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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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b6a41435c8
[ 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>
33 lines
623 B
C
33 lines
623 B
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/syscalls.h>
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#include <asm/page.h>
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#include <asm/cacheflush.h>
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#include <asm/cachectl.h>
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SYSCALL_DEFINE3(cacheflush,
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void __user *, addr,
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unsigned long, bytes,
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int, cache)
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{
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switch (cache) {
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case BCACHE:
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case DCACHE:
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dcache_wb_range((unsigned long)addr,
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(unsigned long)addr + bytes);
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if (cache != BCACHE)
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break;
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fallthrough;
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case ICACHE:
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flush_icache_mm_range(current->mm,
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(unsigned long)addr,
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(unsigned long)addr + bytes);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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