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Mon, 28 Aug 2023 07:47:05 +0000 (GMT) Received: from smtpav02.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A8D6058058; Mon, 28 Aug 2023 07:47:02 +0000 (GMT) Received: from skywalker.in.ibm.com (unknown [9.109.212.144]) by smtpav02.wdc07v.mail.ibm.com (Postfix) with ESMTP; Mon, 28 Aug 2023 07:47:02 +0000 (GMT) From: "Aneesh Kumar K.V" To: linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu Subject: [PATCH 1/2] powerpc/mm/book3s64: Fix build error with SPARSEMEM disabled Date: Mon, 28 Aug 2023 13:16:57 +0530 Message-ID: <20230828074658.59553-1-aneesh.kumar@linux.ibm.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 0Fi78Wg98DZBe6cvz5rgH5dqLLosBTAK X-Proofpoint-ORIG-GUID: icOeA3AK0-aTIgT7T4GqRCPvk3keMe7h X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-08-28_04,2023-08-25_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1011 priorityscore=1501 malwarescore=0 phishscore=0 spamscore=0 adultscore=0 suspectscore=0 mlxscore=0 lowpriorityscore=0 bulkscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2308280068 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Aneesh Kumar K.V" , foraker1@llnl.gov, Reza Arbab Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" With CONFIG_SPARSEMEM disabled the below kernel build error is observed. arch/powerpc/mm/init_64.c:477:38: error: use of undeclared identifier 'SECTION_SIZE_BITS' CONFIG_MEMORY_HOTPLUG depends on CONFIG_SPARSEMEM and it is more clear to describe the code dependency in terms of MEMORY_HOTPLUG. Outside memory hotplug the kernel uses memory_block_size for kernel directmap. Instead of depending on SECTION_SIZE_BITS to compute the direct map page size, add a new #define which defaults to 16M(same as existing SECTION_SIZE) Fixes: 4d15721177d5 ("powerpc/mm: Cleanup memory block size probing") Signed-off-by: Aneesh Kumar K.V Reported-by: kernel test robot --- arch/powerpc/mm/init_64.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c index fcda46c2b8df..e3d7379ef480 100644 --- a/arch/powerpc/mm/init_64.c +++ b/arch/powerpc/mm/init_64.c @@ -472,12 +472,23 @@ static int __init dt_scan_mmu_pid_width(unsigned long node, return 1; } +/* + * Outside hotplug the kernel uses this value to map the kernel direct map + * with radix. To be compatible with older kernels, let's keep this value + * as 16M which is also SECTION_SIZE with SPARSEMEM. We can ideally map + * things with 1GB size in the case where we don't support hotplug. + */ +#ifndef CONFIG_MEMORY_HOTPLUG +#define DEFAULT_MEMORY_BLOCK_SIZE SZ_16M +#else +#define DEFAULT_MEMORY_BLOCK_SIZE MIN_MEMORY_BLOCK_SIZE +#endif + static void update_memory_block_size(unsigned long *block_size, unsigned long mem_size) { - unsigned long section_size = 1UL << SECTION_SIZE_BITS; - - for (; *block_size > section_size; *block_size >>= 2) { + unsigned long min_memory_block_size = DEFAULT_MEMORY_BLOCK_SIZE; + for (; *block_size > min_memory_block_size; *block_size >>= 2) { if ((mem_size & *block_size) == 0) break; } @@ -507,7 +518,7 @@ static int __init probe_memory_block_size(unsigned long node, const char *uname, /* * Nothing in the device tree */ - *block_size = MIN_MEMORY_BLOCK_SIZE; + *block_size = DEFAULT_MEMORY_BLOCK_SIZE; else *block_size = of_read_number(prop, dt_root_size_cells); /*