powerpc/code-patching: Remove init_mem_is_free

A new state has been added by commit d2635f2 ("mm: create a new
system state and fix core_kernel_text()"). That state tells when
initmem is about to be released and is redundant with init_mem_is_free.

Remove init_mem_is_free.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ad8c3ccb39c8edaa89fd3eda1cc7218baea1cde5.1638446239.git.christophe.leroy@csgroup.eu

arch/powerpc/include/asm/setup.h

@@ -9,7 +9,6 @@ extern void ppc_printk_progress(char *s, unsigned short hex);
 
 extern unsigned int rtas_data;
 extern unsigned long long memory_limit;
-extern bool init_mem_is_free;
 extern void *zalloc_maybe_bootmem(size_t size, gfp_t mask);
 
 struct device_node;

arch/powerpc/lib/code-patching.c

@@ -15,7 +15,6 @@
 #include <asm/tlbflush.h>
 #include <asm/page.h>
 #include <asm/code-patching.h>
-#include <asm/setup.h>
 #include <asm/inst.h>
 
 static int __patch_instruction(u32 *exec_addr, ppc_inst_t instr, u32 *patch_addr)
@@ -187,7 +186,7 @@ static int do_patch_instruction(u32 *addr, ppc_inst_t instr)
 int patch_instruction(u32 *addr, ppc_inst_t instr)
 {
 	/* Make sure we aren't patching a freed init section */
-	if (init_mem_is_free && init_section_contains(addr, 4))
+	if (system_state >= SYSTEM_FREEING_INITMEM && init_section_contains(addr, 4))
 		return 0;
 
 	return do_patch_instruction(addr, instr);

arch/powerpc/mm/mem.c

@@ -26,7 +26,6 @@
 #include <mm/mmu_decl.h>
 
 unsigned long long memory_limit;
-bool init_mem_is_free;
 
 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
 EXPORT_SYMBOL(empty_zero_page);
@@ -312,7 +311,6 @@ void free_initmem(void)
 {
 	ppc_md.progress = ppc_printk_progress;
 	mark_initmem_nx();
-	init_mem_is_free = true;
 	free_initmem_default(POISON_FREE_INITMEM);
 }