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Date: Mon, 19 Aug 2013 12:48:00 -0600 From: Toshi Kani <toshi.kani@...com> To: Tang Chen <tangchen@...fujitsu.com> Cc: tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, lenb@...nel.org, rjw@...k.pl, liwanp@...ux.vnet.ibm.com, tj@...nel.org, akpm@...ux-foundation.org, x86@...nel.org, linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org Subject: Re: [PATCH 1/6] acpi, numa, mem_hotplug: Kill save_add_info(). On Fri, 2013-08-16 at 15:06 +0800, Tang Chen wrote: > save_add_info() is defined as: > > #ifdef CONFIG_MEMORY_HOTPLUG > static inline int save_add_info(void) {return 1;} > #else > static inline int save_add_info(void) {return 0;} > #endif > > which means it is true when memory hotplug is configured. > > In acpi_numa_memory_affinity_init(), it checks the memory hotplug > flag in SRAT memory affinity and save_add_info() like this: > > if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && !save_add_info()) > goto out_err; > ...... > node = setup_node(pxm); > numa_add_memblk(node, start, end); > ...... > > which means if the memory range is hotpluggable, but memory hotplug is not > configured, it won't add these memory to numa_meminfo. > > After this, numa_meminfo_cover_memory() will fail, which will finally cause > numa_init() to fail. > > numa_init() > |->numa_register_memblks() > |->numa_meminfo_cover_memory() > > When numa_init() fails, it will fallback to numa_init(dummy_numa_init), and > all numa architecture will not be setup. > > This is nonsense. Even if memory hotplug is not configured, we can also use > numa architecture. > > Actually, save_add_info() is added by commit 71efa8fdc55e70ec6687c897a30759f0a2c2ad7e > in 2006. And now it is useless. > > So this patch kill save_add_info() and the nonsense checking. > > Signed-off-by: Tang Chen <tangchen@...fujitsu.com> Good catch! Acked-by: Toshi Kani <toshi.kani@...com> Thanks, -Toshi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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