Messages in this thread Patch in this message |  | | | Subject | [PATCH] UML - Fix a signal race | | Date | Tue, 14 Sep 2004 03:27:52 -0400 | | From | Jeff Dike <> |
This patch saves and restores UML's idea of user mode across an interrupt. Without this, an interrupt arriving at the wrong time can cause UML to lose track of whether an interrupted handler is handing a userspace interrupt.
From Ingo Molnar Signed-off-by: Jeff Dike <jdike@addtoit.com>
Index: 2.6.9-rc2/arch/um/kernel/skas/trap_user.c =================================================================== --- 2.6.9-rc2.orig/arch/um/kernel/skas/trap_user.c 2004-09-14 02:03:52.000000000 -0400 +++ 2.6.9-rc2/arch/um/kernel/skas/trap_user.c 2004-09-14 02:04:00.000000000 -0400 @@ -19,8 +19,10 @@ struct skas_regs *r; struct signal_info *info; int save_errno = errno; + int save_user; r = &TASK_REGS(get_current())->skas; + save_user = r->is_user; r->is_user = 0; r->fault_addr = SC_FAULT_ADDR(sc); r->fault_type = SC_FAULT_TYPE(sc); @@ -33,6 +35,7 @@ (*info->handler)(sig, (union uml_pt_regs *) r); errno = save_errno; + r->is_user = save_user; } void user_signal(int sig, union uml_pt_regs *regs) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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