linux-kernel - [PATCH 5.11 13/36] parisc: Enable -mlong-calls gcc option with CONFIG_COMPILE

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Date:   Wed, 10 Mar 2021 14:23:26 +0100
From:   gregkh@...uxfoundation.org
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Helge Deller <deller@....de>,
        kernel test robot <lkp@...el.com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 5.11 13/36] parisc: Enable -mlong-calls gcc option with CONFIG_COMPILE_TEST

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

From: Helge Deller <deller@....de>

commit 778e45d7720d663811352943dd515b41f6849637 upstream

The kernel test robot reported multiple linkage problems like this:

    hppa64-linux-ld: init/main.o(.init.text+0x56c): cannot reach printk
    init/main.o: in function `unknown_bootoption':
    (.init.text+0x56c): relocation truncated to fit: R_PARISC_PCREL22F against
	symbol `printk' defined in .text.unlikely section in kernel/printk/printk.o

There are two ways to solve it:
a) Enable the -mlong-call compiler option (CONFIG_MLONGCALLS),
b) Add long branch stub support in 64-bit linker.

While b) is the long-term solution, this patch works around the issue by
automatically enabling the CONFIG_MLONGCALLS option when
CONFIG_COMPILE_TEST is set, which indicates that a non-production kernel
(e.g. 0-day kernel) is built.

Signed-off-by: Helge Deller <deller@....de>
Reported-by: kernel test robot <lkp@...el.com>
Fixes: 00e35f2b0e8a ("parisc: Enable -mlong-calls gcc option by default when !CONFIG_MODULES")
Cc: stable@...r.kernel.org # v5.6+
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/parisc/Kconfig |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -201,9 +201,12 @@ config PREFETCH
 	def_bool y
 	depends on PA8X00 || PA7200
 
+config PARISC_HUGE_KERNEL
+	def_bool y if !MODULES || UBSAN || FTRACE || COMPILE_TEST
+
 config MLONGCALLS
-	def_bool y if !MODULES || UBSAN || FTRACE
-	bool "Enable the -mlong-calls compiler option for big kernels" if MODULES && !UBSAN && !FTRACE
+	def_bool y if PARISC_HUGE_KERNEL
+	bool "Enable the -mlong-calls compiler option for big kernels" if !PARISC_HUGE_KERNEL
 	depends on PA8X00
 	help
 	  If you configure the kernel to include many drivers built-in instead