Ryan Roberts 36106d1c27 sparc/mm: disable preemption in lazy mmu mode ... commit a1d416bf9f upstream. Since commit 38e0edb15b ("mm/apply_to_range: call pte function with lazy updates") it's been possible for arch_[enter|leave]_lazy_mmu_mode() to be called without holding a page table lock (for the kernel mappings case), and therefore it is possible that preemption may occur while in the lazy mmu mode. The Sparc lazy mmu implementation is not robust to preemption since it stores the lazy mode state in a per-cpu structure and does not attempt to manage that state on task switch. Powerpc had the same issue and fixed it by explicitly disabling preemption in arch_enter_lazy_mmu_mode() and re-enabling in arch_leave_lazy_mmu_mode(). See commit b9ef323ea1 ("powerpc/64s: Disable preemption in hash lazy mmu mode"). Given Sparc's lazy mmu mode is based on powerpc's, let's fix it in the same way here. Link: https://lkml.kernel.org/r/20250303141542.3371656-4-ryan.roberts@arm.com Fixes: 38e0edb15b ("mm/apply_to_range: call pte function with lazy updates") Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Acked-by: David Hildenbrand <david@redhat.com> Acked-by: Andreas Larsson <andreas@gaisler.com> Acked-by: Juergen Gross <jgross@suse.com> Cc: Borislav Betkov <bp@alien8.de> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David S. Miller <davem@davemloft.net> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Juegren Gross <jgross@suse.com> Cc: Matthew Wilcow (Oracle) <willy@infradead.org> Cc: Thomas Gleinxer <tglx@linutronix.de> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-04-25 10:43:42 +02:00
..
boot
configs
crypto	sparc: Explicitly include correct DT includes	2024-04-03 15:19:33 +02:00
include	mm: remove kern_addr_valid() completely	2024-11-08 16:26:39 +01:00
kernel	syscalls: fix compat_sys_io_pgetevents_time64 usage	2024-07-05 09:31:59 +02:00
lib	sparc32: fix a braino in fault handling in csum_and_copy_..._user()	2023-11-02 09:35:32 +01:00
math-emu
mm	sparc/mm: disable preemption in lazy mmu mode	2025-04-25 10:43:42 +02:00
net
power
prom	sparc64: Fix incorrect function signature and add prototype for prom_cif_init	2024-08-03 08:49:16 +02:00
vdso	sparc: vDSO: fix return value of __setup handler	2024-04-03 15:19:26 +02:00
Kbuild
Kconfig	sparc/cpu: Switch to arch_cpu_finalize_init()	2023-08-08 20:03:47 +02:00
Kconfig.debug
Makefile