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Merge branch 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 debug updates from Ingo Molnar:
 "Various fixes to the NUMA emulation code"

* 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/numa_emulation: Recalculate numa_nodes_parsed from emulated nodes
  x86/numa_emulation: Assign physnode_mask directly from numa_nodes_parsed
  x86/numa_emulation: Refine the calculation of max_emu_nid and dfl_phys_nid
This commit is contained in:
Linus Torvalds 2017-09-04 11:10:30 -07:00
commit f29139bf10
1 changed files with 32 additions and 23 deletions
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55
arch/x86/mm/numa_emulation.c
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@ -75,13 +75,15 @@ static int __init emu_setup_memblk(struct numa_meminfo *ei,
/*
* Sets up nr_nodes fake nodes interleaved over physical nodes ranging from addr
* to max_addr. The return value is the number of nodes allocated.
* to max_addr.
*
* Returns zero on success or negative on error.
*/
static int __init split_nodes_interleave(struct numa_meminfo *ei,
struct numa_meminfo *pi,
u64 addr, u64 max_addr, int nr_nodes)
{
nodemask_t physnode_mask = NODE_MASK_NONE;
nodemask_t physnode_mask = numa_nodes_parsed;
u64 size;
int big;
int nid = 0;
@ -116,9 +118,6 @@ static int __init split_nodes_interleave(struct numa_meminfo *ei,
return -1;
}
for (i = 0; i < pi->nr_blks; i++)
node_set(pi->blk[i].nid, physnode_mask);
/*
* Continue to fill physical nodes with fake nodes until there is no
* memory left on any of them.
@ -200,13 +199,15 @@ static u64 __init find_end_of_node(u64 start, u64 max_addr, u64 size)
/*
* Sets up fake nodes of `size' interleaved over physical nodes ranging from
* `addr' to `max_addr'. The return value is the number of nodes allocated.
* `addr' to `max_addr'.
*
* Returns zero on success or negative on error.
*/
static int __init split_nodes_size_interleave(struct numa_meminfo *ei,
struct numa_meminfo *pi,
u64 addr, u64 max_addr, u64 size)
{
nodemask_t physnode_mask = NODE_MASK_NONE;
nodemask_t physnode_mask = numa_nodes_parsed;
u64 min_size;
int nid = 0;
int i, ret;
@ -231,9 +232,6 @@ static int __init split_nodes_size_interleave(struct numa_meminfo *ei,
}
size &= FAKE_NODE_MIN_HASH_MASK;
for (i = 0; i < pi->nr_blks; i++)
node_set(pi->blk[i].nid, physnode_mask);
/*
* Fill physical nodes with fake nodes of size until there is no memory
* left on any of them.
@ -280,6 +278,22 @@ static int __init split_nodes_size_interleave(struct numa_meminfo *ei,
return 0;
}
int __init setup_emu2phys_nid(int *dfl_phys_nid)
{
int i, max_emu_nid = 0;
*dfl_phys_nid = NUMA_NO_NODE;
for (i = 0; i < ARRAY_SIZE(emu_nid_to_phys); i++) {
if (emu_nid_to_phys[i] != NUMA_NO_NODE) {
max_emu_nid = i;
if (*dfl_phys_nid == NUMA_NO_NODE)
*dfl_phys_nid = emu_nid_to_phys[i];
}
}
return max_emu_nid;
}
/**
* numa_emulation - Emulate NUMA nodes
* @numa_meminfo: NUMA configuration to massage
@ -376,23 +390,18 @@ void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt)
* Determine the max emulated nid and the default phys nid to use
* for unmapped nodes.
*/
max_emu_nid = 0;
dfl_phys_nid = NUMA_NO_NODE;
for (i = 0; i < ARRAY_SIZE(emu_nid_to_phys); i++) {
if (emu_nid_to_phys[i] != NUMA_NO_NODE) {
max_emu_nid = i;
if (dfl_phys_nid == NUMA_NO_NODE)
dfl_phys_nid = emu_nid_to_phys[i];
}
}
if (dfl_phys_nid == NUMA_NO_NODE) {
pr_warning("NUMA: Warning: can't determine default physical node, disabling emulation\n");
goto no_emu;
}
max_emu_nid = setup_emu2phys_nid(&dfl_phys_nid);
/* commit */
*numa_meminfo = ei;
/* Make sure numa_nodes_parsed only contains emulated nodes */
nodes_clear(numa_nodes_parsed);
for (i = 0; i < ARRAY_SIZE(ei.blk); i++)
if (ei.blk[i].start != ei.blk[i].end &&
ei.blk[i].nid != NUMA_NO_NODE)
node_set(ei.blk[i].nid, numa_nodes_parsed);
/*
* Transform __apicid_to_node table to use emulated nids by
* reverse-mapping phys_nid. The maps should always exist but fall