#ifndef DIE_H #define DIE_H #include #include #include #include #include #include #include #include #include "built_in.h" extern void panic_handler_add(void (*on_panic)(void *arg), void *arg); extern void call_panic_handlers(void); static inline void panic(const char *format, ...) __check_format_printf(1, 2); static inline void syslog_panic(const char *format, ...) __check_format_printf(1, 2); static inline void syslog_maybe(bool cond, int priority, const char *format, ...) __check_format_printf(3, 4); static inline void __noreturn __die_hard(void) { call_panic_handlers(); exit(EXIT_FAILURE); } static inline void __noreturn __die_harder(void) { call_panic_handlers(); _exit(EXIT_FAILURE); } static inline void __noreturn die(void) { __die_hard(); } static inline void __noreturn _die(void) { __die_harder(); } static inline void __noreturn panic(const char *format, ...) { va_list vl; va_start(vl, format); vfprintf(stderr, format, vl); va_end(vl); die(); } static inline void __noreturn syslog_panic(const char *format, ...) { va_list vl; va_start(vl, format); vsyslog(LOG_ERR, format, vl); va_end(vl); die(); } static inline void syslog_maybe(bool cond, int priority, const char *format, ...) { if (cond) { va_list vl; va_start(vl, format); vsyslog(priority, format, vl); va_end(vl); } } #endif /* DIE_H */ ub'>net-next plumbingsTobias Klauser
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authorDexuan Cui <decui@microsoft.com>2017-01-28 11:46:02 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-31 10:59:48 +0100
commit433e19cf33d34bb6751c874a9c00980552fe508c (patch)
treece6547ef2987fbb289fa28f03536328a42781651 /arch/arm
parent191e885a2e130e639bb0c8ee350d7047294f2ce6 (diff)
Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()
Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") added the proper mb(), but removed the test "prev_write_sz < pending_sz" when making the signal decision. As a result, the guest can signal the host unnecessarily, and then the host can throttle the guest because the host thinks the guest is buggy or malicious; finally the user running stress test can perceive intermittent freeze of the guest. This patch brings back the test, and properly handles the in-place consumption APIs used by NetVSC (see get_next_pkt_raw(), put_pkt_raw() and commit_rd_index()). Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") Signed-off-by: Dexuan Cui <decui@microsoft.com> Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Tested-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm')