include/asm/alternative.h

1 /* SPDX-License-Identifier: GPL-2.0 */
24  * Alternative inline assembly for SMP.
29  * SMP alternatives use the same data structures as the other
31  * UP system running a SMP kernel.  The existing apply_alternatives()
32  * works fine for patching a SMP kernel for UP.
34  * The SMP alternative tables can be kept after boot and contain both
35  * UP and SMP versions of the instructions to allow switching back to
36  * SMP at runtime, when hotplugging in a new CPU, which is especially
48 		".long 671f - .\n" /* offset */		\
70 	s32 repl_offset;	/* offset to replacement instruction */
181 #define alt_slen		"772b-771b"
182 #define alt_total_slen		"773b-771b"
183 #define alt_rlen		"775f-774f"
189 	".skip -(((" alt_rlen ")-(" alt_slen ")) > 0) * "		\
190 		"((" alt_rlen ")-(" alt_slen ")),0x90\n"		\
195 	" .long 771b - .\n"				/* label           */ \
196 	" .long 774f - .\n"				/* new instruction */ \
265  * constant expression with all syntax-specific punctuation omitted. %P
266  * is the x86-specific variant which can handle constants too, for
306 	     ".size " #func ", . - " #func "\n\t"	\
319 	.long 672b - .
334 	.long \orig - .
335 	.long \alt - .
355 	.skip -(((744f-743f)-(741b-740b)) > 0) * ((744f-743f)-(741b-740b)),0x90	;\
358 	altinstr_entry 740b,743f,flag,742b-740b,744f-743f ;		\
370 #define old_len			141b-140b
371 #define new_len1		144f-143f
372 #define new_len2		145f-144f
373 #define new_len3		146f-145f