[RFC perf/core 02/11] uprobes: Make copy_from_page global

[Jiri Olsa <jolsa@kernel.org>]

Making copy_from_page global and adding uprobe prefix.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 include/linux/uprobes.h |  1 +
 kernel/events/uprobes.c | 10 +++++-----
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 2f500bc97263..28068f9fcdc1 100644
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -213,6 +213,7 @@ extern void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr,
 extern void uprobe_handle_trampoline(struct pt_regs *regs);
 extern void *arch_uretprobe_trampoline(unsigned long *psize);
 extern unsigned long uprobe_get_trampoline_vaddr(void);
+extern void uprobe_copy_from_page(struct page *page, unsigned long vaddr, void *dst, int len);
 #else /* !CONFIG_UPROBES */
 struct uprobes_state {
 };
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 0b04c051d712..e9308649bba3 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -250,7 +250,7 @@ bool __weak is_trap_insn(uprobe_opcode_t *insn)
 	return is_swbp_insn(insn);
 }
 
-static void copy_from_page(struct page *page, unsigned long vaddr, void *dst, int len)
+void uprobe_copy_from_page(struct page *page, unsigned long vaddr, void *dst, int len)
 {
 	void *kaddr = kmap_atomic(page);
 	memcpy(dst, kaddr + (vaddr & ~PAGE_MASK), len);
@@ -278,7 +278,7 @@ static int verify_opcode(struct page *page, unsigned long vaddr, uprobe_opcode_t
 	 * is a trap variant; uprobes always wins over any other (gdb)
 	 * breakpoint.
 	 */
-	copy_from_page(page, vaddr, &old_opcode, UPROBE_SWBP_INSN_SIZE);
+	uprobe_copy_from_page(page, vaddr, &old_opcode, UPROBE_SWBP_INSN_SIZE);
 	is_swbp = is_swbp_insn(&old_opcode);
 
 	if (is_swbp_insn(new_opcode)) {
@@ -1027,7 +1027,7 @@ static int __copy_insn(struct address_space *mapping, struct file *filp,
 	if (IS_ERR(page))
 		return PTR_ERR(page);
 
-	copy_from_page(page, offset, insn, nbytes);
+	uprobe_copy_from_page(page, offset, insn, nbytes);
 	put_page(page);
 
 	return 0;
@@ -1368,7 +1368,7 @@ struct uprobe *uprobe_register(struct inode *inode,
 		return ERR_PTR(-EINVAL);
 
 	/*
-	 * This ensures that copy_from_page(), copy_to_page() and
+	 * This ensures that uprobe_copy_from_page(), copy_to_page() and
 	 * __update_ref_ctr() can't cross page boundary.
 	 */
 	if (!IS_ALIGNED(offset, UPROBE_SWBP_INSN_SIZE))
@@ -2288,7 +2288,7 @@ static int is_trap_at_addr(struct mm_struct *mm, unsigned long vaddr)
 	if (result < 0)
 		return result;
 
-	copy_from_page(page, vaddr, &opcode, UPROBE_SWBP_INSN_SIZE);
+	uprobe_copy_from_page(page, vaddr, &opcode, UPROBE_SWBP_INSN_SIZE);
 	put_page(page);
  out:
 	/* This needs to return true for any variant of the trap insn */
-- 
2.47.0