diff options
| -rw-r--r-- | arch/arm64/kernel/probes/uprobes.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm64/kernel/probes/uprobes.c b/arch/arm64/kernel/probes/uprobes.c index d49aef2657cd..ba61651db4b5 100644 --- a/arch/arm64/kernel/probes/uprobes.c +++ b/arch/arm64/kernel/probes/uprobes.c @@ -17,12 +17,20 @@ void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr, void *xol_page_kaddr = kmap_atomic(page); void *dst = xol_page_kaddr + (vaddr & ~PAGE_MASK); + /* + * Initial cache maintenance of the xol page done via set_pte_at(). + * Subsequent CMOs only needed if the xol slot changes. + */ + if (!memcmp(dst, src, len)) + goto done; + /* Initialize the slot */ memcpy(dst, src, len); /* flush caches (dcache/icache) */ sync_icache_aliases((unsigned long)dst, (unsigned long)dst + len); +done: kunmap_atomic(xol_page_kaddr); } |