Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=77f6af778dc23514d897f4fdc7935329285ecb1b
Commit: 77f6af778dc23514d897f4fdc7935329285ecb1b
Parent: 63843c265fd0e0c7894f713e0db5777560e756ae
Author: Jeff Dike <[EMAIL PROTECTED]>
AuthorDate: Sun May 6 14:51:40 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Mon May 7 12:13:03 2007 -0700
uml: don't try to handle signals on initial process stack
Code running on the initial UML stack can't receive or process signals since
current must be valid when IRQs are handled, and there is no current for
this
stack.
So, instead of using UML_LONGJMP and UML_SETJMP, which are careful to save
and
restore signal state, and, as a side-effect, handle any deferred signals,
start_idle_thread must use the bare equivalents, which don't do anything
with
signals.
Signed-off-by: Jeff Dike <[EMAIL PROTECTED]>
Cc: Paolo 'Blaisorblade' Giarrusso <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
arch/um/os-Linux/skas/process.c | 14 +++++++++++---
1 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 5b1943d..1f39f2b 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -494,7 +494,15 @@ int start_idle_thread(void *stack, jmp_buf *switch_buf)
SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGALRM,
SIGVTALRM, -1);
- n = UML_SETJMP(&initial_jmpbuf);
+ /*
+ * Can't use UML_SETJMP or UML_LONGJMP here because they save
+ * and restore signals, with the possible side-effect of
+ * trying to handle any signals which came when they were
+ * blocked, which can't be done on this stack.
+ * Signals must be blocked when jumping back here and restored
+ * after returning to the jumper.
+ */
+ n = setjmp(initial_jmpbuf);
switch(n){
case INIT_JMP_NEW_THREAD:
(*switch_buf)[0].JB_IP = (unsigned long) new_thread_handler;
@@ -504,7 +512,7 @@ int start_idle_thread(void *stack, jmp_buf *switch_buf)
break;
case INIT_JMP_CALLBACK:
(*cb_proc)(cb_arg);
- UML_LONGJMP(cb_back, 1);
+ longjmp(*cb_back, 1);
break;
case INIT_JMP_HALT:
kmalloc_ok = 0;
@@ -515,7 +523,7 @@ int start_idle_thread(void *stack, jmp_buf *switch_buf)
default:
panic("Bad sigsetjmp return in start_idle_thread - %d\n", n);
}
- UML_LONGJMP(switch_buf, 1);
+ longjmp(*switch_buf, 1);
}
void initial_thread_cb_skas(void (*proc)(void *), void *arg)
-
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