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[173.79.56.208]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6cb254ead6fsm4583356d6.26.2024.09.25.08.25.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Sep 2024 08:25:15 -0700 (PDT) From: Gregory Price To: linux-acpi@vger.kernel.org, x86@kernel.org Cc: linux-kernel@vger.kernel.org, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, rafael@kernel.org, lenb@kernel.org, dan.j.williams@intel.com, alison.schofield@intel.com, Jonathan.Cameron@huawei.com, rrichter@amd.com, ytcoode@gmail.com, gourry@gourry.net, dave.jiang@intel.com, haibo1.xu@intel.com Subject: [RFC PATCH 1/2] x86/mm: if memblock size is adjusted, update the cached value Date: Wed, 25 Sep 2024 00:52:41 -0400 Message-ID: <20240925045242.3735-1-gourry@gourry.net> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 When parsing CFMWS, we need to know the current block size expected to avoid accidentally adjusting the size upward. This causes a value to be cached in a static global. Update the static global if the value is subsequently updated. Print a warning that this has occurred for debugging purposes if blocksize is changed at an unexpected time. Signed-off-by: Gregory Price --- arch/x86/mm/init_64.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index ff253648706f..0db7ce11e5c5 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1424,6 +1424,7 @@ void mark_rodata_ro(void) /* Adjustable memory block size */ static unsigned long set_memory_block_size; +static unsigned long memory_block_size_probed; int __init set_memory_block_size_order(unsigned int order) { unsigned long size = 1UL << order; @@ -1432,6 +1433,19 @@ int __init set_memory_block_size_order(unsigned int order) return -EINVAL; set_memory_block_size = size; + + /* + * If the block size has already been probed, we need to change it. + * This can happen during ACPI/CFMWS parsing, since it needs to + * probe the system for the existing block size to avoid increasing + * the block size if lower memory happens to be misaligned + */ + if (memory_block_size_probed) { + memory_block_size_probed = size; + pr_warn("x86/mm: Memory block size changed: %ldMB\n", + size >> 20); + } + return 0; } @@ -1471,7 +1485,6 @@ static unsigned long probe_memory_block_size(void) return bz; } -static unsigned long memory_block_size_probed; unsigned long memory_block_size_bytes(void) { if (!memory_block_size_probed)