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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


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WARNING: multiple messages have this Message-ID (diff)
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


  reply	other threads:[~2023-09-29 21:12 UTC|newest]

Thread overview: 30+ 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
2023-09-29 21:11 ` Sami Tolvanen [this message]
2023-09-29 21:11   ` [PATCH 1/2] mm: Change mmap_rnd_bits_max to __ro_after_init Sami Tolvanen
2023-09-29 21:55   ` Kees Cook
2023-09-29 21:55     ` Kees Cook
2023-09-29 21:11 ` [PATCH 2/2] riscv: mm: Update mmap_rnd_bits_max Sami Tolvanen
2023-09-29 21:11   ` Sami Tolvanen
2023-09-29 21:54   ` Kees Cook
2023-09-29 21:54     ` Kees Cook
2023-09-29 22:52     ` Sami Tolvanen
2023-09-29 22:52       ` Sami Tolvanen
2023-09-30  9:02       ` Conor Dooley
2023-09-30  9:02         ` Conor Dooley
2023-09-30 21:01         ` Kees Cook
2023-09-30 21:01           ` Kees Cook
2023-10-01 15:19           ` Pedro Falcato
2023-10-01 15:19             ` Pedro Falcato
2023-10-02  7:02             ` Alexandre Ghiti
2023-10-02  7:02               ` Alexandre Ghiti
2023-10-02 15:58               ` Sami Tolvanen
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 13:14   ` Palmer Dabbelt
2023-12-06 20:28   ` Kees Cook
2023-12-06 20:28     ` Kees Cook
2024-01-17 20:29   ` Sami Tolvanen
2024-01-17 20:29     ` Sami Tolvanen
2024-01-25 21:30 ` patchwork-bot+linux-riscv
2024-01-25 21:30   ` patchwork-bot+linux-riscv

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