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x86/mm/init: Add helper for freeing kernel image pages

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When chunks of the kernel image are freed, free_init_pages() is used
directly.  Consolidate the three sites that do this.  Also update the
string to give an incrementally better description of that memory versus
what was there before.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: keescook@google.com
Cc: aarcange@redhat.com
Cc: jgross@suse.com
Cc: jpoimboe@redhat.com
Cc: gregkh@linuxfoundation.org
Cc: peterz@infradead.org
Cc: hughd@google.com
Cc: torvalds@linux-foundation.org
Cc: bp@alien8.de
Cc: luto@kernel.org
Cc: ak@linux.intel.com
Cc: Kees Cook <keescook@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Link: https://lkml.kernel.org/r/20180802225829.FE0E32EA@viggo.jf.intel.com
This commit is contained in:
Dave Hansen 2018-08-02 15:58:29 -07:00 committed by Thomas Gleixner
parent 9f515cdb41
commit 6ea2738e0c
3 changed files with 15 additions and 5 deletions
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1
arch/x86/include/asm/processor.h
View File

@ -966,6 +966,7 @@ static inline uint32_t hypervisor_cpuid_base(const char *sig, uint32_t leaves)
extern unsigned long arch_align_stack(unsigned long sp);
extern void free_init_pages(char *what, unsigned long begin, unsigned long end);
extern void free_kernel_image_pages(void *begin, void *end);
void default_idle(void);
#ifdef CONFIG_XEN

15
arch/x86/mm/init.c
View File

@ -773,13 +773,22 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end)
}
}
/*
* begin/end can be in the direct map or the "high kernel mapping"
* used for the kernel image only. free_init_pages() will do the
* right thing for either kind of address.
*/
void free_kernel_image_pages(void *begin, void *end)
{
free_init_pages("unused kernel image",
(unsigned long)begin, (unsigned long)end);
}
void __ref free_initmem(void)
{
e820__reallocate_tables();
free_init_pages("unused kernel",
(unsigned long)(&__init_begin),
(unsigned long)(&__init_end));
free_kernel_image_pages(&__init_begin, &__init_end);
}
#ifdef CONFIG_BLK_DEV_INITRD

4
arch/x86/mm/init_64.c
View File

@ -1283,8 +1283,8 @@ void mark_rodata_ro(void)
set_memory_ro(start, (end-start) >> PAGE_SHIFT);
#endif
free_init_pages("unused kernel", text_end, rodata_start);
free_init_pages("unused kernel", rodata_end, _sdata);
free_kernel_image_pages((void *)text_end, (void *)rodata_start);
free_kernel_image_pages((void *)rodata_end, (void *)_sdata);
debug_checkwx();