The patch titled
Subject: mm/ioremap: add slab availability checking in ioremap_prot
has been added to the -mm mm-unstable branch. Its filename is
mm-ioremap-add-slab-availability-checking-in-ioremap_prot.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-ioremap-add-slab-availability-checking-in-ioremap_prot.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Baoquan He <bhe@xxxxxxxxxx>
Subject: mm/ioremap: add slab availability checking in ioremap_prot
Date: Thu, 6 Jul 2023 23:45:07 +0800
Several architectures has done checking if slab if available in
ioremap_prot(). In fact it should be done in generic ioremap_prot() since
on any architecutre, slab allocator must be available before
get_vm_area_caller() and vunmap() are used.
Add the checking into generic_ioremap_prot().
Link: https://lkml.kernel.org/r/20230706154520.11257-7-bhe@xxxxxxxxxx
Suggested-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Reviewed-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Cc: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Brian Cain <bcain@xxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>
Cc: Chris Zankel <chris@xxxxxxxxxx>
Cc: David Laight <David.Laight@xxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>
Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Cc: "James E.J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
Cc: Jonas Bonn <jonas@xxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Max Filippov <jcmvbkbc@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Stafford Horne <shorne@xxxxxxxxx>
Cc: Stefan Kristiansson <stefan.kristiansson@xxxxxxxxxxxxx>
Cc: Sven Schnelle <svens@xxxxxxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Vineet Gupta <vgupta@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/ioremap.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/mm/ioremap.c~mm-ioremap-add-slab-availability-checking-in-ioremap_prot
+++ a/mm/ioremap.c
@@ -18,6 +18,10 @@ void __iomem *generic_ioremap_prot(phys_
phys_addr_t last_addr;
struct vm_struct *area;
+ /* An early platform driver might end up here */
+ if (WARN_ON_ONCE(!slab_is_available()))
+ return NULL;
+
/* Disallow wrap-around or zero size */
last_addr = phys_addr + size - 1;
if (!size || last_addr < phys_addr)
_
Patches currently in -mm which might be from bhe@xxxxxxxxxx are
asm-generic-iomaph-remove-arch_has_ioremap_xx-macros.patch
hexagon-mm-convert-to-generic_ioremap.patch
openrisc-mm-remove-unneeded-early-ioremap-code.patch
mm-ioremap-allow-arch-to-have-its-own-ioremap-method-definition.patch
mm-ioremap-add-slab-availability-checking-in-ioremap_prot.patch
arc-mm-convert-to-generic_ioremap.patch
ia64-mm-convert-to-generic_ioremap.patch
openrisc-mm-convert-to-generic_ioremap.patch
s390-mm-convert-to-generic_ioremap.patch
sh-add-asm-generic-ioh-including.patch
sh-mm-convert-to-generic_ioremap.patch
xtensa-mm-convert-to-generic_ioremap.patch
parisc-mm-convert-to-generic_ioremap.patch
mm-move-is_ioremap_addr-into-new-header-file.patch
arm64-mm-add-wrapper-function-ioremap_prot.patch
mm-ioremap-remove-unneeded-ioremap_allowed-and-iounmap_allowed.patch
