4.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> commit 6ea2738e0ca0e626c75202fb051c1e88d7a950fa upstream. 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@xxxxxxxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: keescook@xxxxxxxxxx Cc: aarcange@xxxxxxxxxx Cc: jgross@xxxxxxxx Cc: jpoimboe@xxxxxxxxxx Cc: gregkh@xxxxxxxxxxxxxxxxxxx Cc: peterz@xxxxxxxxxxxxx Cc: hughd@xxxxxxxxxx Cc: torvalds@xxxxxxxxxxxxxxxxxxxx Cc: bp@xxxxxxxxx Cc: luto@xxxxxxxxxx Cc: ak@xxxxxxxxxxxxxxx Cc: Kees Cook <keescook@xxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: Juergen Gross <jgross@xxxxxxxx> Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxx> Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx> Link: https://lkml.kernel.org/r/20180802225829.FE0E32EA@xxxxxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/include/asm/processor.h | 1 + arch/x86/mm/init.c | 15 ++++++++++++--- arch/x86/mm/init_64.c | 4 ++-- 3 files changed, 15 insertions(+), 5 deletions(-) --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -971,6 +971,7 @@ static inline uint32_t hypervisor_cpuid_ 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 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -775,13 +775,22 @@ void free_init_pages(char *what, unsigne } } +/* + * 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 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -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();
