Il giorno mar, 08/08/2017 alle 18.17 -0400, Murali Karicheri ha scritto: > Is there an skb_alloc function that can be used from interrupt > handler? Looks like netdev_alloc_skb() > can't be used since I see following trace with kernel hack debug > options enabled. > > [ 652.481713] [<c021007c>] (unwind_backtrace) from [<c020bdcc>] > (show_stack+0x10/0x14) > [ 652.481725] [<c020bdcc>] (show_stack) from [<c0517780>] > (dump_stack+0x98/0xc4) > [ 652.481736] [<c0517780>] (dump_stack) from [<c0256a70>] > (___might_sleep+0x1b8/0x2a4) > [ 652.481746] [<c0256a70>] (___might_sleep) from [<c0939e80>] > (rt_spin_lock+0x24/0x5c) > [ 652.481755] [<c0939e80>] (rt_spin_lock) from [<c07d827c>] > (__netdev_alloc_skb+0xd0/0x254) > [ 652.481774] [<c07d827c>] (__netdev_alloc_skb) from [<bf23a544>] > (emac_rx_hardirq+0x374/0x554 [prueth]) > [ 652.481793] [<bf23a544>] (emac_rx_hardirq [prueth]) from > [<c02925dc>] (__handle_irq_event_percpu+0x9c/0x128) > > This is running under RT kernel off 4.9.y >
netdev_alloc_skb() passes GFP_ATOMIC to alloc_skb() so it should work in an interrupt handler too. -- Matteo Croce per aspera ad upstream