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[v10,02/13] mm: Allow arch specific arch_randomize_brk() with CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT

Message ID b222f1ca06c850daf1b2f26afdb46c6dd97d21ba.1649523076.git.christophe.leroy@csgroup.eu (mailing list archive)
State New
Headers show
Series Convert powerpc to default topdown mmap layout (v10) | expand

Commit Message

Christophe Leroy April 9, 2022, 5:17 p.m. UTC 
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.

Cc: Alexandre Ghiti <alex@ghiti.fr>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/mm/util.c b/mm/util.c
index 54e5e761a9a9..0787fe4af4ac 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())