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parisc: Enhance page fault termination message

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In debugging kernel panics, I believe it is useful to know what type
of page fault caused the termination. "Bad Address" is too vague.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
John David Anglin
2022-01-04 21:40:02 +00:00
committed by Helge Deller
parent 9d90a90855
commit 20dda87bdc
1 changed files with 10 additions and 4 deletions
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12
arch/parisc/mm/fault.c
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@@ -266,11 +266,14 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
unsigned long acc_type; unsigned long acc_type;
vm_fault_t fault = 0; vm_fault_t fault = 0;
unsigned int flags; unsigned int flags;
char *msg;
tsk = current; tsk = current;
mm = tsk->mm; mm = tsk->mm;
if (!mm) if (!mm) {
msg = "Page fault: no context";
goto no_context; goto no_context;
}
flags = FAULT_FLAG_DEFAULT; flags = FAULT_FLAG_DEFAULT;
if (user_mode(regs)) if (user_mode(regs))
@@ -406,6 +409,7 @@ bad_area:
force_sig_fault(signo, si_code, (void __user *) address); force_sig_fault(signo, si_code, (void __user *) address);
return; return;
} }
msg = "Page fault: bad address";
no_context: no_context:
@@ -413,11 +417,13 @@ no_context:
return; return;
} }
parisc_terminate("Bad Address (null pointer deref?)", regs, code, address); parisc_terminate(msg, regs, code, address);
out_of_memory: out_of_memory:
mmap_read_unlock(mm); mmap_read_unlock(mm);
if (!user_mode(regs)) if (!user_mode(regs)) {
msg = "Page fault: out of memory";
goto no_context; goto no_context;
}
pagefault_out_of_memory(); pagefault_out_of_memory();
} }