ARM: xscale: fix multi-cpu compilation

Building a combined ARMv4+XScale kernel produces these
and other build failures:

/tmp/copypage-xscale-3aa821.s: Assembler messages:
/tmp/copypage-xscale-3aa821.s:167: Error: selected processor does not support `pld [r7,#0]' in ARM mode
/tmp/copypage-xscale-3aa821.s:168: Error: selected processor does not support `pld [r7,#32]' in ARM mode
/tmp/copypage-xscale-3aa821.s:169: Error: selected processor does not support `pld [r1,#0]' in ARM mode
/tmp/copypage-xscale-3aa821.s:170: Error: selected processor does not support `pld [r1,#32]' in ARM mode
/tmp/copypage-xscale-3aa821.s:171: Error: selected processor does not support `pld [r7,#64]' in ARM mode
/tmp/copypage-xscale-3aa821.s:176: Error: selected processor does not support `ldrd r4,r5,[r7],#8' in ARM mode
/tmp/copypage-xscale-3aa821.s:180: Error: selected processor does not support `strd r4,r5,[r1],#8' in ARM mode

Add an explict .arch armv5 in the inline assembly to allow the ARMv5
specific instructions regardless of the compiler -march= target.

Link: https://lore.kernel.org/r/20190809163334.489360-5-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/arch/arm/mm/copypage-xscale.c b/arch/arm/mm/copypage-xscale.c
index 61d8341..382e1c2 100644 (file)
--- a/arch/arm/mm/copypage-xscale.c
+++ b/arch/arm/mm/copypage-xscale.c
@@ -42,6 +42,7 @@ static void mc_copy_user_page(void *from, void *to)
         * when prefetching destination as well.  (NP)
         */
        asm volatile ("\
+.arch xscale                                   \n\
        pld     [%0, #0]                        \n\
        pld     [%0, #32]                       \n\
        pld     [%1, #0]                        \n\
@@ -106,8 +107,9 @@ void
 xscale_mc_clear_user_highpage(struct page *page, unsigned long vaddr)
 {
        void *ptr, *kaddr = kmap_atomic(page);
-       asm volatile(
-       "mov    r1, %2                          \n\
+       asm volatile("\
+.arch xscale                                   \n\
+       mov     r1, %2                          \n\
        mov     r2, #0                          \n\
        mov     r3, #0                          \n\
 1:     mov     ip, %0                          \n\