From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
alex@ghiti.fr
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-mm@kvack.org
Subject: [PATCH v2 rebased 6/9] mm: Allow arch specific arch_randomize_brk() with CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
Date: Thu, 25 Nov 2021 18:52:55 +0100 [thread overview]
Message-ID: <e500ba42c80104f67413bcf266a444187ee796fb.1637862579.git.christophe.leroy@csgroup.eu> (raw)
In-Reply-To: <cover.1637862579.git.christophe.leroy@csgroup.eu>
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>
---
v2: Make the generic version of it a __weak symbol instead of a messy play with CONFIG_ items.
---
mm/util.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/util.c b/mm/util.c
index e58151a61255..7eb69f697b38 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())
--
2.33.1
next prev parent reply other threads:[~2021-11-25 17:57 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-25 17:52 [PATCH v2 rebased 0/9] Convert powerpc to default topdown mmap layout Christophe Leroy
2021-11-25 17:52 ` [PATCH v2 rebased 1/9] powerpc/mm: Make slice specific to book3s/64 Christophe Leroy
2021-12-01 5:32 ` Nicholas Piggin
2021-11-25 17:52 ` [PATCH v2 rebased 2/9] powerpc/mm: Move vma_mmu_pagesize() and hugetlb_get_unmapped_area() to slice.c Christophe Leroy
2021-12-01 5:43 ` Nicholas Piggin
2021-11-25 17:52 ` [PATCH v2 rebased 3/9] powerpc/mm: Remove CONFIG_PPC_MM_SLICES Christophe Leroy
2021-12-01 5:50 ` Nicholas Piggin
2021-11-25 17:52 ` [PATCH v2 rebased 4/9] powerpc/mm: Remove asm/slice.h Christophe Leroy
2021-12-01 5:51 ` Nicholas Piggin
2021-11-25 17:52 ` [PATCH v2 rebased 5/9] powerpc/mm: Call radix__arch_get_unmapped_area() from arch_get_unmapped_area() Christophe Leroy
2021-12-01 6:00 ` Nicholas Piggin
2021-11-25 17:52 ` Christophe Leroy [this message]
2021-11-25 17:52 ` [PATCH v2 rebased 7/9] powerpc/mm: Convert to default topdown mmap layout Christophe Leroy
2021-12-01 6:06 ` Nicholas Piggin
2021-11-25 17:52 ` [PATCH v2 rebased 8/9] powerpc/mm: Properly randomise mmap with slices Christophe Leroy
2021-11-25 17:52 ` [PATCH v2 rebased 9/9] powerpc: Simplify and move arch_randomize_brk() Christophe Leroy
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