From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (bilbo.ozlabs.org [103.22.144.67]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 404YVz64jXzF1Vp for ; Mon, 19 Mar 2018 22:19:39 +1100 (AEDT) From: Michael Ellerman To: Jonathan =?utf-8?Q?Neusch=C3=A4fer?= , linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org, Jonathan =?utf-8?Q?Neusch=C3=A4fer?= , linux-mm@kvack.org, Paul Mackerras , Joel Stanley , Guenter Roeck Subject: Re: [PATCH 3/5] powerpc/mm/32: Use page_is_ram to check for RAM In-Reply-To: <874llcha6p.fsf@concordia.ellerman.id.au> References: <20180222121516.23415-1-j.neuschaefer@gmx.net> <20180222121516.23415-4-j.neuschaefer@gmx.net> <874llcha6p.fsf@concordia.ellerman.id.au> Date: Mon, 19 Mar 2018 22:19:32 +1100 Message-ID: <87y3iofh2z.fsf@concordia.ellerman.id.au> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Michael Ellerman writes: > Jonathan Neusch=C3=A4fer writes: > >> Signed-off-by: Jonathan Neusch=C3=A4fer >> --- >> arch/powerpc/mm/pgtable_32.c | 3 +-- >> 1 file changed, 1 insertion(+), 2 deletions(-) >> >> diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c >> index d35d9ad3c1cd..d54e1a9c1c99 100644 >> --- a/arch/powerpc/mm/pgtable_32.c >> +++ b/arch/powerpc/mm/pgtable_32.c >> @@ -145,9 +145,8 @@ __ioremap_caller(phys_addr_t addr, unsigned long siz= e, unsigned long flags, >> #ifndef CONFIG_CRASH_DUMP >> /* >> * Don't allow anybody to remap normal RAM that we're using. >> - * mem_init() sets high_memory so only do the check after that. >> */ >> - if (slab_is_available() && (p < virt_to_phys(high_memory)) && >> + if (page_is_ram(__phys_to_pfn(p)) && >> !(__allow_ioremap_reserved && memblock_is_region_reserved(p, size)= )) { >> printk("__ioremap(): phys addr 0x%llx is RAM lr %ps\n", >> (unsigned long long)p, __builtin_return_address(0)); > > > This is killing my p5020ds (Freescale e5500) unfortunately: Duh, I should actually read the patch :) This is a 32-bit system with 4G of RAM, so not all of RAM is mapped, some of it is highem which is why removing the test against high_memory above breaks it. So I need the high_memory test on this system. I'm not clear why it was a problem for you on the Wii, do you even build the Wii kernel with HIGHMEM enabled? cheers