This includes the following changes related to sparc for v7.2:

- Align sparc to other archs by providing ucontext.h wrapper
 
 - Fix buffer underflow in led driver
 
 - Export mcount for clang and disable compat when using lld for linking
 
 - API choice improvement for sysfs code for vio
 
 - Fix build warnings and notification of missing prototype
 
 - Remove dead code and dead configs
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Merge tag 'sparc-for-7.2-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/alarsson/linux-sparc

Pull sparc updates from Andreas Larsson:

 - Align sparc to other archs by providing ucontext.h wrapper

 - Fix buffer underflow in led driver

 - Export mcount for clang and disable compat when using lld for linking

 - API choice improvement for sysfs code for vio

 - Fix build warnings and notification of missing prototype

 - Remove dead code and dead configs

* tag 'sparc-for-7.2-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/alarsson/linux-sparc:
  sparc: Remove remaining defconfig references to the pktcdvd driver
  sparc: led: avoid trimming a newline from empty writes
  sparc: Export mcount for Clang-built modules
  sparc: Disable compat support with LLD
  sparc: Avoid -Wunused-but-set-parameter in clear_user_page()
  sparc: add _mcount() prototype
  sparc64: uprobes: add missing break
  sparc: remove unused SERIAL_CONSOLE config option
  sparc32: remove deadwood swift_flush_tlb_page() debug code
  sparc: uapi: Add ucontext.h
  sparc: vio: use sysfs_emit in sysfs show functions

arch/sparc/Kconfig

@@ -326,30 +326,6 @@ config SPARC_LED
 	  by reading /proc/led and its blinking mode can be changed
 	  via writes to /proc/led
 
-config SERIAL_CONSOLE
-	bool
-	depends on SPARC32
-	default y
-	help
-	  If you say Y here, it will be possible to use a serial port as the
-	  system console (the system console is the device which receives all
-	  kernel messages and warnings and which allows logins in single user
-	  mode). This could be useful if some terminal or printer is connected
-	  to that serial port.
-
-	  Even if you say Y here, the currently visible virtual console
-	  (/dev/tty0) will still be used as the system console by default, but
-	  you can alter that using a kernel command line option such as
-	  "console=ttyS1". (Try "man bootparam" or see the documentation of
-	  your boot loader (silo) about how to pass options to the kernel at
-	  boot time.)
-
-	  If you don't have a graphics card installed and you say Y here, the
-	  kernel will automatically use the first serial line, /dev/ttyS0, as
-	  system console.
-
-	  If unsure, say N.
-
 config SPARC_LEON
 	bool "Sparc Leon processor family"
 	depends on SPARC32
@@ -473,6 +449,7 @@ endmenu
 config COMPAT
 	bool
 	depends on SPARC64
+	depends on !LD_IS_LLD
 	default y
 	select HAVE_UID16
 	select ARCH_WANT_OLD_COMPAT_IPC

arch/sparc/configs/sparc64_defconfig

@@ -60,8 +60,6 @@ CONFIG_CONNECTOR=m
 CONFIG_BLK_DEV_LOOP=m
 CONFIG_BLK_DEV_CRYPTOLOOP=m
 CONFIG_BLK_DEV_NBD=m
-CONFIG_CDROM_PKTCDVD=m
-CONFIG_CDROM_PKTCDVD_WCACHE=y
 CONFIG_ATA_OVER_ETH=m
 CONFIG_SUNVDC=m
 CONFIG_ATA=y

arch/sparc/include/asm/asm-prototypes.h

@@ -25,6 +25,8 @@ void *memcpy(void *dest, const void *src, size_t n);
 void *memset(void *s, int c, size_t n);
 typedef int TItype __attribute__((mode(TI)));
 TItype __multi3(TItype a, TItype b);
+void _mcount(void);
+void mcount(void);
 
 s64 __ashldi3(s64, int);
 s64 __lshrdi3(s64, int);

arch/sparc/include/asm/page_32.h

@@ -20,10 +20,12 @@
 #define clear_user_page(addr, vaddr, page)	\
 	do { 	clear_page(addr);		\
 		sparc_flush_page_to_ram(page);	\
+		(void)(vaddr);			\
 	} while (0)
 #define copy_user_page(to, from, vaddr, page)	\
 	do {	copy_page(to, from);		\
 		sparc_flush_page_to_ram(page);	\
+		(void)(vaddr);			\
 	} while (0)
 
