Merge tag 'powerpc-4.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman:
 "Notable changes:

   - Support for split PMD page table lock on 64-bit Book3S (Power8/9).

   - Add support for HAVE_RELIABLE_STACKTRACE, so we properly support
     live patching again.

   - Add support for patching barrier_nospec in copy_from_user() and
     syscall entry.

   - A couple of fixes for our data breakpoints on Book3S.

   - A series from Nick optimising TLB/mm handling with the Radix MMU.

   - Numerous small cleanups to squash sparse/gcc warnings from Mathieu
     Malaterre.

   - Several series optimising various parts of the 32-bit code from
     Christophe Leroy.

   - Removal of support for two old machines, "SBC834xE" and "C2K"
     ("GEFanuc,C2K"), which is why the diffstat has so many deletions.

  And many other small improvements & fixes.

  There's a few out-of-area changes. Some minor ftrace changes OK'ed by
  Steve, and a fix to our powernv cpuidle driver. Then there's a series
  touching mm, x86 and fs/proc/task_mmu.c, which cleans up some details
  around pkey support. It was ack'ed/reviewed by Ingo & Dave and has
  been in next for several weeks.

  Thanks to: Akshay Adiga, Alastair D'Silva, Alexey Kardashevskiy, Al
  Viro, Andrew Donnellan, Aneesh Kumar K.V, Anju T Sudhakar, Arnd
  Bergmann, Balbir Singh, Cédric Le Goater, Christophe Leroy, Christophe
  Lombard, Colin Ian King, Dave Hansen, Fabio Estevam, Finn Thain,
  Frederic Barrat, Gautham R. Shenoy, Haren Myneni, Hari Bathini, Ingo
  Molnar, Jonathan Neuschäfer, Josh Poimboeuf, Kamalesh Babulal,
  Madhavan Srinivasan, Mahesh Salgaonkar, Mark Greer, Mathieu Malaterre,
  Matthew Wilcox, Michael Neuling, Michal Suchanek, Naveen N. Rao,
  Nicholas Piggin, Nicolai Stange, Olof Johansson, Paul Gortmaker, Paul
  Mackerras, Peter Rosin, Pridhiviraj Paidipeddi, Ram Pai, Rashmica
  Gupta, Ravi Bangoria, Russell Currey, Sam Bobroff, Samuel
  Mendoza-Jonas, Segher Boessenkool, Shilpasri G Bhat, Simon Guo,
  Souptick Joarder, Stewart Smith, Thiago Jung Bauermann, Torsten Duwe,
  Vaibhav Jain, Wei Yongjun, Wolfram Sang, Yisheng Xie, YueHaibing"

* tag 'powerpc-4.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (251 commits)
  powerpc/64s/radix: Fix missing ptesync in flush_cache_vmap
  cpuidle: powernv: Fix promotion from snooze if next state disabled
  powerpc: fix build failure by disabling attribute-alias warning in pci_32
  ocxl: Fix missing unlock on error in afu_ioctl_enable_p9_wait()
  powerpc-opal: fix spelling mistake "Uniterrupted" -> "Uninterrupted"
  powerpc: fix spelling mistake: "Usupported" -> "Unsupported"
  powerpc/pkeys: Detach execute_only key on !PROT_EXEC
  powerpc/powernv: copy/paste - Mask SO bit in CR
  powerpc: Remove core support for Marvell mv64x60 hostbridges
  powerpc/boot: Remove core support for Marvell mv64x60 hostbridges
  powerpc/boot: Remove support for Marvell mv64x60 i2c controller
  powerpc/boot: Remove support for Marvell MPSC serial controller
  powerpc/embedded6xx: Remove C2K board support
  powerpc/lib: optimise PPC32 memcmp
  powerpc/lib: optimise 32 bits __clear_user()
  powerpc/time: inline arch_vtime_task_switch()
  powerpc/Makefile: set -mcpu=860 flag for the 8xx
  powerpc: Implement csum_ipv6_magic in assembly
  powerpc/32: Optimise __csum_partial()
  powerpc/lib: Adjust .balign inside string functions for PPC32
  ...

