[v13,16/18] arm64: kexec: remove the pre-kexec PoC maintenance

Commit Message

Pasha Tatashin April 8, 2021, 4:05 a.m. UTC

Now that kexec does its relocations with the MMU enabled, we no longer
need to clean the relocation data to the PoC.

Co-developed-by: James Morse <[e-mail]>
Signed-off-by: Pavel Tatashin <[e-mail]>
---
 arch/arm64/kernel/machine_kexec.c | 40 -------------------------------
 1 file changed, 40 deletions(-)

Patch

diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c
index d5c8aefc66f3..a1c9bee0cddd 100644
--- a/arch/arm64/kernel/machine_kexec.c
+++ b/arch/arm64/kernel/machine_kexec.c
@@ -76,45 +76,6 @@  int machine_kexec_prepare(struct kimage *kimage)
 	return 0;
 }
 
-/**
- * kexec_list_flush - Helper to flush the kimage list and source pages to PoC.
- */
-static void kexec_list_flush(struct kimage *kimage)
-{
-	kimage_entry_t *entry;
-
-	__flush_dcache_area(kimage, sizeof(*kimage));
-
-	for (entry = &kimage->head; ; entry++) {
-		unsigned int flag;
-		void *addr;
-
-		/* flush the list entries. */
-		__flush_dcache_area(entry, sizeof(kimage_entry_t));
-
-		flag = *entry & IND_FLAGS;
-		if (flag == IND_DONE)
-			break;
-
-		addr = phys_to_virt(*entry & PAGE_MASK);
-
-		switch (flag) {
-		case IND_INDIRECTION:
-			/* Set entry point just before the new list page. */
-			entry = (kimage_entry_t *)addr - 1;
-			break;
-		case IND_SOURCE:
-			/* flush the source pages. */
-			__flush_dcache_area(addr, PAGE_SIZE);
-			break;
-		case IND_DESTINATION:
-			break;
-		default:
-			BUG();
-		}
-	}
-}
-
 /**
  * kexec_segment_flush - Helper to flush the kimage segments to PoC.
  */
@@ -200,7 +161,6 @@  int machine_kexec_post_load(struct kimage *kimage)
 	__flush_dcache_area(reloc_code, reloc_size);
 	flush_icache_range((uintptr_t)reloc_code, (uintptr_t)reloc_code +
 			   reloc_size);
-	kexec_list_flush(kimage);
 	kexec_image_info(kimage);
 
 	return 0;