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Date: Sat, 12 Feb 2011 10:39:03 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Tejun Heo <tj@...nel.org>
CC: linux-kernel@...r.kernel.org, x86@...nel.org, brgerst@...il.com,
gorcunov@...il.com, shaohui.zheng@...el.com, rientjes@...gle.com,
mingo@...e.hu, hpa@...ux.intel.com
Subject: Re: [PATCH 04/26] x86-64, NUMA: Unify {acpi|amd}_{numa_init|scan_nodes}()
arguments and return values
On 02/12/2011 09:10 AM, Tejun Heo wrote:
> The functions used during NUMA initialization - *_numa_init() and
> *_scan_nodes() - have different arguments and return values. Unify
> them such that they all take no argument and return 0 on success and
> -errno on failure. This is in preparation for further NUMA init
> cleanups.
>
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Yinghai Lu <yinghai@...nel.org>
> Cc: Brian Gerst <brgerst@...il.com>
> Cc: Cyrill Gorcunov <gorcunov@...il.com>
> Cc: Shaohui Zheng <shaohui.zheng@...el.com>
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: H. Peter Anvin <hpa@...ux.intel.com>
> ---
> arch/x86/include/asm/acpi.h | 2 +-
> arch/x86/include/asm/amd_nb.h | 2 +-
> arch/x86/kernel/setup.c | 4 ++--
> arch/x86/mm/amdtopology_64.c | 18 +++++++++---------
> arch/x86/mm/numa_64.c | 2 +-
> arch/x86/mm/srat_64.c | 4 ++--
> drivers/acpi/numa.c | 9 ++++++---
> 7 files changed, 22 insertions(+), 19 deletions(-)
>
> diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
> index 211ca3f..4e5dff9 100644
> --- a/arch/x86/include/asm/acpi.h
> +++ b/arch/x86/include/asm/acpi.h
> @@ -187,7 +187,7 @@ struct bootnode;
> extern int acpi_numa;
> extern void acpi_get_nodes(struct bootnode *physnodes, unsigned long start,
> unsigned long end);
> -extern int acpi_scan_nodes(unsigned long start, unsigned long end);
> +extern int acpi_scan_nodes(void);
> #define NR_NODE_MEMBLKS (MAX_NUMNODES*2)
>
> #ifdef CONFIG_NUMA_EMU
> diff --git a/arch/x86/include/asm/amd_nb.h b/arch/x86/include/asm/amd_nb.h
> index 64dc82e..72abf65 100644
> --- a/arch/x86/include/asm/amd_nb.h
> +++ b/arch/x86/include/asm/amd_nb.h
> @@ -16,7 +16,7 @@ struct bootnode;
> extern int early_is_amd_nb(u32 value);
> extern int amd_cache_northbridges(void);
> extern void amd_flush_garts(void);
> -extern int amd_numa_init(unsigned long start_pfn, unsigned long end_pfn);
> +extern int amd_numa_init(void);
> extern int amd_scan_nodes(void);
>
> #ifdef CONFIG_NUMA_EMU
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index c50ba3d..1870a59 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -988,12 +988,12 @@ void __init setup_arch(char **cmdline_p)
> /*
> * Parse SRAT to discover nodes.
> */
> - acpi = acpi_numa_init();
> + acpi = !acpi_numa_init();
> #endif
>
> #ifdef CONFIG_AMD_NUMA
> if (!acpi)
> - amd = !amd_numa_init(0, max_pfn);
> + amd = !amd_numa_init();
> #endif
>
> initmem_init(acpi, amd);
> diff --git a/arch/x86/mm/amdtopology_64.c b/arch/x86/mm/amdtopology_64.c
> index c7fae38..ee70257 100644
> --- a/arch/x86/mm/amdtopology_64.c
> +++ b/arch/x86/mm/amdtopology_64.c
> @@ -51,7 +51,7 @@ static __init int find_northbridge(void)
> return num;
> }
>
> - return -1;
> + return -ENOENT;
> }
>
> static __init void early_get_boot_cpu_id(void)
> @@ -69,17 +69,17 @@ static __init void early_get_boot_cpu_id(void)
> #endif
> }
>
> -int __init amd_numa_init(unsigned long start_pfn, unsigned long end_pfn)
> +int __init amd_numa_init(void)
> {
> - unsigned long start = PFN_PHYS(start_pfn);
> - unsigned long end = PFN_PHYS(end_pfn);
> + unsigned long start = PFN_PHYS(0);
> + unsigned long end = PFN_PHYS(max_pfn);
> unsigned numnodes;
> unsigned long prevbase;
> int i, nb, found = 0;
> u32 nodeid, reg;
>
> if (!early_pci_allowed())
> - return -1;
> + return -EINVAL;
>
> nb = find_northbridge();
> if (nb < 0)
> @@ -90,7 +90,7 @@ int __init amd_numa_init(unsigned long start_pfn, unsigned long end_pfn)
> reg = read_pci_config(0, nb, 0, 0x60);
> numnodes = ((reg >> 4) & 0xF) + 1;
> if (numnodes <= 1)
> - return -1;
> + return -ENOENT;
>
> pr_info("Number of physical nodes %d\n", numnodes);
>
> @@ -121,7 +121,7 @@ int __init amd_numa_init(unsigned long start_pfn, unsigned long end_pfn)
> if ((base >> 8) & 3 || (limit >> 8) & 3) {
> pr_err("Node %d using interleaving mode %lx/%lx\n",
> nodeid, (base >> 8) & 3, (limit >> 8) & 3);
> - return -1;
> + return -EINVAL;
> }
> if (node_isset(nodeid, nodes_parsed)) {
> pr_info("Node %d already present, skipping\n",
> @@ -160,7 +160,7 @@ int __init amd_numa_init(unsigned long start_pfn, unsigned long end_pfn)
> if (prevbase > base) {
> pr_err("Node map not sorted %lx,%lx\n",
> prevbase, base);
> - return -1;
> + return -EINVAL;
> }
>
> pr_info("Node %d MemBase %016lx Limit %016lx\n",
> @@ -177,7 +177,7 @@ int __init amd_numa_init(unsigned long start_pfn, unsigned long end_pfn)
> }
>
> if (!found)
> - return -1;
> + return -ENOENT;
> return 0;
> }
>
> diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
> index f534feb..85561d1 100644
> --- a/arch/x86/mm/numa_64.c
> +++ b/arch/x86/mm/numa_64.c
> @@ -595,7 +595,7 @@ void __init initmem_init(int acpi, int amd)
> #endif
>
> #ifdef CONFIG_ACPI_NUMA
> - if (!numa_off && acpi && !acpi_scan_nodes(0, max_pfn << PAGE_SHIFT))
> + if (!numa_off && acpi && !acpi_scan_nodes())
> return;
> nodes_clear(node_possible_map);
> nodes_clear(node_online_map);
> diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
> index e3e0dd3..19652dd 100644
> --- a/arch/x86/mm/srat_64.c
> +++ b/arch/x86/mm/srat_64.c
> @@ -359,7 +359,7 @@ void __init acpi_get_nodes(struct bootnode *physnodes, unsigned long start,
> #endif /* CONFIG_NUMA_EMU */
>
> /* Use the information discovered above to actually set up the nodes. */
> -int __init acpi_scan_nodes(unsigned long start, unsigned long end)
> +int __init acpi_scan_nodes(void)
> {
> int i;
>
> @@ -368,7 +368,7 @@ int __init acpi_scan_nodes(unsigned long start, unsigned long end)
>
> /* First clean up the node list */
> for (i = 0; i < MAX_NUMNODES; i++)
> - cutoff_node(i, start, end);
> + cutoff_node(i, 0, max_pfn << PAGE_SHIFT);
>
> /*
> * Join together blocks on the same node, holes between
> diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
> index 5eb25eb..3b5c318 100644
> --- a/drivers/acpi/numa.c
> +++ b/drivers/acpi/numa.c
> @@ -274,7 +274,7 @@ acpi_table_parse_srat(enum acpi_srat_type id,
>
> int __init acpi_numa_init(void)
> {
> - int ret = 0;
> + int cnt = 0;
>
> /*
> * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
> @@ -288,7 +288,7 @@ int __init acpi_numa_init(void)
> acpi_parse_x2apic_affinity, 0);
> acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
> acpi_parse_processor_affinity, 0);
> - ret = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
> + cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
> acpi_parse_memory_affinity,
> NR_NODE_MEMBLKS);
> }
> @@ -297,7 +297,10 @@ int __init acpi_numa_init(void)
> acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
>
> acpi_numa_arch_fixup();
> - return ret;
> +
> + if (cnt <= 0)
> + return cnt ?: -ENOENT;
> + return 0;
> }
>
> int acpi_get_pxm(acpi_handle h)
it will break AMD system that does not have SRAT.
your change will treat NO_SRAT as SRAT is there.
Yinghai
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