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Thu, 7 May 2020 20:09:01 +0000 (GMT) Received: from linux.ibm.com (unknown [9.148.201.211]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Thu, 7 May 2020 20:09:01 +0000 (GMT) Date: Thu, 7 May 2020 23:08:59 +0300 From: Mike Rapoport To: Russell King - ARM Linux admin Subject: [PATCH] arm: use SPARSMEM_STATIC when SPARSEMEM is enabled (Was: [PATCH 1/2] ARM: Remove redundant ARCH_SPARSEMEM_DEFAULT setting) Message-ID: <20200507200859.GF683243@linux.ibm.com> References: <20200506235009.25023-1-f.fainelli@gmail.com> <20200506235009.25023-2-f.fainelli@gmail.com> <20200507103039.GR1551@shell.armlinux.org.uk> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200507103039.GR1551@shell.armlinux.org.uk> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.676 definitions=2020-05-07_13:2020-05-07, 2020-05-07 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 phishscore=0 bulkscore=0 adultscore=0 malwarescore=0 spamscore=0 suspectscore=1 impostorscore=0 mlxscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005070159 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200507_130916_657771_3082BB0C X-CRM114-Status: GOOD ( 24.87 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Doug Berger , Arnd Bergmann , sboyd@kernel.org, Kevin Cernekee , Florian Fainelli , Gregory Fong , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, May 07, 2020 at 11:30:39AM +0100, Russell King - ARM Linux admin wrote: > On Wed, May 06, 2020 at 04:50:08PM -0700, Florian Fainelli wrote: > > From: Kevin Cernekee > > > > If ARCH_SPARSEMEM_ENABLE=y and ARCH_{FLATMEM,DISCONTIGMEM}_ENABLE=n, > > then the logic in mm/Kconfig already makes CONFIG_SPARSEMEM the only > > choice. This is true for all of the existing ARM users of > > ARCH_SPARSEMEM_ENABLE. > > > > Forcing ARCH_SPARSEMEM_DEFAULT=y if ARCH_SPARSEMEM_ENABLE=y prevents > > us from ever defaulting to FLATMEM, so we should remove this setting. > > No explanation why that is desirable. > > > -config ARCH_SPARSEMEM_DEFAULT > > - def_bool ARCH_SPARSEMEM_ENABLE > > - > > What this basically says is ARCH_SPARSEMEM_ENABLE=ARCH_SPARSEMEM_DEFAULT, > which is exactly what we want for the non-multiplatform boards that > select ARCH_SPARSEMEM_ENABLE - we _want_ them to default to sparsemem > because that is what the platform requires. > > For example, with RiscPC, which selects ARCH_SPARSEMEM_ENABLE, we have > four banks of memory at 0x10000000, 0x14000000, 0x18000000 and > 0x1c000000. These correspond with the two memory slots - the first two > for the first slot, and the second two for the second slot. Each slot > has two banks. The size of each memory bank depends on the size of the > module. Out of curiosity I've run make ARCH=arm rpc_defconfig grep SPARSEMEM .config and I was surprised to find out that it has CONFIG_SPARSEMEM_EXTREME=y Which would waste several kilibytes of memory for nothing. Here is the fix: >From 7097c114226b5b1b2fc6bb605bf0d7eae601cc7f Mon Sep 17 00:00:00 2001 From: Mike Rapoport Date: Thu, 7 May 2020 22:39:12 +0300 Subject: [PATCH] arm: use SPARSMEM_STATIC when SPARSEMEM is enabled The commit 3e347261a80b5 ("[PATCH] sparsemem extreme implementation") made SPARSMEM_EXTREME the default option for configurations that enable SPARSEMEM. For ARM systems with handful of memory banks SPARSEMEM_EXTREME is an overkill. Ensure that SPARSMEM_STATIC is enabled in the configurations that use SPARSEMEM. Fixes: 3e347261a80b5 ("[PATCH] sparsemem extreme implementation") Signed-off-by: Mike Rapoport --- arch/arm/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 66a04f6f4775..c88a48d622fc 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1517,6 +1517,7 @@ config ARCH_HAS_HOLES_MEMORYMODEL config ARCH_SPARSEMEM_ENABLE bool + select SPARSEMEM_STATIC config ARCH_SPARSEMEM_DEFAULT def_bool ARCH_SPARSEMEM_ENABLE -- 2.25.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel