linux-kernel - Re: powerpc allyesconfig / allmodconfig linux-next next-20160729

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Message-ID: <2852406.SOgyPXcJfO@wuerfel>
Date:	Fri, 05 Aug 2016 18:01:13 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	Nicholas Piggin <npiggin@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Luis R. Rodriguez" <mcgrof@...nel.org>,
	linux-next@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Guenter Roeck <linux@...ck-us.net>
Subject: Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures

On Friday, August 5, 2016 10:26:25 PM CEST Nicholas Piggin wrote:
> On Fri, 05 Aug 2016 12:17:27 +0200
> Arnd Bergmann <arnd@...db.de> wrote:

> > 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