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csky: syscache: Fixup duplicate cache flush

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[ Upstream commit 6ea42c84f33368eb3fe1ec1bff8d7cb1a5c7b07a ]

The current csky logic of sys_cacheflush is wrong, it'll cause
icache flush call dcache flush again. Now fixup it with a
conditional "break & fallthrough".

Fixes: 997153b9a7 ("csky: Add flush_icache_mm to defer flush icache all")
Fixes: 0679d29d3e23 ("csky: fix syscache.c fallthrough warning")
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Co-Developed-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Guo Ren 2021-05-04 14:08:44 +08:00 committed by Greg Kroah-Hartman
parent 3483e1a41c
commit b6a41435c8
1 changed files with 7 additions and 5 deletions
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12
arch/csky/mm/syscache.c
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@ -12,15 +12,17 @@ SYSCALL_DEFINE3(cacheflush,
int, cache)
{
switch (cache) {
case ICACHE:
case BCACHE:
flush_icache_mm_range(current->mm,
(unsigned long)addr,
(unsigned long)addr + bytes);
fallthrough;
case DCACHE:
dcache_wb_range((unsigned long)addr,
(unsigned long)addr + bytes);
if (cache != BCACHE)
break;
fallthrough;
case ICACHE:
flush_icache_mm_range(current->mm,
(unsigned long)addr,
(unsigned long)addr + bytes);
break;
default:
return -EINVAL;