linux-jlime-ben-nanonote: fix GCC-4.6 build errors

The following changes fix build errors occuring on linux kernel 2.6.36
for the ben-nanonote machine:
- add LIC_FILES_CHKSUM,
- add "fix-gcc-4.6.0-build-errors.patch" patch file to fix an issue
  where gcc errors on 'unused but set variables' in kernel code. Issue
  fixed as in upstream mainline kernel in changesets #f1b6a505,
  #c726b822, #7a6e4ca1, #91b51f30, #71271aab and #d3ce0e98.

Signed-off-by: Apelete Seketeli <apelete@seketeli.net>

2 files changed, 128 insertions, 1 deletions

diff --git a/recipes-kernel/linux/linux-jlime-ben-nanonote-2.6.36/fix-gcc-4.6.0-build-errors.patch b/recipes-kernel/linux/linux-jlime-ben-nanonote-2.6.36/fix-gcc-4.6.0-build-errors.patch
new file mode 100644
index 0000000..61c0724
--- /dev/null
+++ b/recipes-kernel/linux/linux-jlime-ben-nanonote-2.6.36/fix-gcc-4.6.0-build-errors.patch
@@ -0,0 +1,124 @@
+Fix GCC-4.6.0 'unused but set variables' build errors
+
+GCC-4.6 can find more unused code than previous versions could.
+This fixes relevant code as in upstream mainline kernel in changesets
+#f1b6a505, #c726b822, #7a6e4ca1, #91b51f30, #71271aab and #d3ce0e98.
+
+Signed-off-by: Apelete Seketeli <apelete@seketeli.net>
+
+Upstream-Status: Backport
+
+diff --git a/arch/mips/jz4740/dma.c b/arch/mips/jz4740/dma.c
+index 5ebe75a..d7feb89 100644
+--- a/arch/mips/jz4740/dma.c
++++ b/arch/mips/jz4740/dma.c
+@@ -242,9 +242,7 @@ EXPORT_SYMBOL_GPL(jz4740_dma_get_residue);
+ 
+ static void jz4740_dma_chan_irq(struct jz4740_dma_chan *dma)
+ {
+-	uint32_t status;
+-
+-	status = jz4740_dma_read(JZ_REG_DMA_STATUS_CTRL(dma->id));
++	(void) jz4740_dma_read(JZ_REG_DMA_STATUS_CTRL(dma->id));
+ 
+ 	jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id), 0,
+ 		JZ_DMA_STATUS_CTRL_ENABLE | JZ_DMA_STATUS_CTRL_TRANSFER_DONE);
+diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
+index 5922342..dbbe0ce 100644
+--- a/arch/mips/kernel/signal.c
++++ b/arch/mips/kernel/signal.c
+@@ -84,7 +84,7 @@ static int protected_save_fp_context(struct sigcontext __user *sc)
+ 
+ static int protected_restore_fp_context(struct sigcontext __user *sc)
+ {
+-	int err, tmp;
++	int err, tmp __maybe_unused;
+ 	while (1) {
+ 		lock_fpu_owner();
+ 		own_fpu_inatomic(0);
+diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c
+index a0ed0e0..aae9866 100644
+--- a/arch/mips/kernel/signal32.c
++++ b/arch/mips/kernel/signal32.c
+@@ -115,7 +115,7 @@ static int protected_save_fp_context32(struct sigcontext32 __user *sc)
+ 
+ static int protected_restore_fp_context32(struct sigcontext32 __user *sc)
+ {
+-	int err, tmp;
++	int err, tmp __maybe_unused;
+ 	while (1) {
+ 		lock_fpu_owner();
+ 		own_fpu_inatomic(0);
+diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c
+index 1dc6edf..18cd6f9 100644
+--- a/arch/mips/kernel/syscall.c
++++ b/arch/mips/kernel/syscall.c
