From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 47FB96669B for ; Fri, 29 Sep 2023 21:12:01 +0000 (UTC) Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-59f8134eb83so186994817b3.2 for ; Fri, 29 Sep 2023 14:12:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1696021920; x=1696626720; darn=lists.linux.dev; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=FR1ZKwT/o63KmLhMDo8tUZzc0vKzUsUCbtQdapDGJGA=; b=GmUBtooL1aJ2UskWHLlQecDNILaChISjbDIAE/gqEt8DGE3XAsjVbY3021dWluzLDe h4jnA4MTLKCjobIN1hI30Chfa1RqGatLoltAjxA69XC9jsc73sDyTsxyE3Y7h5D+ADhM +2NMjYAEdCPFgwhctHSCTklciTVdC+BkauxPkm0/h3vB1r0GiafreEGDx+wAxYX5inFp ECl5kU4dlW3w0qpZkm9SrrR682RP86BqIMaI9amFblOyZEoXQ8lTORakdOGMGg9OF1ES VQPYYm6RM4abFRUIKCIMyg6oh2mGPlUJNEx96xPYRQ5XdyURThvPKZxbbXbsMYt/delT B6bQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696021920; x=1696626720; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=FR1ZKwT/o63KmLhMDo8tUZzc0vKzUsUCbtQdapDGJGA=; b=h8K6OA0I+P0cDIlxQNzrnB5MgmRnGpyX9ZYamB1WxR8uCzPr1rEMRa1mR/HEcTUULb qiOLEiskx1TCsZQSE1q+NBwnqlkQ2sXgHe0L7WP4AN1AmLBU8Lf67rcl+8ZWPcimhxsY 3etcuMnveRVw+hg355BV+8wOyXR1s9iAkfepR9eFbdnssPiuhcle2IOsLI/t3PqkYvn+ /qQdwXaKNqc4HA74tbGZqdjoL75lCKEViMzorLtXVZcwCd9/v9bVcpVB0Bzao1R5A97p owvQ70LaCb5Euzg1PNaT5JDRIEpOSqfAdwCqP1A290iomxQFwHt+Zf5JzkvyDSPUHVje 2OIA== X-Gm-Message-State: AOJu0YypKay0cb4GFKLpJneT6EYYuNNtq/bp44rqS9/DZIeWcYDyHE0D SIrD59djSqG3J0JqGUOs+A0jtj+TjbJaZziqTXY= X-Google-Smtp-Source: AGHT+IHnDIypgcCWBxPESiB/yrBCpKXqORME3PWFhWMxCeyFk9cmGmraRzLwQcSrcYatS2Uvi9kN6m0eWCmXEF8Vfz0= X-Received: from samitolvanen.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:4f92]) (user=samitolvanen job=sendgmr) by 2002:a25:6812:0:b0:d13:856b:c10a with SMTP id d18-20020a256812000000b00d13856bc10amr77200ybc.3.1696021920090; Fri, 29 Sep 2023 14:12:00 -0700 (PDT) Date: Fri, 29 Sep 2023 21:11:57 +0000 In-Reply-To: <20230929211155.3910949-4-samitolvanen@google.com> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20230929211155.3910949-4-samitolvanen@google.com> X-Developer-Key: i=samitolvanen@google.com; a=openpgp; fpr=35CCFB63B283D6D3AEB783944CB5F6848BBC56EE X-Developer-Signature: v=1; a=openpgp-sha256; l=1359; i=samitolvanen@google.com; h=from:subject; bh=ARqQmg1Q7FqF1vgF9dpD7yhcKdtd1MfRgn2maiynoVQ=; b=owEB7QES/pANAwAKAUy19oSLvFbuAcsmYgBlFz2bINQRa9JuNqXpxYBQVzDJb/c0+7N1HB+sp 2/Sm1UUS7iJAbMEAAEKAB0WIQQ1zPtjsoPW0663g5RMtfaEi7xW7gUCZRc9mwAKCRBMtfaEi7xW 7vOOC/9tO/6MqlDPfjsiexFNXOEfW7Ar2H9OEVyVIE92EgZgm/mYuBlQqBRKkWvnSCUPZ+ktWxw /8gD9WFejtTnKMje8tf/4wwgxbVQuClXmgi7zZQJvbJ2+SG6cp6B7JcXsMhPsJsbuh3NhTEQj/o pgpvv9Uyv2mK/vRlud+N82dGqhUfLNAWNPfHmZmQ/tMcij5bpFL8VvhWPFF6Akufb6mjaM9D8vG +cR914ZzFo93wp2YlrOemHXK7uUcqH8HHjkYtoFn7o8xhU+VQ7oy1yajipTLM7ewaa0tOrdIWqa 08cpT5V8GX3uAGGuFOzPlMxeF7o/GIDLXMxDfovUqIRoGLzciTjGMCqRmRapZU6oY3GqWEqPSnx GnCaN0xzRvU31sMOUQQkusxUC/3qLR05lv7v/sDAlG5Yah5czQB5w1+2ClKsbQ3sCX6HmpcfWsx r/VvM19V0Dekn+5QLhuwnCOlt6Hs+HBdn3kG1truvPJvtRa+QxsCoiBcfxXnVWnQrVOuI= X-Mailer: git-send-email 2.42.0.582.g8ccd20d70d-goog Message-ID: <20230929211155.3910949-5-samitolvanen@google.com> Subject: [PATCH 1/2] mm: Change mmap_rnd_bits_max to __ro_after_init From: Sami Tolvanen To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Andrew Morton , Kees Cook Cc: linux-mm@kvack.org, linux-riscv@lists.infradead.org, llvm@lists.linux.dev, linux-kernel@vger.kernel.org, Sami Tolvanen Content-Type: text/plain; charset="UTF-8" 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 --- 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