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powerpc/mm: Limit resize_hpt_for_hotplug() call to hash guests only

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During memory hotplug and unplug, resize_hpt_for_hotplug() gets called
for both hash and radix guests but it should be called only for hash
guests. Though the call does nothing in the radix guest case, it is
cleaner to push this call into hash specific memory hotplug routines.

Reported-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200727095704.1432916-1-bharata@linux.ibm.com
This commit is contained in:
Bharata B Rao 2020-07-27 15:27:04 +05:30 committed by Michael Ellerman
parent 73da08f696
commit 55548a86eb
3 changed files with 7 additions and 12 deletions
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6
arch/powerpc/include/asm/sparsemem.h
View File

@ -17,12 +17,6 @@ extern int create_section_mapping(unsigned long start, unsigned long end,
int nid, pgprot_t prot);
extern int remove_section_mapping(unsigned long start, unsigned long end);
#ifdef CONFIG_PPC_BOOK3S_64
extern int resize_hpt_for_hotplug(unsigned long new_mem_size);
#else
static inline int resize_hpt_for_hotplug(unsigned long new_mem_size) { return 0; }
#endif
#ifdef CONFIG_NUMA
extern int hot_add_scn_to_nid(unsigned long scn_addr);
#else

8
arch/powerpc/mm/book3s64/hash_utils.c
View File

@ -785,7 +785,7 @@ static unsigned long __init htab_get_table_size(void)
}
#ifdef CONFIG_MEMORY_HOTPLUG
int resize_hpt_for_hotplug(unsigned long new_mem_size)
static int resize_hpt_for_hotplug(unsigned long new_mem_size)
{
unsigned target_hpt_shift;
@ -819,6 +819,8 @@ int hash__create_section_mapping(unsigned long start, unsigned long end,
return -1;
}
resize_hpt_for_hotplug(memblock_phys_mem_size());
rc = htab_bolt_mapping(start, end, __pa(start),
pgprot_val(prot), mmu_linear_psize,
mmu_kernel_ssize);
@ -836,6 +838,10 @@ int hash__remove_section_mapping(unsigned long start, unsigned long end)
int rc = htab_remove_mapping(start, end, mmu_linear_psize,
mmu_kernel_ssize);
WARN_ON(rc < 0);
if (resize_hpt_for_hotplug(memblock_phys_mem_size()) == -ENOSPC)
pr_warn("Hash collision while resizing HPT\n");
return rc;
}
#endif /* CONFIG_MEMORY_HOTPLUG */

5
arch/powerpc/mm/mem.c
View File

@ -127,8 +127,6 @@ int __ref arch_add_memory(int nid, u64 start, u64 size,
unsigned long nr_pages = size >> PAGE_SHIFT;
int rc;
resize_hpt_for_hotplug(memblock_phys_mem_size());
start = (unsigned long)__va(start);
rc = create_section_mapping(start, start + size, nid,
params->pgprot);
@ -161,9 +159,6 @@ void __ref arch_remove_memory(int nid, u64 start, u64 size,
* hit that section of memory
*/
vm_unmap_aliases();
if (resize_hpt_for_hotplug(memblock_phys_mem_size()) == -ENOSPC)
pr_warn("Hash collision while resizing HPT\n");
}
#endif