/* * Provide a default dump_stack() function for architectures * which don't implement their own. */ #include #include #include #include #include static void __dump_stack(void) { dump_stack_print_info(KERN_DEFAULT); show_stack(NULL, NULL); } /** * dump_stack - dump the current task information and its stack trace * * Architectures can override this implementation by implementing its own. */ #ifdef CONFIG_SMP static atomic_t dump_lock = ATOMIC_INIT(-1); asmlinkage __visible void dump_stack(void) { unsigned long flags; int was_locked; int old; int cpu; /* * Permit this cpu to perform nested stack dumps while serialising * against other CPUs */ retry: local_irq_save(flags); cpu = smp_processor_id(); old = atomic_cmpxchg(&dump_lock, -1, cpu); if (old == -1) { was_locked = 0; } else if (old == cpu) { was_locked = 1; } else { local_irq_restore(flags); cpu_relax(); goto retry; } __dump_stack(); if (!was_locked) atomic_set(&dump_lock, -1); local_irq_restore(flags); } #else asmlinkage __visible void dump_stack(void) { __dump_stack(); } #endif EXPORT_SYMBOL(dump_stack); vate-remove net-next plumbingsTobias Klauser
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authorChristoph Hellwig <hch@lst.de>2017-02-05 18:10:35 +0100
committerJens Axboe <axboe@fb.com>2017-02-06 09:34:46 -0700
commiteeeefd41843218c55a8782a6920f044d9bf6207a (patch)
treec342eac46626e62745aa8e1a982626efca8b121d /net/netlabel
parentc14024dbb156c8392908aaa822097d27c6af8ec8 (diff)
block: don't try Write Same from __blkdev_issue_zeroout
Write Same can return an error asynchronously if it turns out the underlying SCSI device does not support Write Same, which makes a proper fallback to other methods in __blkdev_issue_zeroout impossible. Thus only issue a Write Same from blkdev_issue_zeroout an don't try it at all from __blkdev_issue_zeroout as a non-invasive workaround. Signed-off-by: Christoph Hellwig <hch@lst.de> Reported-by: Junichi Nomura <j-nomura@ce.jp.nec.com> Fixes: e73c23ff ("block: add async variant of blkdev_issue_zeroout") Tested-by: Junichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'net/netlabel')