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mm: introduce cpu_icache_is_aliasing() across all architectures

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In commit eacd0e950d ("ARC: [mm] Lazy D-cache flush (non aliasing
VIPT)"), arc adds the need to flush dcache to make icache see the code
page change.  This also requires special handling for
clear_user_(high)page().  Introduce cpu_icache_is_aliasing() to make MM
code query special clear_user_(high)page() easier.  This will be used by
the following commit.

Link: https://lkml.kernel.org/r/20241209182326.2955963-1-ziy@nvidia.com
Fixes: 5708d96da2 ("mm: avoid zeroing user movable page twice with init_on_alloc=1")
Signed-off-by: Zi Yan <ziy@nvidia.com>
Suggested-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Alexander Potapenko <glider@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Vineet Gupta <vgupta@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Zi Yan 2024-12-09 13:23:25 -05:00 committed by Andrew Morton
parent 31c5629920
commit 5c0541e11c
3 changed files with 15 additions and 0 deletions
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1
arch/arc/Kconfig
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@ -6,6 +6,7 @@
config ARC
def_bool y
select ARC_TIMERS
select ARCH_HAS_CPU_CACHE_ALIASING
select ARCH_HAS_CACHE_LINE_SIZE
select ARCH_HAS_DEBUG_VM_PGTABLE
select ARCH_HAS_DMA_PREP_COHERENT

8
arch/arc/include/asm/cachetype.h Normal file
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@ -0,0 +1,8 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_ARC_CACHETYPE_H
#define __ASM_ARC_CACHETYPE_H
#define cpu_dcache_is_aliasing() false
#define cpu_icache_is_aliasing() true
#endif

6
include/linux/cacheinfo.h
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@ -155,8 +155,14 @@ static inline int get_cpu_cacheinfo_id(int cpu, int level)
#ifndef CONFIG_ARCH_HAS_CPU_CACHE_ALIASING
#define cpu_dcache_is_aliasing() false
#define cpu_icache_is_aliasing() cpu_dcache_is_aliasing()
#else
#include <asm/cachetype.h>
#ifndef cpu_icache_is_aliasing
#define cpu_icache_is_aliasing() cpu_dcache_is_aliasing()
#endif
#endif
#endif /* _LINUX_CACHEINFO_H */