On Friday, August 5, 2016 10:26:25 PM CEST Nicholas Piggin wrote:

On Fri, 05 Aug 2016 12:17:27 +0200
Arnd Bergmann [off-list ref] wrote:

quoted

and I also get link errors for the .text.fixup section
for any users of __put_user() in really large kernels:
net/batman-adv/batman-adv.o:(.text.fixup+0x4): relocation truncated to fit: R_ARM_JUMP24 against `.text.batadv_log_read'

This may be fixed by fixing the linker script to bring in the new
sections properly (see new patchset).

If not, then if you can combine the sections rather than have them
consecutive in the output, e.g.,:

    *(.text .text.fixup)

Rather than

    *(.text)            
    *(.text.fixup)

Then the linker has more freedom to rearrange them. I realize it's
not that simple with ARM's .text.fixup, but maybe that helps you
get it to work.

This did the trick:

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 0ec807d69f18..7a3ad269fa23 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h

@@ -433,7 +433,7 @@
  * during second ld run in second ld pass when generating System.map */
 #define TEXT_TEXT							\
 		ALIGN_FUNCTION();					\
-		*(.text.hot .text .text.fixup .text.unlikely)		\
+		*(.text.hot .text .text.* .text.fixup .text.unlikely)	\
 		*(.ref.text)						\
 	MEM_KEEP(init.text)						\
 	MEM_KEEP(exit.text)						\

It also got much faster again, the link time for an allyesconfig
kernel is now 18 minutes instead of 10 hours, but it's still
much worse than the 2 minutes I had earlier or the four minutes
with the previous patch.

	Arnd