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Commit e2b85f70 authored by Florian Fainelli's avatar Florian Fainelli Committed by Russell King
Browse files

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: default avatarAndrew Lunn <andrew@lunn.ch>
Suggested-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
parent b99afae1

arch/arm/mm/fault.c

+6 −0
Original line number Diff line number Diff line
@@ -173,6 +173,12 @@ __do_user_fault(struct task_struct *tsk, unsigned long addr, 
		show_regs(regs);

	}

#endif

#ifndef CONFIG_KUSER_HELPERS

	if ((sig == SIGSEGV) && ((addr & PAGE_MASK) == 0xffff0000))

		printk_ratelimited(KERN_DEBUG

				   "%s: CONFIG_KUSER_HELPERS disabled at 0x%08lx\n",

				   tsk->comm, addr);

#endif



	tsk->thread.address = addr;

	tsk->thread.error_code = fsr;