From mboxrd@z Thu Jan 1 00:00:00 1970 From: geert@linux-m68k.org (Geert Uytterhoeven) Date: Thu, 24 Apr 2014 09:18:25 +0200 Subject: [PATCH 08/28] nios2: MMU Fault handling In-Reply-To: <20140422143036.GD15745@arch.cereza> References: <1397824031-4892-1-git-send-email-lftan@altera.com> <1397824031-4892-6-git-send-email-lftan@altera.com> <20140422143036.GD15745@arch.cereza> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tue, Apr 22, 2014 at 4:30 PM, Ezequiel Garcia wrote: > On Apr 18, Ley Foon Tan wrote: >> + >> +bad_area_nosemaphore: >> + /* User mode accesses just cause a SIGSEGV */ >> + if (user_mode(regs)) { > > I found that it's useful to add some printing here, just as ARM > does. I carry this patch on my kernel: > > + printk(KERN_INFO "%s: unhandled page fault (%d) at 0x%08lx, cause %ld\n", > + current->comm, SIGSEGV, address, cause); > + show_regs(regs); > > Do you think we could do something like it? Maybe with a compile time option? Can this easily be triggered from userspace? If yes, please use pr_info_ratelimited(). Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds