entry: Add support for TIF_NOTIFY_SIGNAL
stable inclusion from stable-v5.10.162 commit 3c295bd2ddaecf3509458c86bf7ba610042f3609 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I6BTWC CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.168&id=3c295bd2ddaecf3509458c86bf7ba610042f3609 -------------------------------- [ Upstream commit 12db8b69 ] Add TIF_NOTIFY_SIGNAL handling in the generic entry code, which if set, will return true if signal_pending() is used in a wait loop. That causes an exit of the loop so that notify_signal tracehooks can be run. If the wait loop is currently inside a system call, the system call is restarted once task_work has been processed. In preparation for only having arch_do_signal() handle syscall restarts if _TIF_SIGPENDING isn't set, rename it to arch_do_signal_or_restart(). Pass in a boolean that tells the architecture specific signal handler if it should attempt to get a signal, or just process a potential syscall restart. For !CONFIG_GENERIC_ENTRY archs, add the TIF_NOTIFY_SIGNAL handling to get_signal(). This is done to minimize the needed architecture changes to support this feature. Signed-off-by: NJens Axboe <axboe@kernel.dk> Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Reviewed-by: NOleg Nesterov <oleg@redhat.com> Link: https://lore.kernel.org/r/20201026203230.386348-3-axboe@kernel.dkSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Conflict: include/linux/tracehook.h Signed-off-by: NLi Lingfeng <lilingfeng3@huawei.com> Acked-by: NZhang Yi <yi.zhang@huawei.com> Reviewed-by: NWang Weiyang <wangweiyang2@huawei.com> Signed-off-by: NJialin Zhang <zhangjialin11@huawei.com>
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