linux-kernel - [PATCH] mm/Kconfig: Mention arm64 in DEFAULT_MMAP_MIN

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Date: Wed, 19 Jun 2024 10:30:38 +0200
From: Javier Martinez Canillas <javierm@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Brian Masney <bmasney@...hat.com>,
	linux-arm-kernel@...ts.infradead.org,
	Maxime Ripard <mripard@...nel.org>,
	Javier Martinez Canillas <javierm@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm@...ck.org
Subject: [PATCH] mm/Kconfig: Mention arm64 in DEFAULT_MMAP_MIN_ADDR symbol help text

Currently ppc64 and x86 are mentioned as architectures where a 65536 value
is reasonable but arm64 isn't listed and it is also a 64-bit architecture.

The help text says that for "arm" the value should be no higher than 32768
but it's only talking about 32-bit ARM. Adding arm64 to the above list can
make this more clear and avoid confusing users who may think that the 32k
limit would also apply to 64-bit ARM.

Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
---

 mm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index b4cb45255a54..f7de1e3d6c5f 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -714,7 +714,7 @@ config DEFAULT_MMAP_MIN_ADDR
 	  from userspace allocation.  Keeping a user from writing to low pages
 	  can help reduce the impact of kernel NULL pointer bugs.
 
-	  For most ppc64 and x86 users with lots of address space
+	  For most arm64, ppc64 and x86 users with lots of address space
 	  a value of 65536 is reasonable and should cause no problems.
 	  On arm and other archs it should not be higher than 32768.
 	  Programs which use vm86 functionality or have some need to map
-- 
2.45.1