x86/mm/init: Pass unconverted symbol addresses to free_init_pages()

The x86 code has several places where it frees parts of kernel image:

 1. Unused SMP alternative
 2. __init code
 3. The hole between text and rodata
 4. The hole between rodata and data

We call free_init_pages() to do this.  Strangely, we convert the symbol
addresses to kernel direct map addresses in some cases (#3, #4) but not
others (#1, #2).

The virt_to_page() and the other code in free_reserved_area() now works
fine for for symbol addresses on x86, so don't bother converting the
addresses to direct map addresses before freeing them.

Signed-off-by: Dave Hansen <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Kees Cook <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Andi Kleen <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index a688617c727e1ec3558e158156c98b4632b0d9a2..73158655c4a7ac1a3397e4c1b15b9a793521b462 100644 (file)
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1283,12 +1283,8 @@ void mark_rodata_ro(void)
        set_memory_ro(start, (end-start) >> PAGE_SHIFT);
 #endif
 
-       free_init_pages("unused kernel",
-                       (unsigned long) __va(__pa_symbol(text_end)),
-                       (unsigned long) __va(__pa_symbol(rodata_start)));
-       free_init_pages("unused kernel",
-                       (unsigned long) __va(__pa_symbol(rodata_end)),
-                       (unsigned long) __va(__pa_symbol(_sdata)));
+       free_init_pages("unused kernel", text_end, rodata_start);
+       free_init_pages("unused kernel", rodata_end, _sdata);
 
        debug_checkwx();