 /* The following structure is used to hold the physical

arch/sparc/include/uapi/asm/ucontext.h

@@ -0,0 +1,3 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+
+#include <asm/uctx.h>

arch/sparc/kernel/led.c

@@ -78,7 +78,7 @@ static ssize_t led_proc_write(struct file *file, const char __user *buffer,
 		return PTR_ERR(buf);
 
 	/* work around \n when echo'ing into proc */
-	if (buf[count - 1] == '\n')
+	if (count > 0 && buf[count - 1] == '\n')
 		buf[count - 1] = '\0';
 
 	/* before we change anything we want to stop any running timers,

arch/sparc/kernel/uprobes.c

@@ -280,6 +280,7 @@ int arch_uprobe_exception_notify(struct notifier_block *self,
 	case DIE_SSTEP:
 		if (uprobe_post_sstep_notifier(args->regs))
 			ret = NOTIFY_STOP;
+		break;
 
 	default:
 		break;

arch/sparc/kernel/vio.c

@@ -13,6 +13,7 @@
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/string.h>
+#include <linux/sysfs.h>
 #include <linux/irq.h>
 #include <linux/export.h>
 #include <linux/init.h>
@@ -121,7 +122,7 @@ static ssize_t devspec_show(struct device *dev,
 	else if (!strcmp(vdev->type, "vdc-port"))
 		str = "vdisk";
 
-	return sprintf(buf, "%s\n", str);
+	return sysfs_emit(buf, "%s\n", str);
 }
 static DEVICE_ATTR_RO(devspec);
 
@@ -129,7 +130,7 @@ static ssize_t type_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
 	struct vio_dev *vdev = to_vio_dev(dev);
-	return sprintf(buf, "%s\n", vdev->type);
+	return sysfs_emit(buf, "%s\n", vdev->type);
 }
 static DEVICE_ATTR_RO(type);
 
@@ -138,7 +139,7 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
 {
 	const struct vio_dev *vdev = to_vio_dev(dev);
 
-	return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat);
+	return sysfs_emit(buf, "vio:T%sS%s\n", vdev->type, vdev->compat);
 }
 static DEVICE_ATTR_RO(modalias);
 
@@ -192,7 +193,7 @@ show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
 	vdev = to_vio_dev(dev);
 	dp = vdev->dp;
 
-	return scnprintf(buf, PAGE_SIZE, "%pOF\n", dp);
+	return sysfs_emit(buf, "%pOF\n", dp);
 }
 
 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,

arch/sparc/lib/mcount.S

@@ -21,6 +21,7 @@
 	EXPORT_SYMBOL(_mcount)
 	.globl		mcount
 	.type		mcount,#function
+	EXPORT_SYMBOL(mcount)
 _mcount:
 mcount:
 #ifdef CONFIG_FUNCTION_TRACER

arch/sparc/mm/srmmu.c

@@ -581,35 +581,6 @@ extern void swift_flush_tlb_range(struct vm_area_struct *vma,
 				  unsigned long start, unsigned long end);
 extern void swift_flush_tlb_page(struct vm_area_struct *vma, unsigned long page);
 
-#if 0  /* P3: deadwood to debug precise flushes on Swift. */
-void swift_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
-{
-	int cctx, ctx1;
-
-	page &= PAGE_MASK;
-	if ((ctx1 = vma->vm_mm->context) != -1) {
-		cctx = srmmu_get_context();
-/* Is context # ever different from current context? P3 */
-		if (cctx != ctx1) {
-			printk("flush ctx %02x curr %02x\n", ctx1, cctx);
-			srmmu_set_context(ctx1);
-			swift_flush_page(page);
-			__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
-					"r" (page), "i" (ASI_M_FLUSH_PROBE));
-			srmmu_set_context(cctx);
-		} else {
-			 /* Rm. prot. bits from virt. c. */
-			/* swift_flush_cache_all(); */
-			/* swift_flush_cache_page(vma, page); */
-			swift_flush_page(page);
-
-			__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
-				"r" (page), "i" (ASI_M_FLUSH_PROBE));
-			/* same as above: srmmu_flush_tlb_page() */
-		}
-	}
-}
-#endif
 
 /*
  * The following are all MBUS based SRMMU modules, and therefore could