diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2019-04-17 18:33:51 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-04-21 23:12:39 +1000 |
| commit | ef629cc5bf0543eb57d6e344ba776880ac35fd00 (patch) | |
| tree | 3713d40f241169a87dae20faae74ee4e744701ca /arch/powerpc/mm/mmu_context_book3s64.c | |
| parent | 701101865f5d3e268281ce7a254eb4a97d16cbdc (diff) | |
powerc/mm/hash: Reduce hash_mm_context size
Allocate subpage protect related variables only if we use the feature.
This helps in reducing the hash related mm context struct by around 4K
Before the patch
sizeof(struct hash_mm_context) = 8288
After the patch
sizeof(struct hash_mm_context) = 4160
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/mmu_context_book3s64.c')
| -rw-r--r-- | arch/powerpc/mm/mmu_context_book3s64.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/arch/powerpc/mm/mmu_context_book3s64.c b/arch/powerpc/mm/mmu_context_book3s64.c index 6eef5a36b2e9..cb2b08635508 100644 --- a/arch/powerpc/mm/mmu_context_book3s64.c +++ b/arch/powerpc/mm/mmu_context_book3s64.c @@ -63,7 +63,8 @@ static int hash__init_new_context(struct mm_struct *mm) if (index < 0) return index; - mm->context.hash_context = kmalloc(sizeof(struct hash_mm_context), GFP_KERNEL); + mm->context.hash_context = kmalloc(sizeof(struct hash_mm_context), + GFP_KERNEL); if (!mm->context.hash_context) { ida_free(&mmu_context_ida, index); return -ENOMEM; @@ -89,11 +90,21 @@ static int hash__init_new_context(struct mm_struct *mm) } else { /* This is fork. Copy hash_context details from current->mm */ memcpy(mm->context.hash_context, current->mm->context.hash_context, sizeof(struct hash_mm_context)); +#ifdef CONFIG_PPC_SUBPAGE_PROT + /* inherit subpage prot detalis if we have one. */ + if (current->mm->context.hash_context->spt) { + mm->context.hash_context->spt = kmalloc(sizeof(struct subpage_prot_table), + GFP_KERNEL); + if (!mm->context.hash_context->spt) { + ida_free(&mmu_context_ida, index); + kfree(mm->context.hash_context); + return -ENOMEM; + } + } +#endif } - subpage_prot_init_new_context(mm); - pkey_mm_init(mm); return index; } |