X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=arch%2Fx86%2Fkernel%2Falternative.c;h=a81f2d52f869d842d9301d5f9aea5c23a74369a2;hb=016281880439a8665ecf37514865742da58131d4;hp=c0501ea6b634cd4b998ef7002b6ff8b93fc14d05;hpb=865be7a81071a77014c83cd01536c989eed362b4;p=karo-tx-linux.git

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index c0501ea6b634..a81f2d52f869 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -266,6 +266,15 @@ void __init_or_module apply_alternatives(struct alt_instr *start,
 	u8 insnbuf[MAX_PATCH_LEN];
 
 	DPRINTK("%s: alt table %p -> %p\n", __func__, start, end);
+	/*
+	 * The scan order should be from start to end. A later scanned
+	 * alternative code can overwrite a previous scanned alternative code.
+	 * Some kernel functions (e.g. memcpy, memset, etc) use this order to
+	 * patch code.
+	 *
+	 * So be careful if you want to change the scan order to any other
+	 * order.
+	 */
 	for (a = start; a < end; a++) {
 		u8 *instr = a->instr;
 		BUG_ON(a->replacementlen > a->instrlen);