1 files changed, 37 insertions, 24 deletions

diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 492f03451877..5eedbb282d42 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -25,9 +25,10 @@
 #include <linux/errno.h>
 #include <linux/elf.h>
 #include <linux/ptrace.h>
+#include <linux/pagemap.h>
 #include <linux/ratelimit.h>
-#ifdef CONFIG_PPC64
 #include <linux/syscalls.h>
+#ifdef CONFIG_PPC64
 #include <linux/compat.h>
 #else
 #include <linux/wait.h>
@@ -57,10 +58,6 @@
 
 
 #ifdef CONFIG_PPC64
-#define sys_rt_sigreturn	compat_sys_rt_sigreturn
-#define sys_swapcontext	compat_sys_swapcontext
-#define sys_sigreturn	compat_sys_sigreturn
-
 #define old_sigaction	old_sigaction32
 #define sigcontext	sigcontext32
 #define mcontext	mcontext32
@@ -1041,11 +1038,18 @@ static int do_setcontext_tm(struct ucontext __user *ucp,
 }
 #endif
 
-long sys_swapcontext(struct ucontext __user *old_ctx,
-		     struct ucontext __user *new_ctx,
-		     int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpragmas"
+#pragma GCC diagnostic ignored "-Wattribute-alias"
+#ifdef CONFIG_PPC64
+COMPAT_SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
+		       struct ucontext __user *, new_ctx, int, ctx_size)
+#else
+SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
+		       struct ucontext __user *, new_ctx, long, ctx_size)
+#endif
 {
-	unsigned char tmp __maybe_unused;
+	struct pt_regs *regs = current_pt_regs();
 	int ctx_has_vsx_region = 0;
 
 #ifdef CONFIG_PPC64
@@ -1109,9 +1113,8 @@ long sys_swapcontext(struct ucontext __user *old_ctx,
 	}
 	if (new_ctx == NULL)
 		return 0;
-	if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
-	    || __get_user(tmp, (u8 __user *) new_ctx)
-	    || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
+	if (!access_ok(VERIFY_READ, new_ctx, ctx_size) ||
+	    fault_in_pages_readable((u8 __user *)new_ctx, ctx_size))
 		return -EFAULT;
 
 	/*
@@ -1131,11 +1134,16 @@ long sys_swapcontext(struct ucontext __user *old_ctx,
 	set_thread_flag(TIF_RESTOREALL);
 	return 0;
 }
+#pragma GCC diagnostic pop
 
-long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
-		     struct pt_regs *regs)
+#ifdef CONFIG_PPC64
+COMPAT_SYSCALL_DEFINE0(rt_sigreturn)
+#else
+SYSCALL_DEFINE0(rt_sigreturn)
+#endif
 {
 	struct rt_sigframe __user *rt_sf;
+	struct pt_regs *regs = current_pt_regs();
 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 	struct ucontext __user *uc_transact;
 	unsigned long msr_hi;
@@ -1223,15 +1231,16 @@ long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
 	return 0;
 }
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpragmas"
+#pragma GCC diagnostic ignored "-Wattribute-alias"
 #ifdef CONFIG_PPC32
-int sys_debug_setcontext(struct ucontext __user *ctx,
-			 int ndbg, struct sig_dbg_op __user *dbg,
-			 int r6, int r7, int r8,
-			 struct pt_regs *regs)
+SYSCALL_DEFINE3(debug_setcontext, struct ucontext __user *, ctx,
+			 int, ndbg, struct sig_dbg_op __user *, dbg)
 {
+	struct pt_regs *regs = current_pt_regs();
 	struct sig_dbg_op op;
 	int i;
-	unsigned char tmp __maybe_unused;
 	unsigned long new_msr = regs->msr;
 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
 	unsigned long new_dbcr0 = current->thread.debug.dbcr0;
@@ -1287,9 +1296,8 @@ int sys_debug_setcontext(struct ucontext __user *ctx,
 	current->thread.debug.dbcr0 = new_dbcr0;
 #endif
 
-	if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
-	    || __get_user(tmp, (u8 __user *) ctx)
-	    || __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
+	if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)) ||
+	    fault_in_pages_readable((u8 __user *)ctx, sizeof(*ctx)))
 		return -EFAULT;
 
 	/*
@@ -1329,6 +1337,7 @@ int sys_debug_setcontext(struct ucontext __user *ctx,
 	return 0;
 }
 #endif
+#pragma GCC diagnostic pop
 
 /*
  * OK, we're invoking a handler
@@ -1419,9 +1428,13 @@ badframe:
 /*
  * Do a signal return; undo the signal stack.
  */
-long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
-		       struct pt_regs *regs)
+#ifdef CONFIG_PPC64
+COMPAT_SYSCALL_DEFINE0(sigreturn)
+#else
+SYSCALL_DEFINE0(sigreturn)
+#endif
 {
+	struct pt_regs *regs = current_pt_regs();
 	struct sigframe __user *sf;
 	struct sigcontext __user *sc;
 	struct sigcontext sigctx;