add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/mm/highmem.c
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@@ -29,11 +29,10 @@
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 #include <linux/highmem.h>
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 #include <linux/kgdb.h>
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 #include <asm/tlbflush.h>
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+#include <linux/vmalloc.h>
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-#ifndef CONFIG_PREEMPT_RT_FULL
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 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32)
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 DEFINE_PER_CPU(int, __kmap_atomic_idx);
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-#endif
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 #endif
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 /*
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@@ -106,12 +105,10 @@
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 }
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 #endif
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-unsigned long totalhigh_pages __read_mostly;
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-EXPORT_SYMBOL(totalhigh_pages);
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+atomic_long_t _totalhigh_pages __read_mostly;
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+EXPORT_SYMBOL(_totalhigh_pages);
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-#ifndef CONFIG_PREEMPT_RT_FULL
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 EXPORT_PER_CPU_SYMBOL(__kmap_atomic_idx);
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-#endif
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 unsigned int nr_free_highpages (void)
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 {
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@@ -372,7 +369,7 @@
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 }
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 EXPORT_SYMBOL(kunmap_high);
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-#endif
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+#endif	/* CONFIG_HIGHMEM */
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 #if defined(HASHED_PAGE_VIRTUAL)
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@@ -484,4 +481,4 @@
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 	}
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 }
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-#endif	/* defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) */
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+#endif	/* defined(HASHED_PAGE_VIRTUAL) */