4b599fedb7
Historically a lot of these existed because we did not have a distinction between what was modular code and what was providing support to modules via EXPORT_SYMBOL and friends. That changed when we forked out support for the latter into the export.h file. This means we should be able to reduce the usage of module.h in code that is obj-y Makefile or bool Kconfig. The advantage in doing so is that module.h itself sources about 15 other headers; adding significantly to what we feed cpp, and it can obscure what headers we are effectively using. Since module.h was the source for init.h (for __init) and for export.h (for EXPORT_SYMBOL) we consider each obj-y/bool instance for the presence of either and replace accordingly where needed. Note that some bool/obj-y instances remain since module.h is the header for some exception table entry stuff, and for things like __init_or_module (code that is tossed when MODULES=n). Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20160714001901.31603-3-paul.gortmaker@windriver.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
#include <linux/bootmem.h>
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#include <linux/mmdebug.h>
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#include <linux/export.h>
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#include <linux/mm.h>
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#include <asm/page.h>
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#include "physaddr.h"
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#ifdef CONFIG_X86_64
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#ifdef CONFIG_DEBUG_VIRTUAL
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unsigned long __phys_addr(unsigned long x)
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{
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unsigned long y = x - __START_KERNEL_map;
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/* use the carry flag to determine if x was < __START_KERNEL_map */
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if (unlikely(x > y)) {
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x = y + phys_base;
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VIRTUAL_BUG_ON(y >= KERNEL_IMAGE_SIZE);
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} else {
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x = y + (__START_KERNEL_map - PAGE_OFFSET);
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/* carry flag will be set if starting x was >= PAGE_OFFSET */
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VIRTUAL_BUG_ON((x > y) || !phys_addr_valid(x));
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}
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return x;
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}
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EXPORT_SYMBOL(__phys_addr);
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unsigned long __phys_addr_symbol(unsigned long x)
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{
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unsigned long y = x - __START_KERNEL_map;
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/* only check upper bounds since lower bounds will trigger carry */
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VIRTUAL_BUG_ON(y >= KERNEL_IMAGE_SIZE);
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return y + phys_base;
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}
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EXPORT_SYMBOL(__phys_addr_symbol);
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#endif
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bool __virt_addr_valid(unsigned long x)
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{
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unsigned long y = x - __START_KERNEL_map;
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/* use the carry flag to determine if x was < __START_KERNEL_map */
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if (unlikely(x > y)) {
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x = y + phys_base;
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if (y >= KERNEL_IMAGE_SIZE)
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return false;
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} else {
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x = y + (__START_KERNEL_map - PAGE_OFFSET);
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/* carry flag will be set if starting x was >= PAGE_OFFSET */
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if ((x > y) || !phys_addr_valid(x))
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return false;
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}
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return pfn_valid(x >> PAGE_SHIFT);
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}
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EXPORT_SYMBOL(__virt_addr_valid);
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#else
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#ifdef CONFIG_DEBUG_VIRTUAL
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unsigned long __phys_addr(unsigned long x)
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{
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unsigned long phys_addr = x - PAGE_OFFSET;
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/* VMALLOC_* aren't constants */
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VIRTUAL_BUG_ON(x < PAGE_OFFSET);
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VIRTUAL_BUG_ON(__vmalloc_start_set && is_vmalloc_addr((void *) x));
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/* max_low_pfn is set early, but not _that_ early */
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if (max_low_pfn) {
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VIRTUAL_BUG_ON((phys_addr >> PAGE_SHIFT) > max_low_pfn);
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BUG_ON(slow_virt_to_phys((void *)x) != phys_addr);
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}
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return phys_addr;
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}
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EXPORT_SYMBOL(__phys_addr);
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#endif
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bool __virt_addr_valid(unsigned long x)
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{
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if (x < PAGE_OFFSET)
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return false;
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if (__vmalloc_start_set && is_vmalloc_addr((void *) x))
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return false;
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if (x >= FIXADDR_START)
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return false;
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return pfn_valid((x - PAGE_OFFSET) >> PAGE_SHIFT);
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}
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EXPORT_SYMBOL(__virt_addr_valid);
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#endif /* CONFIG_X86_64 */
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