flags); +out: return overall_written; } @@ -520,19 +516,11 @@ sclp_vt220_close(struct tty_struct *tty, struct file *filp) * character to the tty device. If the kernel uses this routine, * it must call the flush_chars() routine (if defined) when it is * done stuffing characters into the driver. - * - * NOTE: include/linux/tty_driver.h specifies that a character should be - * ignored if there is no room in the queue. This driver implements a different - * semantic in that it will block when there is no more room left. - * - * FIXME: putchar can currently be called from BH and other non blocking - * handlers so this semantic isn't a good idea. */ static int sclp_vt220_put_char(struct tty_struct *tty, unsigned char ch) { - __sclp_vt220_write(&ch, 1, 0, 0, 1); - return 1; + return __sclp_vt220_write(&ch, 1, 0, 0, 1); } /* @@ -653,7 +641,6 @@ static int __init __sclp_vt220_init(void) spin_lock_init(&sclp_vt220_lock); INIT_LIST_HEAD(&sclp_vt220_empty); INIT_LIST_HEAD(&sclp_vt220_outqueue); - init_waitqueue_head(&sclp_vt220_waitq); init_timer(&sclp_vt220_timer); sclp_vt220_current_request = NULL; sclp_vt220_buffered_chars = 0; From c80ee724966a8ce9a68020d9095233fb1c6f57e8 Mon Sep 17 00:00:00 2001 From: Stefan Haberland Date: Fri, 30 May 2008 10:03:31 +0200 Subject: [PATCH 08/12] [S390] dasd: use a generic wait_queue for sleep_on Use a generic wait_queue to prevent the wait_queue in dasd_sleep_on_ functions from being referenced by callback_data while it does not exist any more. Signed-off-by: Stefan Haberland Signed-off-by: Martin Schwidefsky --- drivers/s390/block/dasd.c | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-) diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index 8ba3f135da22..1a4025683362 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -63,6 +63,7 @@ static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); */ static wait_queue_head_t dasd_init_waitq; static wait_queue_head_t dasd_flush_wq; +static wait_queue_head_t generic_waitq; /* * Allocate memory for a new device structure. @@ -1151,11 +1152,15 @@ static void __dasd_device_process_final_queue(struct dasd_device *device, struct list_head *l, *n; struct dasd_ccw_req *cqr; struct dasd_block *block; + void (*callback)(struct dasd_ccw_req *, void *data); + void *callback_data; list_for_each_safe(l, n, final_queue) { cqr = list_entry(l, struct dasd_ccw_req, devlist); list_del_init(&cqr->devlist); block = cqr->block; + callback = cqr->callback; + callback_data = cqr->callback_data; if (block) spin_lock_bh(&block->queue_lock); switch (cqr->status) { @@ -1176,7 +1181,7 @@ static void __dasd_device_process_final_queue(struct dasd_device *device, BUG(); } if (cqr->callback != NULL) - (cqr->callback)(cqr, cqr->callback_data); + (callback)(cqr, callback_data); if (block) spin_unlock_bh(&block->queue_lock); } @@ -1406,17 +1411,15 @@ static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) */ int dasd_sleep_on(struct dasd_ccw_req *cqr) { - wait_queue_head_t wait_q; struct dasd_device *device; int rc; device = cqr->startdev; - init_waitqueue_head (&wait_q); cqr->callback = dasd_wakeup_cb; - cqr->callback_data = (void *) &wait_q; + cqr->callback_data = (void *) &generic_waitq; dasd_add_request_tail(cqr); - wait_event(wait_q, _wait_for_wakeup(cqr)); + wait_event(generic_waitq, _wait_for_wakeup(cqr)); /* Request status is either done or failed. */ rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; @@ -1429,20 +1432,18 @@ int dasd_sleep_on(struct dasd_ccw_req *cqr) */ int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) { - wait_queue_head_t wait_q; struct dasd_device *device; int rc; device = cqr->startdev; - init_waitqueue_head (&wait_q); cqr->callback = dasd_wakeup_cb; - cqr->callback_data = (void *) &wait_q; + cqr->callback_data = (void *) &generic_waitq; dasd_add_request_tail(cqr); - rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr)); + rc = wait_event_interruptible(generic_waitq, _wait_for_wakeup(cqr)); if (rc == -ERESTARTSYS) { dasd_cancel_req(cqr); /* wait (non-interruptible) for final status */ - wait_event(wait_q, _wait_for_wakeup(cqr)); + wait_event(generic_waitq, _wait_for_wakeup(cqr)); } rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; return rc; @@ -1466,7 +1467,6 @@ static inline int _dasd_term_running_cqr(struct dasd_device *device) int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) { - wait_queue_head_t wait_q; struct dasd_device *device; int rc; @@ -1478,9 +1478,8 @@ int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) return rc; } - init_waitqueue_head (&wait_q); cqr->callback = dasd_wakeup_cb; - cqr->callback_data = (void *) &wait_q; + cqr->callback_data = (void *) &generic_waitq; cqr->status = DASD_CQR_QUEUED; list_add(&cqr->devlist, &device->ccw_queue); @@ -1489,7 +1488,7 @@ int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) spin_unlock_irq(get_ccwdev_lock(device->cdev)); - wait_event(wait_q, _wait_for_wakeup(cqr)); + wait_event(generic_waitq, _wait_for_wakeup(cqr)); /* Request status is either done or failed. */ rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; @@ -2430,6 +2429,7 @@ static int __init dasd_init(void) init_waitqueue_head(&dasd_init_waitq); init_waitqueue_head(&dasd_flush_wq); + init_waitqueue_head(&generic_waitq); /* register 'common' DASD debug area, used for all DBF_XXX calls */ dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); From 54ad64129cc166b9eec7151f3f9fc83589e33555 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Fri, 30 May 2008 10:03:32 +0200 Subject: [PATCH 09/12] [S390] 3270: fix race with stack local wait_queue_head_t. A wait_event call with a stack local wait_queue_head_t structure that is used to do the wake up for the wait_event is inherently racy. After the wait_event finished the wake_up call might not have completed yet. Remove the stack local wait_queue_head_t from raw3270_start_init and use the global raw3270_wait_queue instead. Signed-off-by: Martin Schwidefsky --- drivers/s390/char/raw3270.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/drivers/s390/char/raw3270.c b/drivers/s390/char/raw3270.c index 0d98f1ff2edd..848ef7e8523f 100644 --- a/drivers/s390/char/raw3270.c +++ b/drivers/s390/char/raw3270.c @@ -549,7 +549,6 @@ raw3270_start_init(struct raw3270 *rp, struct raw3270_view *view, struct raw3270_request *rq) { unsigned long flags; - wait_queue_head_t wq; int rc; #ifdef CONFIG_TN3270_CONSOLE @@ -566,20 +565,20 @@ raw3270_start_init(struct raw3270 *rp, struct raw3270_view *view, return rq->rc; } #endif - init_waitqueue_head(&wq); rq->callback = raw3270_wake_init; - rq->callback_data = &wq; + rq->callback_data = &raw3270_wait_queue; spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags); rc = __raw3270_start(rp, view, rq); spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags); if (rc) return rc; /* Now wait for the completion. */ - rc = wait_event_interruptible(wq, raw3270_request_final(rq)); + rc = wait_event_interruptible(raw3270_wait_queue, + raw3270_request_final(rq)); if (rc == -ERESTARTSYS) { /* Interrupted by a signal. */ raw3270_halt_io(view->dev, rq); /* No wait for the halt to complete. */ - wait_event(wq, raw3270_request_final(rq)); + wait_event(raw3270_wait_queue, raw3270_request_final(rq)); return -ERESTARTSYS; } return rq->rc; From 4657fb8a98a4e02981a574492bbe470c147b6657 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Fri, 30 May 2008 10:03:33 +0200 Subject: [PATCH 10/12] [S390] tape: fix race with stack local wait_queue_head_t. A wait_event call with a stack local wait_queue_head_t structure that is used to do the wake up for the wait_event is inherently racy. After the wait_event finished the wake_up call might not have completed yet. Replace the stack local wait_queue_head_t in tape_do_io and tape_do_io_interruptible with a per device wait queue. Signed-off-by: Martin Schwidefsky --- drivers/s390/char/tape.h | 3 +++ drivers/s390/char/tape_core.c | 16 +++++++--------- 2 files changed, 10 insertions(+), 9 deletions(-) diff --git a/drivers/s390/char/tape.h b/drivers/s390/char/tape.h index dddf8d62c153..d0d565a05dfe 100644 --- a/drivers/s390/char/tape.h +++ b/drivers/s390/char/tape.h @@ -231,6 +231,9 @@ struct tape_device { /* Request queue. */ struct list_head req_queue; + /* Request wait queue. */ + wait_queue_head_t wait_queue; + /* Each tape device has (currently) two minor numbers. */ int first_minor; diff --git a/drivers/s390/char/tape_core.c b/drivers/s390/char/tape_core.c index 76e44eb7c47f..c20e3c548343 100644 --- a/drivers/s390/char/tape_core.c +++ b/drivers/s390/char/tape_core.c @@ -449,6 +449,7 @@ tape_alloc_device(void) INIT_LIST_HEAD(&device->req_queue); INIT_LIST_HEAD(&device->node); init_waitqueue_head(&device->state_change_wq); + init_waitqueue_head(&device->wait_queue); device->tape_state = TS_INIT; device->medium_state = MS_UNKNOWN; *device->modeset_byte = 0; @@ -954,21 +955,19 @@ __tape_wake_up(struct tape_request *request, void *data) int tape_do_io(struct tape_device *device, struct tape_request *request) { - wait_queue_head_t wq; int rc; - init_waitqueue_head(&wq); spin_lock_irq(get_ccwdev_lock(device->cdev)); /* Setup callback */ request->callback = __tape_wake_up; - request->callback_data = &wq; + request->callback_data = &device->wait_queue; /* Add request to request queue and try to start it. */ rc = __tape_start_request(device, request); spin_unlock_irq(get_ccwdev_lock(device->cdev)); if (rc) return rc; /* Request added to the queue. Wait for its completion. */ - wait_event(wq, (request->callback == NULL)); + wait_event(device->wait_queue, (request->callback == NULL)); /* Get rc from request */ return request->rc; } @@ -989,20 +988,19 @@ int tape_do_io_interruptible(struct tape_device *device, struct tape_request *request) { - wait_queue_head_t wq; int rc; - init_waitqueue_head(&wq); spin_lock_irq(get_ccwdev_lock(device->cdev)); /* Setup callback */ request->callback = __tape_wake_up_interruptible; - request->callback_data = &wq; + request->callback_data = &device->wait_queue; rc = __tape_start_request(device, request); spin_unlock_irq(get_ccwdev_lock(device->cdev)); if (rc) return rc; /* Request added to the queue. Wait for its completion. */ - rc = wait_event_interruptible(wq, (request->callback == NULL)); + rc = wait_event_interruptible(device->wait_queue, + (request->callback == NULL)); if (rc != -ERESTARTSYS) /* Request finished normally. */ return request->rc; @@ -1015,7 +1013,7 @@ tape_do_io_interruptible(struct tape_device *device, /* Wait for the interrupt that acknowledges the halt. */ do { rc = wait_event_interruptible( - wq, + device->wait_queue, (request->callback == NULL) ); } while (rc == -ERESTARTSYS); From 209fb9090f4ca5874289c9ca82991393f85c1eff Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Fri, 30 May 2008 10:03:34 +0200 Subject: [PATCH 11/12] [S390] disassembler: fix idte instruction format. The correct instruction format of idte is "idte r1,r3,r2" with r1 at bit 24, r3 at bit 16 and r2 at bit 28. Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/dis.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/kernel/dis.c b/arch/s390/kernel/dis.c index c14a336f6300..d2f270c995d9 100644 --- a/arch/s390/kernel/dis.c +++ b/arch/s390/kernel/dis.c @@ -208,7 +208,7 @@ static const unsigned char formats[][7] = { [INSTR_RRF_F0FF] = { 0xff, F_16,F_24,F_28,0,0,0 }, /* e.g. madbr */ [INSTR_RRF_FUFF] = { 0xff, F_24,F_16,F_28,U4_20,0,0 },/* e.g. didbr */ [INSTR_RRF_RURR] = { 0xff, R_24,R_28,R_16,U4_20,0,0 },/* e.g. .insn */ - [INSTR_RRF_R0RR] = { 0xff, R_24,R_28,R_16,0,0,0 }, /* e.g. idte */ + [INSTR_RRF_R0RR] = { 0xff, R_24,R_16,R_28,0,0,0 }, /* e.g. idte */ [INSTR_RRF_U0FF] = { 0xff, F_24,U4_16,F_28,0,0,0 }, /* e.g. fixr */ [INSTR_RRF_U0RF] = { 0xff, R_24,U4_16,F_28,0,0,0 }, /* e.g. cfebr */ [INSTR_RRF_M0RR] = { 0xff, R_24,R_28,M_16,0,0,0 }, /* e.g. sske */ From 0066ed55a9a061ed64bbc09c16f45daf0b976ac5 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Fri, 30 May 2008 10:03:35 +0200 Subject: [PATCH 12/12] [S390] Update default configuration. Signed-off-by: Martin Schwidefsky --- arch/s390/defconfig | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/arch/s390/defconfig b/arch/s390/defconfig index aa341d0ea1e6..c5cdb975d590 100644 --- a/arch/s390/defconfig +++ b/arch/s390/defconfig @@ -1,7 +1,7 @@ # # Automatically generated make config: don't edit -# Linux kernel version: 2.6.25 -# Wed Apr 30 11:07:45 2008 +# Linux kernel version: 2.6.26-rc4 +# Fri May 30 09:49:33 2008 # CONFIG_SCHED_MC=y CONFIG_MMU=y @@ -103,6 +103,7 @@ CONFIG_RT_MUTEXES=y # CONFIG_TINY_SHMEM is not set CONFIG_BASE_SMALL=0 CONFIG_MODULES=y +# CONFIG_MODULE_FORCE_LOAD is not set CONFIG_MODULE_UNLOAD=y # CONFIG_MODULE_FORCE_UNLOAD is not set CONFIG_MODVERSIONS=y @@ -173,6 +174,7 @@ CONFIG_PREEMPT=y # CONFIG_PREEMPT_RCU is not set CONFIG_ARCH_SPARSEMEM_ENABLE=y CONFIG_ARCH_SPARSEMEM_DEFAULT=y +CONFIG_ARCH_SELECT_MEMORY_MODEL=y CONFIG_SELECT_MEMORY_MODEL=y # CONFIG_FLATMEM_MANUAL is not set # CONFIG_DISCONTIGMEM_MANUAL is not set @@ -210,6 +212,7 @@ CONFIG_FORCE_MAX_ZONEORDER=9 CONFIG_PFAULT=y # CONFIG_SHARED_KERNEL is not set # CONFIG_CMM is not set +# CONFIG_PAGE_STATES is not set CONFIG_VIRT_TIMER=y CONFIG_VIRT_CPU_ACCOUNTING=y # CONFIG_APPLDATA_BASE is not set @@ -620,6 +623,7 @@ CONFIG_S390_VMUR=m # # CONFIG_MEMSTICK is not set # CONFIG_NEW_LEDS is not set +CONFIG_ACCESSIBILITY=y # # File systems @@ -754,11 +758,12 @@ CONFIG_FRAME_WARN=2048 CONFIG_MAGIC_SYSRQ=y # CONFIG_UNUSED_SYMBOLS is not set CONFIG_DEBUG_FS=y -CONFIG_HEADERS_CHECK=y +# CONFIG_HEADERS_CHECK is not set CONFIG_DEBUG_KERNEL=y # CONFIG_SCHED_DEBUG is not set # CONFIG_SCHEDSTATS is not set # CONFIG_TIMER_STATS is not set +# CONFIG_DEBUG_OBJECTS is not set # CONFIG_DEBUG_SLAB is not set CONFIG_DEBUG_PREEMPT=y # CONFIG_DEBUG_RT_MUTEXES is not set