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ARM: 8807/1: mm: Facilitate debugging CONFIG_KUSER_HELPERS disabled
Some software such as perf makes unconditional use of the special [vectors] page which is only provided when CONFIG_KUSER_HELPERS is enabled in the kernel. Facilitate the debugging of such situations by printing a debug message to the kernel log showing the task name and the faulting address. Reviewed-by: Andrew Lunn <andrew@lunn.ch> Suggested-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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1 changed files with 6 additions and 0 deletions
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@ -173,6 +173,12 @@ __do_user_fault(struct task_struct *tsk, unsigned long addr,
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show_regs(regs);
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show_regs(regs);
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}
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}
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#endif
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#endif
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#ifndef CONFIG_KUSER_HELPERS
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if ((sig == SIGSEGV) && ((addr & PAGE_MASK) == 0xffff0000))
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printk_ratelimited(KERN_DEBUG
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"%s: CONFIG_KUSER_HELPERS disabled at 0x%08lx\n",
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tsk->comm, addr);
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#endif
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tsk->thread.address = addr;
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tsk->thread.address = addr;
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tsk->thread.error_code = fsr;
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tsk->thread.error_code = fsr;
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