From: Sami Tolvanen <samitolvanen@google.com>
To: Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Andrew Morton <akpm@linux-foundation.org>,
Kees Cook <keescook@chromium.org>
Cc: linux-mm@kvack.org, linux-riscv@lists.infradead.org,
llvm@lists.linux.dev, linux-kernel@vger.kernel.org,
Sami Tolvanen <samitolvanen@google.com>
Subject: [PATCH 1/2] mm: Change mmap_rnd_bits_max to __ro_after_init
Date: Fri, 29 Sep 2023 21:11:57 +0000 [thread overview]
Message-ID: <20230929211155.3910949-5-samitolvanen@google.com> (raw)
In-Reply-To: <20230929211155.3910949-4-samitolvanen@google.com>
Allow mmap_rnd_bits_max to be updated on architectures that
determine virtual address space size at runtime instead of relying
on Kconfig options by changing it from const to __ro_after_init.
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
---
include/linux/mm.h | 2 +-
mm/mmap.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index bf5d0b1b16f4..72a98b2afaf9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -86,7 +86,7 @@ extern int sysctl_legacy_va_layout;
#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
extern const int mmap_rnd_bits_min;
-extern const int mmap_rnd_bits_max;
+extern int mmap_rnd_bits_max __ro_after_init;
extern int mmap_rnd_bits __read_mostly;
#endif
#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
diff --git a/mm/mmap.c b/mm/mmap.c
index b56a7f0c9f85..ed1b178b223a 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -64,7 +64,7 @@
#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
const int mmap_rnd_bits_min = CONFIG_ARCH_MMAP_RND_BITS_MIN;
-const int mmap_rnd_bits_max = CONFIG_ARCH_MMAP_RND_BITS_MAX;
+int mmap_rnd_bits_max __ro_after_init = CONFIG_ARCH_MMAP_RND_BITS_MAX;
int mmap_rnd_bits __read_mostly = CONFIG_ARCH_MMAP_RND_BITS;
#endif
#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
--
2.42.0.582.g8ccd20d70d-goog
next prev parent reply other threads:[~2023-09-29 21:12 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-29 21:11 [PATCH 0/2] riscv: Increase mmap_rnd_bits_max on Sv48/57 Sami Tolvanen
2023-09-29 21:11 ` Sami Tolvanen [this message]
2023-09-29 21:55 ` [PATCH 1/2] mm: Change mmap_rnd_bits_max to __ro_after_init Kees Cook
2023-09-29 21:11 ` [PATCH 2/2] riscv: mm: Update mmap_rnd_bits_max Sami Tolvanen
2023-09-29 21:54 ` Kees Cook
2023-09-29 22:52 ` Sami Tolvanen
2023-09-30 9:02 ` Conor Dooley
2023-09-30 21:01 ` Kees Cook
2023-10-01 15:19 ` Pedro Falcato
2023-10-02 7:02 ` Alexandre Ghiti
2023-10-02 15:58 ` Sami Tolvanen
2023-12-06 13:14 ` [PATCH 0/2] riscv: Increase mmap_rnd_bits_max on Sv48/57 Palmer Dabbelt
2023-12-06 20:28 ` Kees Cook
2024-01-17 20:29 ` Sami Tolvanen
2024-01-25 21:30 ` patchwork-bot+linux-riscv
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