From 723820f3f77dc9f7ffdceb076ebcf6a5b91d0a27 Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Sat, 9 Apr 2022 19:17:26 +0200 Subject: mm: Allow arch specific arch_randomize_brk() with CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT Commit e7142bf5d231 ("arm64, mm: make randomization selected by generic topdown mmap layout") introduced a default version of arch_randomize_brk() provided when CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT is selected. powerpc could select CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT but needs to provide its own arch_randomize_brk(). In order to allow that, define generic version of arch_randomize_brk() as a __weak symbol. Signed-off-by: Christophe Leroy Acked-by: Andrew Morton Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/b222f1ca06c850daf1b2f26afdb46c6dd97d21ba.1649523076.git.christophe.leroy@csgroup.eu --- mm/util.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'mm/util.c') diff --git a/mm/util.c b/mm/util.c index 3492a9e81aa3..44fbf211312d 100644 --- a/mm/util.c +++ b/mm/util.c @@ -344,7 +344,7 @@ unsigned long randomize_stack_top(unsigned long stack_top) } #ifdef CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT -unsigned long arch_randomize_brk(struct mm_struct *mm) +unsigned long __weak arch_randomize_brk(struct mm_struct *mm) { /* Is the current task 32bit ? */ if (!IS_ENABLED(CONFIG_64BIT) || is_compat_task()) -- cgit v1.2.3