+@@ -383,12 +383,11 @@ save_static_function(sys_sysmips);
+ static int __used noinline
+ _sys_sysmips(nabi_no_regargs struct pt_regs regs)
+ {
+-	long cmd, arg1, arg2, arg3;
++	long cmd, arg1, arg2;
+ 
+ 	cmd = regs.regs[4];
+ 	arg1 = regs.regs[5];
+ 	arg2 = regs.regs[6];
+-	arg3 = regs.regs[7];
+ 
+ 	switch (cmd) {
+ 	case MIPS_ATOMIC_SET:
+diff --git a/arch/mips/math-emu/ieee754int.h b/arch/mips/math-emu/ieee754int.h
+index 1a846c5..9f867cd 100644
+--- a/arch/mips/math-emu/ieee754int.h
++++ b/arch/mips/math-emu/ieee754int.h
+@@ -71,7 +71,7 @@
+ 
+ 
+ #define COMPXSP \
+-  unsigned xm; int xe; int xs; int xc
++  unsigned xm; int xe; int xs __maybe_unused; int xc
+ 
+ #define COMPYSP \
+   unsigned ym; int ye; int ys; int yc
+@@ -105,7 +105,7 @@
+ 
+ 
+ #define COMPXDP \
+-u64 xm; int xe; int xs; int xc
++u64 xm; int xe; int xs __maybe_unused; int xc
+ 
+ #define COMPYDP \
+ u64 ym; int ye; int ys; int yc
+diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
+index 6721ee2..8b24bcd 100644
+--- a/arch/mips/mm/c-r4k.c
++++ b/arch/mips/mm/c-r4k.c
+@@ -1076,7 +1076,6 @@ static int __cpuinit probe_scache(void)
+ 	unsigned long flags, addr, begin, end, pow2;
+ 	unsigned int config = read_c0_config();
+ 	struct cpuinfo_mips *c = &current_cpu_data;
+-	int tmp;
+ 
+ 	if (config & CONF_SC)
+ 		return 0;
+@@ -1109,7 +1108,6 @@ static int __cpuinit probe_scache(void)
+ 
+ 	/* Now search for the wrap around point. */
+ 	pow2 = (128 * 1024);
+-	tmp = 0;
+ 	for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
+ 		cache_op(Index_Load_Tag_SD, addr);
+ 		__asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
+diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
+index 2efcbd2..279599e 100644
+--- a/arch/mips/mm/init.c
++++ b/arch/mips/mm/init.c
+@@ -324,7 +324,7 @@ int page_is_ram(unsigned long pagenr)
+ void __init paging_init(void)
+ {
+ 	unsigned long max_zone_pfns[MAX_NR_ZONES];
+-	unsigned long lastpfn;
++	unsigned long lastpfn __maybe_unused;
+ 
+ 	pagetable_init();
+ 
diff --git a/recipes-kernel/linux/linux-jlime-ben-nanonote_2.6.36.bb b/recipes-kernel/linux/linux-jlime-ben-nanonote_2.6.36.bb
index 3df3f63..c2c1ade 100644
--- a/recipes-kernel/linux/linux-jlime-ben-nanonote_2.6.36.bb
+++ b/recipes-kernel/linux/linux-jlime-ben-nanonote_2.6.36.bb
@@ -1,6 +1,7 @@
 DESCRIPTION = "Linux 2.6.36 kernel for the Ben Nanonote"
 SECTION = "kernel"
 LICENSE = "GPLv2"
+LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"
 
 DEPENDS += "u-boot-mkimage-native"
 
@@ -15,7 +16,9 @@ SRC_URI = "git://git.kernel.org/pub/scm/linux/kernel/git/kristoffer/linux-hpc.gi
 	   file://logo_linux_clut224.tar.gz \
 	   file://modifier-keys.patch \
 	   file://config-ben-nanonote \
-	   file://jz4740-udc.patch"
+	   file://jz4740-udc.patch \
+	   file://fix-gcc-4.6.0-build-errors.patch \
+	   "
 
 S = "${WORKDIR}/git"