add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/mips/mm/cache.c
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@@ -14,9 +14,9 @@
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 #include <linux/sched.h>
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 #include <linux/syscalls.h>
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 #include <linux/mm.h>
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+#include <linux/highmem.h>
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 #include <asm/cacheflush.h>
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-#include <asm/highmem.h>
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 #include <asm/processor.h>
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 #include <asm/cpu.h>
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 #include <asm/cpu-features.h>
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@@ -36,7 +36,6 @@
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 void (*local_flush_icache_range)(unsigned long start, unsigned long end);
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 EXPORT_SYMBOL_GPL(local_flush_icache_range);
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 void (*__flush_icache_user_range)(unsigned long start, unsigned long end);
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-EXPORT_SYMBOL_GPL(__flush_icache_user_range);
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 void (*__local_flush_icache_user_range)(unsigned long start, unsigned long end);
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 EXPORT_SYMBOL_GPL(__local_flush_icache_user_range);
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@@ -47,7 +46,6 @@
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 EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
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 /* MIPS specific cache operations */
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-void (*flush_cache_sigtramp)(unsigned long addr);
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 void (*local_flush_data_cache_page)(void * addr);
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 void (*flush_data_cache_page)(unsigned long addr);
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 void (*flush_icache_all)(void);
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@@ -63,8 +61,6 @@
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 void (*_dma_cache_wback)(unsigned long start, unsigned long size);
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 void (*_dma_cache_inv)(unsigned long start, unsigned long size);
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-EXPORT_SYMBOL(_dma_cache_wback_inv);
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-
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 #endif /* CONFIG_DMA_NONCOHERENT */
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 /*
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@@ -76,7 +72,7 @@
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 {
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 	if (bytes == 0)
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 		return 0;
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-	if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
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+	if (!access_ok((void __user *) addr, bytes))
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 		return -EFAULT;
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 	__flush_icache_user_range(addr, addr + bytes);
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@@ -107,7 +103,7 @@
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 	flush_data_cache_page(addr);
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 	if (PageHighMem(page))
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-		__kunmap_atomic((void *)addr);
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+		kunmap_atomic((void *)addr);
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 }
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 EXPORT_SYMBOL(__flush_dcache_page);
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@@ -150,7 +146,7 @@
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 			flush_data_cache_page(addr);
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 		if (PageHighMem(page))
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-			__kunmap_atomic((void *)addr);
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+			kunmap_atomic((void *)addr);
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 		ClearPageDcacheDirty(page);
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 	}