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authorPaul Mackerras <paulus@samba.org>2005-09-10 21:13:11 +1000
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-10 10:15:11 -0700
commitbb0bb3b6596cdb08adb0b72453cc67d48e139c2c (patch)
treef9116ed650d499d405a3fe021c473f9558897d96 /arch/ppc/mm
parent1e63bc7342c40f0f1dd83d80d368665bd06f4963 (diff)
downloadlinux-linaro-stable-bb0bb3b6596cdb08adb0b72453cc67d48e139c2c.tar.gz
[PATCH] ppc32: Kill init on unhandled synchronous signals
This is a patch that I have had in my tree for ages. If init causes an exception that raises a signal, such as a SIGSEGV, SIGILL or SIGFPE, and it hasn't registered a handler for it, we don't deliver the signal, since init doesn't get any signals that it doesn't have a handler for. But that means that we just return to userland and generate the same exception again immediately. With this patch we print a message and kill init in this situation. This is very useful when you have a bug in the kernel that means that init doesn't get as far as executing its first instruction. :) Without this patch the system hangs when it gets to starting the userland init; with it you at least get a message giving you a clue about what has gone wrong. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/ppc/mm')
-rw-r--r--arch/ppc/mm/fault.c6
1 files changed, 1 insertions, 5 deletions
diff --git a/arch/ppc/mm/fault.c b/arch/ppc/mm/fault.c
index 57d9930843ac..ee5e9f25baf9 100644
--- a/arch/ppc/mm/fault.c
+++ b/arch/ppc/mm/fault.c
@@ -278,11 +278,7 @@ bad_area:
/* User mode accesses cause a SIGSEGV */
if (user_mode(regs)) {
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- info.si_code = code;
- info.si_addr = (void __user *) address;
- force_sig_info(SIGSEGV, &info, current);
+ _exception(SIGSEGV, regs, code, address);
return 0;
}