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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2020-05-19 05:48:46 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-20 23:41:02 +1000 |
| commit | 7c31c05e00fc5ff2067332c5f80e525573e7269c (patch) | |
| tree | fffb715abe96ed006cb42fa43f12555c16b910b3 /arch/powerpc/mm/kasan | |
| parent | d2a91cef9bbdeb87b7449fdab1a6be6000930210 (diff) | |
| download | linux-7c31c05e00fc5ff2067332c5f80e525573e7269c.tar.gz linux-7c31c05e00fc5ff2067332c5f80e525573e7269c.tar.bz2 linux-7c31c05e00fc5ff2067332c5f80e525573e7269c.zip | |
powerpc/kasan: Remove unnecessary page table locking
Commit 45ff3c559585 ("powerpc/kasan: Fix parallel loading of
modules.") added spinlocks to manage parallele module loading.
Since then commit 47febbeeec44 ("powerpc/32: Force KASAN_VMALLOC for
modules") converted the module loading to KASAN_VMALLOC.
The spinlocking has then become unneeded and can be removed to
simplify kasan_init_shadow_page_tables()
Also remove inclusion of linux/moduleloader.h and linux/vmalloc.h
which are not needed anymore since the removal of modules management.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/81a4d3aee8b82bc1355595935c8f4ad9d3b22a83.1589866984.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/mm/kasan')
| -rw-r--r-- | arch/powerpc/mm/kasan/kasan_init_32.c | 19 |
1 files changed, 4 insertions, 15 deletions
diff --git a/arch/powerpc/mm/kasan/kasan_init_32.c b/arch/powerpc/mm/kasan/kasan_init_32.c index b7c287adfd59..91e2ade75192 100644 --- a/arch/powerpc/mm/kasan/kasan_init_32.c +++ b/arch/powerpc/mm/kasan/kasan_init_32.c @@ -5,9 +5,7 @@ #include <linux/kasan.h> #include <linux/printk.h> #include <linux/memblock.h> -#include <linux/moduleloader.h> #include <linux/sched/task.h> -#include <linux/vmalloc.h> #include <asm/pgalloc.h> #include <asm/code-patching.h> #include <mm/mmu_decl.h> @@ -34,31 +32,22 @@ static int __init kasan_init_shadow_page_tables(unsigned long k_start, unsigned { pmd_t *pmd; unsigned long k_cur, k_next; - pte_t *new = NULL; pmd = pmd_ptr_k(k_start); for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd++) { + pte_t *new; + k_next = pgd_addr_end(k_cur, k_end); if ((void *)pmd_page_vaddr(*pmd) != kasan_early_shadow_pte) continue; - if (!new) - new = memblock_alloc(PTE_FRAG_SIZE, PTE_FRAG_SIZE); + new = memblock_alloc(PTE_FRAG_SIZE, PTE_FRAG_SIZE); if (!new) return -ENOMEM; kasan_populate_pte(new, PAGE_KERNEL); - - smp_wmb(); /* See comment in __pte_alloc */ - - spin_lock(&init_mm.page_table_lock); - /* Has another populated it ? */ - if (likely((void *)pmd_page_vaddr(*pmd) == kasan_early_shadow_pte)) { - pmd_populate_kernel(&init_mm, pmd, new); - new = NULL; - } - spin_unlock(&init_mm.page_table_lock); + pmd_populate_kernel(&init_mm, pmd, new); } return 0; } |